The invention refers to a modular set for reali zing a luminaire as well as to a luminaire reali zed by such set as well as to a method for reali zing a luminaire .

A modular set for reali zing a luminaire to which the preamble of claim 1 and accordingly the invention refers comprises a tubular housing extending along its tube axis over a length in a longitudinal direction, a gear tray, a light module and at least two end caps . Such modular set is configured for reali zing a luminaire by arranging the gear tray with the light module fixed to the gear tray inside the tubular housing and by closing the tubular housing at its longitudinal ends by said two end caps . The tubular housing commonly has a length in the longitudinal direction which amounts to at least twice , in particular at least five times of its length in any direction being perpendicular to the longitudinal direction . Preferably, the same is true for the gear tray . The longitudinal direction is the direction which is parallel to the tube axis of the tubular housing . As the tubular housing is designed like a tube , it encloses an interior space with its inner side all around the tube axis . The tubular housing may be formed of one piece or of several pieces , but in any case is tube-like formed thereby surrounding the interior space around the tube axis . The tubular housing being formed like a tube accordingly is open at its longitudinal ends , such that the gear tray with the light module can easily be installed inside the tubular housing and can be connected by power lines extending from the interior space to the outside of the tubular housing, i . e . to the surroundings of the tubular housing . Such modular set is appropriate for easy manufacturing a luminaire which has a sealed interior space . Such interior space of the luminaire is defined by the mentioned inner side of the tubular housing as well as the end caps , i . e . the inner side of the end caps which in the luminaire are situated adj acent to the inner side of the tubular housing, such that the inner side of the tubular housing and the inner sides of the end caps together enclose the interior space . The sealing connection of the end caps to the tubular housing is a connection which inhibits entrance of undesired medium into the interior space . E . g . , the sealing may refer to a sealing as defined by IP-codes defined in IEC60529 . In the present application, the definition of sealed connection, respectively sealed interior space refers to a sealing at least according to IP20 , in particular at least according to IP50 , in particular at least according to IP54 , in particular at least according to IP66 , wherein in particularly advantageous embodiments it may also refer to a gas tight sealing such that N2 gas surrounding entirely the luminaire reali zed by the set cannot enter the interior space through the tubular housing, respectively the end caps , respectively the connection between the tubular housing and the end caps provided that the interior space of the luminaire is filled with air under the same pressure under which the N2 gas is arranged all around the luminaire . When a luminaire is reali zed by such modular set , the components of the modular set are arranged relative to each other, in particular fixed to each other, in a determined manner, such that the set with the particular arrangement of its components is in a particular operating state which refers to the particular arrangement of the components of the sets . Commonly the gear tray comprises a mounting panel with a top side and a bottom side , wherein, in any operating state of the set , the gear tray is arranged within the interior space of the luminaire , the light module being attached to the bottom side of the mounting panel . Top and bottom sides refer to sides being directed along the vertical direction, such that top and bottom side provide opposite vertical ends , wherein the vertical direction is perpendicular to the longitudinal direction . In any operating state , the light module being attached to the bottom side of the mounting panel is configured to emit light , wherein this light emanating from the light module is emitted to surroundings of the luminaire from the tubular housing with a light intensity . Accordingly, in any operating state , the light intensity to which is referred is the overall light intensity emanating from the light module and emitted by the tubular housing surrounding the interior space as illustrated above , i . e . the intensity of light which is emitted by the outer surface of the tubular housing . Preferably, apart from commonly negligible losses of light inside the tubular housing, all of the light emitted by the light module is emitted to the surroundings of the luminaire by the tubular housing .

Known modular sets in principle are appropriate for reali zing a luminaire . However, there is a strong need for providing luminaires which can be adapted easily to the speci fic requirements of speci fic fields of application and which can be reali zed cost-ef f iciently and with appropriate features for the respective field of application . Such field of application can be, e.g., illumination of offices, floors, factory buildings or shops. Since each field of application has quite different requirements concerning the desired illumination, commonly known sets comprise a large variety of different housings, different gear trays, different light modules and different optical elements to be arranged around the light module such that for each application a choice is made between the plurality of different components, and combination of these components is made for realizing a luminaire. This, however, results on the one hand in high manufacturing costs and on the other hand makes it necessary for companies to buy different types of luminaires varying remarkably in their properties, in particular in their design and functional elements. This leads to high costs for the installation and maintenance of illumination means in companies and in addition inevitably results in a potpourri of luminaires throughout the entire company which is disadvantageous in various regards, in particular with regard to a common optical design throughout the company and a common technical equipment throughout the company for simplifying maintenance.

Accordingly, the present invention faces the objective technical problem to provide a modular set for realizing a luminaire, respectively a luminaire, respectively a method for realizing a luminaire which addresses at least partially at least one of the above-mentioned disadvantages of common modular sets.

As one solution of the above-mentioned objective technical problem the present invention proposes a modular set with the features of claim 1. A modular set according to the invention comprises a plurality of components which may be arranged in a particular manner which corresponds to a particular operating state of the modular set in which a luminaire is reali zed . The set comprises as components at least a tubular housing extending along its tube axis over a length in a longitudinal direction, a gear tray having a mounting panel with a top side and a bottom side , a light module and at least two end caps . In further embodiments of the invention, the modular set may also comprise further components as described below . The modular set may also in some embodiments of the invention may comprise features which are described above with regard to the known modular sets to which the invention refers . In one operating state of the set , in which the luminaire is reali zed, each of the end caps is detachably and sealingly fixed to the tubular housing closing at the longitudinal end of the tubular housing associated to the respective end cap . Further, in the operating state of the set , the gear tray is arranged within an interior space of the luminaire defined by an inner side of the tubular housing and the end caps . Further, in the operating state , the light module is attached to the bottom side of the mounting panel of the gear tray, wherein in the operating state light emanating from the light module is emitted to surroundings of the luminaire from the tubular housing with a light intensity . Since the light module is attached to the bottom side of the mounting panel of the gear tray in the operating state , the light module in the operating state is configured to emit light vertically downwards , in particular exclusively vertically downwards , wherein in particular the main emission direction of the light module has an angle of less than 20 ° , in particular less than 10 ° with regard to the vertical direction . Generally, in the present application the indication of downwards as well as the indication of upwards both mean a direction having at least a component of direction which is parallel to the vertical direction, i . e . a vertical component , wherein any direction presently referred to as downwards as a vertical component having the opposite sign of the vertical component of any direction referred to as upwards , such that e . g . a downwards direction always has a vertical component with a negative sign and an upwards direction always has a vertical component with a positive sign, such that these components point to opposite directions along the vertical direction . Accordingly, the luminaire reali zed in the operating state of the modular set generally is configured to be mounted to a ceiling facing the sealing with its topside and providing direct illumination of a room having this sealing with light emanating from the light module being emitted downwards from the tubular housing . According to the invention, the tubular housing comprises a fixing means at its inner side , wherein in the operating state the gear tray is fixed to the fixing means of the tubular housing such that the bottom side of the mounting panel of the gear tray is arranged at a vertical distance from a bottom end of the inner side of the tubular housing . Of course , the bottom side of the mounting panel of the gear tray faces the bottom end of the inner side of the tubular housing . As the tubular housing with its inner side defines the interior space , the inner side of the tubular housing has a bottom end and a top end between which the interior space extends within the tubular housing, i . e . top end and bottom end of the inner side of the tubular housing define the vertical extension of the interior space within the tubular housing . In some embodiments , in the operating state the gear tray is fixed to the fixing means such that the bottom side of its mounting panel is arranged at a vertical distance from the bottom end of the inner side which amounts to at least 30 % of the maximum vertical extension of the interior space within the tubular housing, in particular to at least 40 % , in particular to at least 50 % of the maximum vertical extension of the interior space within the tubular housing . The tubular housing comprises a bottom optical section being arranged below the fixing means and forming said bottom end of the inner side of the tubular housing . In the operating state , the bottom optical section of the tubular housing surrounds at least partially the bottom side of the mounting panel . Accordingly, light emitted by the luminaire in the operating state to provide direct illumination is emitted by the bottom optical section of the tubular housing to the surroundings of the luminaire , i . e . to the outside of the luminaire , respectively the tubular housing . Since the bottom optical section surrounds at least partially the bottom side of the mounting panel , its inner side surrounds at least partially the light module , wherein the light emanating from the light module and emitted to the surroundings of the luminaire in the operating state is emitted by the outer surface of the bottom optical section of the tubular housing, the outer side , respectively outer surface of the bottom optical section facing a way from the light module , such that any light emanating from the light module and being emitted to the outside by the bottom optical section must traverse the bottom optical section such that the bottom optical section influences the propagation direction of the light emanating from the light module before it is emitted by the outer side of the bottom optical section to the surroundings . The propagation direction of the light is influenced according to the shape of the bottom optical section which a skilled person chooses appropriately to provide a desired light distribution . E . g . , light may be refracted when entering the bottom optical section at its inner side and when exiting the bottom optical section at its outer side and/or light may at least partially be reflected by internal reflection within the bottom optical section . The shape of the surface of the bottom optical section is chosen to provide the desired influence on the propagation direction of the light , e . g . a prismatic structure and/or any other appropriate lens structure or curved surface section at the inner and/or outer side of the bottom optical section may be provided . The feature defining that the bottom optical section surrounds the bottom side of the mounting panel at least partially at least requires that the bottom optical section which provides the bottom end of the inner side of the tubular housing extends , starting from said bottom end, upwards towards the bottom side of the mounting panel , in particular by its sidewall portions defined later, such that the bottom optical portion is not j ust a plane portion extending perpendicular to the vertical direction but has a vertical extension such that it has portions which, in the vertical direction, are closer to the bottom side of the mounting panel that said bottom end . Preferably, the bottom optical section has two side wall portions extending in the vertical direction towards the mounting panels and being spaced apart from each other in a transverse direction, which is perpendicular to the vertical direction, by a bottom portion of the bottom optical section, wherein with regard to the transverse direction the mounting panel is arranged between said sidewall portions . The bottom optical section is arranged below the fixing means , in particular extends only below the fixing means . In one embodiment , the bottom optical section being arranged below the fixing means and comprising the bottom end of the inner side of the tubular housing being arranged at a determined vertical distance from the bottom side of the mounting panel and at least partially surrounding said bottom side of the mounting panel is configured to emit at least 5 % , in particular at least 10 % , in particular at least 15 % , in particular at least 20 % of the light intensity upwards and at least 70 % , in particular at least 75 % , in particular at least 80 % of the light intensity downwards . Accordingly, the luminaire reali zed in the operating state is configured to provide both direct and indirect illumination, since , when mounted to a ceiling of a room, the light emitted downwards provides direct illumination and the light emitted upwards provides indirect illumination . This light emitted upwards typically is emitted to the ceiling or any other appropriate element of the room in which the luminaire is installed, and this ceiling, respectively other element being illuminated by this light serves for illumination of the room which is referred to as indirect illumination . In one embodiment , the tubular housing comprises a top section and the bottom optical section, the top section and the bottom optical section together closely surround the tube axis . Accordingly, a cross-section of the tubular housing, referring to a cross-section perpendicular to the longitudinal direction and accordingly perpendicular to the tube axis , is formed by the top section and the bottom optical section, in particular over at least 70 % , in particular at least 80 % , in particular at least 90 % of the length of the tubular housing, in particular over the entire illumination length of the tubular housing, wherein in the operating state the tubular housing only within its illumination length is configured to emit light to its surroundings . Top section and bottom optical section accordingly together surround the tube axis preferably without any gap, accordingly closely . Preferably, the top section is formed of another material than the bottom optical section . In one embodiment , the bottom optical section throughout its entire extension is formed of light transmissive material , e . g . transparent or translucent material , whereas the top section is formed of nontransparent material or at least material having di f ferent optical properties than the one out of which the bottom optical section is formed . The materials out of which top section and bottom optical section are formed may, e . g . di f fer from each other with regard to the sti f fness and/or with regard to the light di f fusive properties . In one embodiment , the bottom optical section is at least twice , in particular at least three times as large as the top section . By being at least twice as large as the top section, the bottom optical section has a surface at its inner side which is at least twice as large as the surface of the top section at its inner side , such that the inner side of the tubular housing defining the interior space of the luminaire in the operating state is formed to at least two third by the bottom optical section and to not more than one third by the top section . In one embodiment , the gear tray comprises or consist of a first section having a U-shaped cross-section including a bottom portion and two flank portions , wherein the mounting panel is formed by the bottom portion, the top side of the bottom portion being the top side of the mounting panel being framed by the flank portions and the bottom side of the bottom portion being the bottom side of the mounting panel facing away from the flank portions , wherein in particular the flank portions with their outer sides facing away from the bottom portion of the gear tray are facing the inner side of the tubular housing, in particular of the bottom optical section, and are configured being reflective at their outer sides , wherein in particular at least 2 % of the light emitted by the bottom optical section to the surroundings in the operating state has been reflected at the outer sides of the flank portions of the gear tray before being emitted by the tubular housing to the surroundings .

Due to its modular setup and due to the arrangement of the bottom side of the mounting panel of the gear tray with the light module being surrounded at least partially by the bottom optical section of the tubular housing, the modular set provides a basis for the reali zation of luminaries which are adapted to various technical fields . Due to the vertical distance provided between the bottom side of the mounting panel and the bottom end of the inner side of the tubular housing, there is enough space for directing light over a suf ficiently large distribution angle . Accordingly, the luminaire reali zed by the set in its operating state can provide direct and indirect illumination, wherein the amount of direct and indirect illumination, respectively, can be set by providing a respective geometric shape of the tubular housing within the bottom optical section as well as , preferably, by providing additional optical elements between the light module and the bottom end of the inner side of the bottom optical section . Further, since the fixing means is provided at the inner side of the tubular housing and since the bottom optical section is arranged below the fixing means , the fixing means by which the gear tray is held within the tubular housing does not impede the light propagation from the light module to the bottom optical section of the tubular housing . Further, by making the tubular housing at least along a signi ficant share of its longitudinal length consisting of a top section and a bottom optical portion, determined properties of the tubular housing can be obtained, in particular within the above- mentioned illumination length . Further, by providing a bottom optical section which is signi ficantly larger than the top section of the tubular housing, the tubular housing allows emitting of light emanating from the light module throughout a large share of its outer surface . In one embodiment , the tubular housing comprises a mounting device by which it can be mounted to a sealing, wherein these mount means are exclusively provided by the top section of the tubular housing . Such mounting device , e . g . , may comprise recesses or proj ections provided at the outer side of the top section and/or hooks or clamps which, in the operating state , are provided at the top side of the top section which corresponds to the top side of the tubular housing . In particular, the design of the bottom optical section combined with its arrangement relative to the light module in the operating state of the set which provides emission of light with a remarkable share of intensity upwards as well as with a remarkable , but even higher share of the intensity downwards has been reali zed to be particularly advantageous for a large plurality of applications .

In one embodiment , the modular set comprises a mounting element having a first mounting section corresponding with the fixing means of the tubular housing as well as a second mounting section corresponding with the gear tray . In the operating state , the mounting element is fixed with its first mounting section to the tubular housing and is fixed with its second mounting section to the gear tray thereby fixing the gear tray to the tubular housing . Preferably, in the operating state the mounting element fixes the gear tray releasably to the tubular housing, such that the tubular housing element can be detached from the fixing means or detached from the gear tray, starting from the operating state , such that after releasing the fixation of the gear tray from the tubular housing by the fixing means the gear tray can be removed from the housing . Preferably, the fixing means in the operating state is releasably fixed with it first mounting section to the tubular housing . Preferably, in the operating state , the mounting element is fixed releasably with its second mounting section to the gear tray . Preferably, the mounting element is a separate element which can be releasably fixed to both the gear tray and a fixing means for reali zing the operating state . Generally, in the present application the definition of releasably or detachably fixed means a fixation which subsequently can be reali zed and released several times without damages . In one embodiment , the first mounting section, in the operating state , is spaced apart vertically from the bottom side of the mounting panel of the gear tray fixed to the second mounting section, in particular by at least 1 / 5 , in particular by at least 1 / 4 of a maximum vertical extension of the interior space . Preferably, at least a part of the second mounting section is configured to be fixed directly to the mounting panel of the gear tray thereby providing fixation of the mounting panel of the gear tray to the mounting element , wherein preferably the first mounting section is spaced apart vertically from this part of the second mounting section by at least 1 / 5 , in particular by at least 1 / 4 of a maximum vertical extension of the interior space . Said part of the second mounting section is configured to provide all alone suf ficient fixation of the mounting panel of the gear tray to the mounting element , while of course the second mounting section might comprise further parts which are configured to fix at least one further component of the gear tray which the gear tray comprises in addition to the mounting panel . The interior space , throughout its length along the longitudinal direction of course has a vertical extension, and the maximum vertical extension is the largest vertical extension throughout the length of the interior space . Preferably, the mounting element , in the operating state , vertically extends along the bottom optical section of the tubular housing, such that the bottom optical section of the tubular housing and the mounting element both extend along a same vertical section over which the interior space extends . Preferably, the mounting element has U-shaped or H-shaped form having two flanks connected by a transverse connection rod, wherein the flanks at their upper ends together from the first mounting section and at their lower ends together from at least a part of the second mounting section, in particular the above-mentioned part of the second mounting section . Being arranged at an end of a flank means arrangement at a distance of less than 20 % , in particular less than 10 % of the entire vertical extension of the flank from an absolute vertical end of the flank . The flanks extend along the vertical direction, such that the flanks provide a vertical distance between first and second mounting sections . The transverse connection rod provides suf ficient sti f fness of the mounting element . The mounting element provides a particularly advantageous modular setup, since by the mounting element the gear tray can be fixed easily and in particular releasably to the inner side of the housing with the mounting panel being vertically spaced apart from the bottom end of the inside of the tubular housing . In particular, the mounting element can be designed to be corresponding with a plurality of components of the set , e . g . corresponding to a first component of the gear tray providing the mounting panel and a second component of the gear tray providing a cable channel section of the gear tray and to a additional gear tray to be mounted vertically spaced apart from the mounting panel above the mounting panel , such that each of the components may be fixed to the tubular housing by the same mounting element . In particular, the set may comprise a plurality of separate mounting elements , each being configured as described with regard to the one mounting element , in particular each being designed identically, wherein at least two , in particular at least three , of the mounting elements of the set , in the operating state , are arranged within the interior space being spaced from each other along the longitudinal direction and both being fixed with their first mounting section to the fixing means of the tubular housing and with their second mounting section to the gear tray . Preferably, the mounting elements are spaced from each other along the longitudinal direction by at least 1 / 10 , in particular at least 1 / 5 , in particular at least 1 / 4 of the length of the tubular housing . In particular, at least two mounting elements are provided within the interior space in the operating state , wherein each of these two mounting elements is associated to one longitudinal end of the tubular housing and is spaced apart from this longitudinal end by a less than 1 / 5 , in particular less than 1 / 10 of the length of the tubular housing . Providing a plurality of separate mounting elements allows easy manufacturing of the mounting elements as well as easy assembling, respectively disassembling, of the luminaire to obtain the operating state , respectively starting from the operating state .

In one embodiment , the bottom optical section extends with its vertical extension from the bottom end of the inner side of the tubular housing at least up to the bottom side of the mounting panel , in particular above the bottom side of the mounting panel , wherein the mounting panel thereby is arranged, in a transverse direction, between two sidewall portions of the bottom optical section which, in the transverse direction, are spaced from each other by a bottom portion of the bottom optical section . As the bottom optical portion extends vertically up to the mounting panel , light can propagate to the bottom optical section within the interior space of the tubular housing throughout a large light distribution angle . This is particularly advantageous for providing a bottom optical section which is configured to emit light emanating from the light module throughout a broad distribution angle , in particular with a remarkable share of light being directed upwards . Preferably, in the operation state , the bottom optical section is configured to emit said light emanating from the light module , i . e . which is emitted with said light intensity from the tubular housing to surroundings , over its entire vertical extension . By emitting light over its entire vertical extension, i . e . throughout its vertical extension, the bottom optical section can provide continuous illumination of the surroundings and further be designed having a continuous appearance in the operating state while light is emanating from the light module . Preferably with regard to any of the embodiments described in the present application, the light module comprises a plurality of LEDs and extends over at least 70 % , in particular at least 80 % of the length of the tubular housing, wherein along a particular line being parallel to the longitudinal direction situated and at the outer side of the tubular housing within the bottom optical section the intensity emitted at each point of the line varies throughout the longitudinal extension of the light module about less than 30 % , in particular less than 20 % , calculated from the maximum intensity along this line . In particular, this is true for any line which can be arranged at the outer side of the tubular housing within its bottom optical section . Of course , said line is an imaginary line which consists of an imaginary sequence of points building said line . In one embodiment , a prismatic structure is provided at each of the sidewall portions of the bottom optical section . Preferably, the prismatic structures of both sidewall portions each form a portion of the inner side of the tubular housing which amounts to at least 20 % , in particular at least 30 % of such entire extension of the inner side of the tubular housing with which, in the operating state , said inner side is arranged below the bottom side of the mounting panel . Of course , the inner side of the tubular housing comprises a portion with which said inner side is arranged below the bottom side of the mounting panel , wherein outside this portion it does not extend below the bottom side of the mounting panel . Preferably, this portion is formed by the bottom optical section . By providing said prismatic structures over a remarkable portion of said portion of the inner side of the tubular housing, said prismatic structures can provide deflection of light emanating from the light module to a remarkable amount and to a remarkable degree in order to provide a suf ficient amount of the intensity emitted from the light module to be directed upwards when being emitted from the tubular housing . Preferably, at least 80 % of the light emitted upwards in the operating state is only emitted after having traversed one of the prismatic structures . Preferably, the prismatic structures both are spaced apart from the bottom end of the inner side of the tubular housing by at least 1 / 10 , in particular at least 1 / 5 , in particular at least 1 / 4 of the maximum vertical extension of the interior space . Preferably, both prismatic structures extend only and throughout the same vertical range .

In one embodiment , the sidewall portions of the bottom optical section each comprise a top wall portion arranged vertically above the bottom side of the mounting panel , wherein at least 5 % of the light intensity emitted upwards by the bottom optical portion is emitted by said top wall portions . Said top wall portions in particular extend vertically only above the bottom side of the mounting panel . In particular, the light intensity emitted upwards by the top wall portions , i . e . the outer side of the tubular housing formed by said top wall portions , is more than 1 % and in particular less than 10 % of the said entire intensity of light emanating from the light module and being emitted by the tubular housing to the surroundings of the luminaire and the operating state . Preferably, the gear tray comprises two sidewalls , each of the sidewalls comprising a reflective surface facing one of the sidewall portions of the bottom optical section in a transverse direction, wherein at least 5 % , in particular at least 10 % , in particular at least 20 % , in particular at least 50 % of the light intensity emitted by the top portions of the sidewall portions of the bottom optical section reaches said sidewall portions only after having being reflected by the sidewalls of the gear tray . Preferably, less than 5 % of the light intensity emitted upwards by the bottom optical portion has been reflected before by the sidewalls of the gear tray . By providing said top wall portions being arranged vertically above the bottom side of the mounting panel and by which a remarkable , but in particular limited amount of light is emitted upwards , said top wall portions on the one hand can contribute to a continuous appearance of the tubular housing and on the other hand can provide for an illumination of a ceiling above the luminaire in the operating state over a large area . Further, it has been discovered to be particularly advantageous to reali ze the sidewalls of the gear tray as being reflective at their outer sides facing the sidewall portions of the bottom optical section, since this again can allow for a continuously shiny appearance of a tubular housing in the operating state . However, as any reflection always goes along with some loss of intensity, it has been found to be particularly advantageous to keep the amount of light being emitted upwards by the bottom optical section having before being reflected by the sidewalls of the gear tray relatively small . In an embodiment in which the gear tray comprises a bottom portion and two flank portions , as e . g . described elsewhere in the present application, the sidewalls of the gear tray may be reali zed by the flank portions .

In one embodiment , the bottom optical section comprises an outer surface by which all of the light emitted by the bottom optical section in the operating state is emitted, as already mentioned above in other contexts . In one embodiment , said outer surface comprises a first surface section and a second surface section, wherein at least 90 % of the light emitted by the bottom optical section downwards is emitted by the first surface section and at least 90 % of the light emitted by the bottom optical section upwards is emitted by the second surface section, wherein the second surface section amounts to at least 50 % , in particular at least 60 % , in particular at least 70 % , in particular at least 90 % , in particular at least 110 % , in particular at least 130 % of the first surface section . In one embodiment , the second surface section extends below the bottom side of the mounting panel with a bottom surface section, the bottom surface section of the second surface section amounting to at least 30 % , in particular to at least 40 % , in particular to at least 50 % , in particular at least 60 % , in particular at least 70 % , in particular at least 80 % , in particular at least 90 % of the first surface section . Providing the second surface section as least as large as the first surface section or even larger, as indicated above , and providing the bottom surface section of at least 60 % or even more , as indicated above , of the first surface section has been found to be especially advantageous . First and second surface section, accordingly, define the surface sections of the outer surface of the tubular housing by which at least most of the light emanating from the light module is emitted . Preferably, all of the light emitted downwards by the bottom optical section is emitted by the first surface section and all of the light emitted upwards by the bottom optical section is emitted by the second surface section . The light intensity emitted upwards by the second surface section is preferably remarkably lower than the light intensity emitted downwards by the first surface section, in particular amounts to less than 80 % , in particular less than 60 % , in particular less than 40 % , in particular less than 35 % of the light intensity emitted downwards by the first surface section . However, the ratio between the first surface section and the second surface section, in particular the bottom surface section of the second surface section, is preferably remarkably lower than the ratio between the intensity of light emitted downwards by the first surface section and the intensity of light emitted upwards by the second surface section, respectively its bottom surface section . This allows a quite unobtrusive indirect illumination by the luminaire in the operating state . Preferably, first and second surface sections are non-overlapping . Preferably, the bottom surface section of the second surface section only extends vertically below the mounting panel of the gear tray in the operating state . The inventors have reali zed that by providing a relatively large surface by which light is emitted upwards and by providing a relatively small surface by which light is emitted downwards , due to the arrangement of the light module at the bottom side of the mounting panel , it is possible to reali ze the above-mentioned share of intensity of light emitted upwards , respectively downwards without too many costintensive optical elements and by providing an unobtrusive shiny appearance of the luminaire .

In one embodiment the set comprises a bottom side optical element being attached, in particular releasable attached, in particular step fitted, to the bottom side of the mounting panel and surrounding the light module such that at least 80 % , in particular at least 90 % of the light emanating from the light module traverses the bottom side optical element before reaching the bottom optical section of the tubular housing in the operating state . Provision of such bottom side optical element allows a high degree of flexibility for reali zing the spatial distribution of light intensity emitted by the luminaire in the operating state . In particular, since the bottom side of the mounting panel is arranged at a vertical distance compared to the bottom end of the inner side of the tubular housing, there is enough place left for arranging said bottom side optical element . Said bottom side optical element may be configured as di f fusor, in particular as di f fusor lens having the property of both di f fusing light and directing light due to its lens characteristics . The bottom side optical element in particular is shaped like a U with the light module being arranged at its open side . Preferably, the light emanating from the light module after having traversed the bottom side optical element has a lower percentage of light being directed upwards before having reached the bottom optical section than after having traversed the bottom optical section, while the light having traversed the bottom optical section of course is emitted by the bottom optical section . Accordingly, the bottom side optical element and the bottom optical section can be configured corresponding to each other and therefore can serve as primary and secondary optical elements which subsequently direct light , such that both the bottom side optical element and the bottom optical section of the tubular housing influence the propagation direction, wherein in particular all of the light which is emitted upwards by the bottom optical section has been directed, i . e . its propagation direction has been changed, by both the bottom side optical element and the bottom optical section . Preferably, the light having traversed the bottom side optical element before reaching the tubular housing has a spatial distribution angle of at least 120 ° around the tube axis . Accordingly, already the bottom side optical element is arranged to serve for a wide spatial distribution of the light emanating from the light module in the operating state , so that light having traversed the bottom side optical element can more easily be directed by the bottom optical section in a way that it is emitted upwards by the bottom optical section .

In one embodiment the set comprises an optical foil which, in the operating state , is attached to the inner side of the bottom optical section of the tubular housing, in particular to its above-mentioned bottom portion . Preferably, at least 70 % , in particular at least 80 % , in particular at least 90 % of the light being emitted by the bottom optical section downwards traverses the optical foil before reaching the tubular housing . Preferably, less than 20 % , in particular less than 10 % , in particular none of the light being emitted by the bottom optical section upwards traverses the optical foil before reaching the tubular housing . Accordingly, the optical foil can be adapted in its optical properties by particularly addressing the needs for direct illumination, i . e . emission downwards from the outer surface of the tubular housing . The optical foil can be designed conveniently, in particular in order to reduce glare or in order to provide a wide distribution angle of the light emitted downwards , in particular a distribution angle of at least 160 ° , in particular at least 170 ° . A distribution angle always refers to an angle around the tube axis . Preferably, the optical foil has a thickness of 0 , 2 mm to 0 , 5 mm, in particular 0 , 2 mm to 0 , 4 mm . Preferably, the optical foil is attached to the bottom optical section of the tubular housing releasably, in particular by being press- fitted between fixing proj ections provided at the inner side of the tubular housing within the bottom optical section . Preferably, the set comprises di f ferent optical foils each having di f ferent optical properties but each being adapted to be releasable fixed to the housing in order to reali ze the operating state , in particular to be press- fitted between said fixing proj ections provided at the inner side of the tubular housing within the bottom optical section . This allows easy assembling and disassembling of the components of the set in order to reali ze the operating state , respectively starting from the operating state of the set . Preferably, the proj ections are arranged below the second surface section or each are formed by a lower end of the second surface section . Accordingly, the foil can be arranged so as to influence as little as possible the emission of light upwards . Preferably, the optical foil is arranged displaced to the prismatic structures of the sidewall portions described above , in particular between said sidewall portions in a transverse direction . Quite generally, in the present application, the transverse direction is a direction being perpendicular to the vertical direction, and transverse and vertical direction both are perpendicular to the longitudinal direction .

In one embodiment , the light emitted by the bottom optical section is emitted from an emission surface of the tubular housing which is curved, in particular U-shaped or circular, i . e . shaped by a section of a circle . The emission surface preferably is the outer surface as mentioned above . Preferably, the optical foil is arranged along a curved section of the inner side of the tubular housing, in particular along section of the tubular housing which at its outer surface having the above-mentioned curved emission surface , respectively outer surface .

In one embodiment the set comprises an additional gear tray being detachably fixed, in particular snap fitted, to the mounting element in the operating state at a vertical distance from the gear tray, in particular above the gear tray, in particular closer to the first mounting section than to the second mounting section of the mounting element . Preferably, the additional gear tray, in the operating state , is arranged closer to the upper end of the inner side of the tubular housing than to the bottom end of the inner side of the tubular housing . Preferably, the additional gear tray is spaced apart from the upper end of the inner side of the tubular housing by a vertical distance which is less than its vertical distance from the mounting panel of the gear tray and/or which is less than 1 / 4 , in particular 1 / 5 , in particular 1 / 6 of the maximum vertical extension of the interior space in the operating state . The mounting element , accordingly, preferably comprises a third mounting section corresponding to the additional gear tray for allowing detachable fixing of the additional gear tray to the mounting element and therethrough to the tubular housing . According to the preferable embodiment , the set comprises an additional light module , wherein, in the operating state , the additional light module is arranged on a top side of the additional gear tray facing away from the mounting panel of the gear tray, wherein light emanating from the additional light module in the operating state is emitted to the surroundings of the housing . The tubular housing comprises a top optical section being arranged above the bottom optical section and above the additional gear tray surrounding at least partially the top side of the additional gear tray, wherein in the operating state at least 90 % of the light emanating from the additional light module is emitted by the top optical section, in particular upwards . The manner of partially surrounding may be reali zed analogously as described above with regard to the surrounding of the bottom side of the mounting panel by the bottom optical section . Preferably, all of the light emitted by the additional light module in the operating state is emitted upwards by the top optical section . The top optical section is comprised by the mentioned top section . In one embodiment , the top section is reali zed as top optical section in its entirety . Provision of top and bottom optical section with the top optical section being arranged above the bottom optical section, while in particular said optical sections are nonoverlapping, allows to reali ze particularly high intensity of light emitted upwards by making use of the additional gear tray as well as the additional light module . Accordingly, the set according to the advantageous embodiment of the invention allows adaptation of the luminaire to be reali zed in the operating state to environments , where a high indirect illumination is desired . The top optical section may be comprised by the above- mentioned top section, in particular the top section is formed by the top optical section . Preferably, the top optical section is configured to emit , in the operating state , some of the light emanating from the additional light module into a same area of the surroundings of the luminaire into which the bottom optical section emits some of the light emanating from the light module . Accordingly, the light distribution angles of bottom and top optical sections in the operating state are overlapping . Preferably, the luminaire being reali zed by the set in its operating state is configured to emit an entire light intensity by the tubular housing, wherein at least 40 % of the entire light intensity is emitted downwards and at least 40 % of the entire light intensity is emitted upwards and wherein at least 5 in particular at least 10 % of the light emitted upwards is emanating from the light module . Accordingly, this embodiment of the inventive modular set on the one hand provides a remarkable amount of light emitted upwards by the light module which is arranged at the bottom side of the gear tray, whereas through the provision of the additional light module at the top side of the additional gear tray a luminaire can be reali zed in the operating state of the set which emits a remarkable amount of light both upwards and downwards . Therefore , the modular set allows easy reali zation of a luminaire which has an unobtrusive appearance and provides quite sophisticated lamination of surroundings . In one embodiment , the top optical section comprises a prismatic structure at its inner side . Preferably, at least 60 % , in particular at least 70 % , in particular at least 80 % of the light being emitted upwards by the top optical section has been deflected by the prismatic structure . Preferably, the light emitted upwards by the top optical section having traversed the prismatic structure of the top optical section has a light distribution angle of at least 100 ° , in particular at least 120 ° , in particular at least 150 ° around an axis parallel to the longitudinal direction . Preferably, the light emanating from the additional light module being emitted from the top optical section to the surroundings after having traversed the top optical section comprising the prismatic structure is emitted over a light distribution angle which amounts to at least 120 % , in particular at least 150 % of its light distribution angle over which it enters the top optical section comprising the prismatic structure at its inner side . The prismatic structure allows a very easy reali zation of a broad distribution angle , in particular by reali zing the prismatic structure , in particular the below-illustrated tube element , by extrusion process . In particular, the light emanating from the additional light module reaches the prismatic structure without being directed by an optical element arranged between the additional light module and the prismatic structure .

In one embodiment the set comprises a top side optical element being attached, in particular releasably attached, in particular snap fitted, to the top side of the additional gear tray and surrounding the additional light module such that at least 80 % , in particular at least 90 % of the light emanating from the additional light module traverses the top side of the optical element before reaching the top optical section of the tubular housing . This top side optical element allows a large freedom of determining the light distribution characteristics referring to the light emanating from the additional light module . Preferably, the modular set comprises a plurality of di f ferent top side optical elements each be configured to be attached to the top side of the additional gear tray as described and each providing di f ferent deflection of light emanating from the additional light module . Accordingly, by choosing an appropriate of these top side optical elements , light distribution characteristics can easily be adj usted by the choice of top side optical element when reali zing the operating state , i . e . reali zing a speci fic luminaire . Preferably, the set comprises a driver for controlling the light module as well as an additional driver for controlling the additional light module . In the operating state , the driver and the additional driver both are fixed to the tubular housing by being fixed to the mounting element . The mounting element accordingly may also serve for fixation of driver and additional driver which makes the modular reali zation of a luminaire quite easy and cost-ef ficient . Preferably, the driver and the additional driver are fixed to the tubular housing by being fixed to the gear tray, wherein the gear tray in particular is fixed to the tubular housing by the mounting element . Preferably, the driver and the additional driver are configured to be supplied by respectively individual supply lines . Accordingly, driver and additional driver each have a separate input for supply lines by which they may be supplied . Preferably, driver and additional driver control the light module , respectively additional light module independent from each other .

In one embodiment the gear tray comprises a cable channel section arranged at a top side of the mounting panel . The cable channel section defines a channel , in particular cylindrical channel , as a free space within the interior space extending with its free channel cross-section continuously over at least 80 % , in particular at least 90 % of the length of the tubular housing . The channel may serve as a guide to guide a cable extending over the length over the tubular housing . Such cable can allow a through- connection of electric energy through the luminaire reali zed in the operating state which is particularly advantageous for reali zing a row of luminaires , respectively a row of tubular housings each having a light module and in particular an additional light module and which are arranged in a row along the longitudinal direction . The cable channel section may be j ust a free cross-section within the interior space . In particular, the cable channel section at least in longitudinal sections is defined by a geometric border provided within the interior space of the luminaire , the geometric border confining the cable channel physically in at least one direction perpendicular to the longitudinal direction, in particular confining the cable channel on both sides along this direction perpendicular to the longitudinal direction . Preferably, the cable channel is a linear channel , which, accordingly, extends along a linear direction along the longitudinal direction and along this linear direction continuously as a free cross-section . Preferably, the gear tray comprises two separate components being detachably connected to each other in the operating state , a first of these components providing the mounting panel and a second of these components providing a border of the cable channel section, wherein in particular the second component and the first component together confine the cable channel section . Said second component , accordingly, serves as a geometric border of the free cross-section of the channel . Preferably, said second component extends along at least 30 % , in particular at least 50 % , in particular at least 70 % of the length of the tubular housing . Preferably, first and/or second component of the gear tray are made of a sheet of metal or of plastic, in particular a sheet of plastic . Preferably, the cable channel section is arranged below the fixing means of the tubular housing, in particular below the first mounting section of the mounting element , in particular below the above-mentioned additional gear tray and/or the above-mentioned top section . Preferably, the cable channel section extends , throughout its vertical extension, within the vertical extension of the bottom optical section . Preferably, the cable channel section is arranged between the bottom side of the gear tray and the top side of the additional gear tray . Preferably, the cable channel section is arranged between the second mounting section of the mounting element and one of the sidewall portions of the bottom optical section with regard to the transverse direction . Preferably, the cable channel section is spaced apart from the center of the cross-section of the interior space referring to the cross-section perpendicular to the longitudinal direction . Accordingly, in the center of the cross-section of the tubular housing there may be enough space for further components of a luminaire , like a driver and/or additional driver, whereas the cable channel section may be arranged displaced to the center of the cross-section of the interior space . Preferably, the cable channel section is arranged between the sidewalls , respectively flank portions of the gear tray, referring to the transverse direction . Preferably, one of the sidewalls , respectively flank portions , of the gear tray serves as geometric border, i . e . geometric limitation of the cable channel section in transverse direction . Preferably, the gear tray comprises a first section having a U-shaped cross-section including a bottom portion and two flank portions , wherein the cable channel section is arranged at least partially within the U- shaped cross-section of the first section, wherein in particular the gear tray comprises a second section being arranged within the U-shaped cross-section of the first section, the cable channel section being defined on a first lateral side by one of the flanks and on a second lateral side by the second section . The lateral sides define a geometric limitation of the cable channel section with regard to the transvers direction . The flanks of the first section may correspond to the sidewalls of the gear tray described above . Preferably, the bottom portion of the gear tray serves as geometric limitation of the cable channel with regard to the vertical direction . First and second section may be provided by first and second components of the gear tray described above , such that the first section is provided by the first component and the second section is provided by the second component . Preferably, the cable channel section is defined, in its transverse extension, on the one side by one of the flanks of the first section and on its second side by the second section of the gear tray . First and second sections may be continuous along the longitudinal direction or may have interruptions along the longitudinal direction such that they provide a geometric border of the cable channel section only within longitudinal sections . In any case , the cable channel section has a free cross-section which is continuous throughout the length of the cable channel section .

In one embodiment the tubular housing is shaped to provide two proj ections at its inner side , wherein the fixing means comprises said two proj ections . In the operating state , the first mounting section of the mounting element is locked to said proj ections and the light module , and in particular the additional light module , is arranged between said proj ections . Accordingly, the first mounting section of the mounting element is designed corresponding with said two proj ections , e . g . the first mounting section may be configured as having two proj ections such that the mounting element is pressed in transverse direction between the two proj ections comprised by the fixing means , wherein the proj ections of the first mounting section of the mounting element and the proj ections of the tubular housing are pressed against each other . The proj ections may be sidewalls of recesses provided in the tubular housing, respectively in the mounting element . Preferably, the first mounting section of the mounting element has two recesses , wherein, in the operating state , each of the two proj ections is situated in one of these recesses associated to it . The two proj ections are spaced apart from each other with regard to the transverse direction and accordingly are facing each other in the transverse direction . The light module may extend, with regard to the transverse direction, at least partially, in particular exclusively between said proj ections of the tubular housing, and the same may be true for the additional light module . Preferably, the tubular housing has a circular shaped cross-section throughout at least 70 % , in particular at least 90 % of its length, in particular throughout its entire length, wherein in particular the two proj ections provided at the inner side of the tubular housing are formed by a deviation of the circular shape , and preferably each of the proj ections provided at the inner side of the tubular housing goes along with the recess at the outer side of the tubular housing formed by this same deviation of the circular shape of the cross-section which forms the respective proj ection . Generally preferable , the tubular housing comprises two recesses at its outer side at a position of one of the proj ections , respectively, such that each one of said recesses is positioned at a position of one of said two proj ections . Preferably, the bottom optical section and the top optical section each extend over a transverse extension which is longer than a transverse distance between the proj ections . The transverse distance refers to a distance along the transverse direction . Preferably both the top section, in particular top optical section, and the bottom optical section have a curved shape being formed like an arc, wherein the transverse distance between the proj ections is shorter than the distance between the transverse ends of both arcs . Preferably, both arcs have a diameter which amounts to at least 130 % of the transverse distance between the proj ections . This allows the reali zation of a large emission surface , i . e . outer surface of the tubular housing by which light emanating from the light module , in particular additional light module , is emitted, wherein the proj ections serve for reliable fixation of the mounting element . Preferably, the transverse distance between the proj ections amounts to less than 80 % of the maximum transverse extension of the interior space in the operating state . Preferably, the two proj ections extend over at least 50 % , in particular at least 70 % of the length of the tubular housing, in particular over the entire length of the tube element described later . Preferably, the bottom optical section is arranged only below said proj ections and the proj ections form bottom ends of the top section, or the proj ections form top ends of the bottom optical section and the top section is arranged only above said proj ections , or the bottom optical section and top section each form a vertical portion of said proj ections wherein the top section and the bottom optical section are directly lying at each other with their respective vertical portions . Preferably, the set comprises a mounting device being configured to be corresponding with the two recesses built at the outer side of the tubular housing at the position where the two proj ections are formed at the inner side of the tubular housing, wherein the mounting device is configured to be releasably fixed to said recesses in order to fix the luminaire in the operating state to a ceiling which is arranged over the top end of the tubular housing . Such mounting device , e . g . , may be designed like a bracket or may comprise two hooks , each of the hooks being configured to be positioned with one hook end inside one of the recesses .

In one embodiment , the tubular housing has a first fastening means at each of its longitudinal ends , wherein each of the end caps has a second fastening means , the first fastening means and the second fastening means corresponding to each other to allow fastening of each of the end caps at each of the longitudinal ends of the tubular housing providing a press- fit between the end cap and the longitudinal end to which its fixed such that the end cap is pressed along a contact surface of the tubular housing against the tubular housing, wherein the contact surface surrounds the interior space at the longitudinal end of the tubular housing . Due to the press- fit which results in pressing the end cap along the contact surface which surrounds the interior space , the interior space is sealed against the surroundings of the luminaire in the operating state of the set . The contact surface in particular surrounds the interior space uninterruptedly . In one embodiment , the contact surface extends with a first surface section surrounding the interior space around the tube axis along the longitudinal direction and extends with a second surface section surrounding the interior space around the tube axis along the vertical direction, wherein the press fit is caused by a vertical force , i . e . radial force with regard to the tube axis , pressing the end cap against the tubular housing along the first surface section, and is caused by a longitudinal force pressing the end cap against the tubular housing along the second surface section . The combination of such surface sections allows easy reali zation of a good seal . Preferably, a gasket , e . g . having at least one of the features described below, is arranged between the tubular housing and the end cap along said contact surface , such that the end cap is pressed at least to a section of the contact surface , in particular to said first and/or second surface section, indirectly via the gasket against the contact surface . Such gasket , in particular made of plastics and preferably being elastic, provides an improved sealing . The set preferably comprises a plurality of identically formed gaskets , wherein in the operating state both end caps are pressed to the respective longitudinal end of the housing to which they are associated at least over a surface section of the contact surface via such gasket . Preferably, further ones of this plurality of gaskets used as the gasket for connection between tubular connection element and tubular housing and/or for connection between end cap and tubular module housing, respectively tubular housing and tubular module housing as described below . First and second fastening means are configured corresponding to each other such that they can engage with each other in order to reali ze detachable fixation with each other thereby reali zing said press- fit . In particular, the first and second fastening means are configured to be detachably fixed to each other only by relative movement to each other, such that first and second fastening means can be attached to each other without the need of further means . Preferably, first and second fastening means are configured to be detachably fixed to each other only by turning relative to each other around a rotation axis which is parallel to the longitudinal axis and thus parallel to the tube axis . In particular, the rotation axis is the tube axis . This allows particularly easy fastening and detaching of first and second fastening means . Preferably, first and second fastening means are configured as bayonet closure . Preferably, the first fastening means is arranged at an outer side portion of the tubular housing and the second fastening means are arranged at an inner side portion of the respective end cap which comprises the respective second fastening means . The arrangement of first fastening means and the outer side of the tubular housing and of second fastening means at the inner side of the end cap makes it possible that the end cap forms a longitudinal outer side portion of the luminaire in the operating state , and in this longitudinal outer side portion which may extend over a remarkable length speci fic features may be provided in the retaining sidewalls of the end cap, like a grommet or a pre-stamped cut out , which may allow access to the interior space . Accordingly, the tubular housing may be manufactured cost-ef ficient with regard to these features being present in the end cap . In particular, the tubular housing with its first fastening means may be , in the operating state , arranged within the end cap which is particularly advantageous for the outer appearance of the luminaire . Preferably, the outer side of the end cap is aligned flush with the outer side of the tubular housing at the transition from the end cap to the tubular housing in the operating state . Preferably, the first fastening means comprises a first portion which is inserted into the end cap in the operating state as well as a second portion which is pressed against a longitudinal end of the end cap in the operating state . Said second portion may be designed as flange abutting against the end cap with a pressing force which is directed along the longitudinal axis . In particular, said flange may provide said above-mentioned second surface section of the contact surface .

In one embodiment , the tubular housing comprises a tube element as well as two end elements , wherein the end elements each are connected undetachably, in particular welded or glued, to respectively one longitudinal end of the tube element . In the operating state , each of the end caps is sealingly and detachably fixed to respectively one of the end elements which is associated to the longitudinal end of the tubular housing to which the respective end cap is associated . The provision of the tube element on the one hand as well as of the two end elements on the other hand allows easy manufacturing of the tubular housing . In particular, the tube element may be manufactured by extrusion process , in particular co-extrusion process , in particular in case the top section and the bottom optical section are made of di f ferent material . Generally, the tubular housing may be manufactured of plastics . The tube element , in particular, has a continuous cross-section perpendicular to the longitudinal direction over at least 90 % of its longitudinal extension, in particular over its entire longitudinal extension . In particular, each of the end elements comprises one of the first fastening means of the tubular housing, respectively, wherein in particular each of the end elements comprises said contact surface illustrated above against which the respective end cap is pressed in the operating state . Preferably, the end elements comprise three longitudinal portions , wherein the first longitudinal portion is an insertion portion which is inserted in the tube element and the second longitudinal portion being arranged between first and third longitudinal portions is a flange portion abutting against a longitudinal end of the tube element and wherein a third longitudinal portion is a fastening portion which comprises said first fastening means arranged at a respective longitudinal end of the tubular housing provided by said end element . Preferably, the flange portion and the fastening portion together provide said contact surface , wherein in particular the flange portion comprises at least partially, in particular entirely, said second surface section of the contact surface , and the fastening portion comprises at least partially, in particular entirely, said first surface section of the contact surface . Preferably, the flange portion is welded or glued to the tube element thereby providing a seal surrounding the interior space in an uninterrupted manner . The insertion portion preferably has a geometric shape corresponding to the shape of the inner side of the tube element such that by only inserting the insertion portion inside the tube element the end element is rotationally fixed with regard to the tube element , i . e . the insertion portion alone being arranged inside the tube element avoids rotation in any direction of the end element relative to the tube element . This avoidance of rotation refers to a rotation around the tube axis , and this avoidance may be reali zed by abutting portions comprised by the insertion portion and abutting portions comprised by the tube element , wherein said abutting portions abut against each other when the insertion portion being inserted inside the tube element with an abutting direction which is perpendicular to the tube axis . Thus , the end element is fixed to the tube element making use of two di f ferent principals : the flange portion guarantees a reliable seal , whereas the insertion portion guarantees avoidance of rotation between tube element and end element such that the seal provided by the flange portion is not stressed due to a rotational force acting on the end element relative to the tube element . Preferably, the abutting portions of the tube element are provided by said proj ections of the tubular housing which form the fixing means of the tubular housing . The flange portion may at its first longitudinal side be sealingly connected to the tube element , and at its second longitudinal side in the operating state may be sealingly connected with the end cap, in particular via a gasket as disclosed with regard to embodiments in the present application . Preferably, in the operating state , each of the end caps is fixed to the tubular housing only via respectively one of the end elements to which it is associated . Accordingly, the end element alone , in this particular embodiment , provides a first fastening means to which the end cap is fixed with its second fastening means .

In one embodiment the gear tray is fixed to each of the end elements by a retaining means being arranged inside the interior space and being detachably fixed to the respective end element , wherein the end elements thereby define a longitudinal position of the gear tray relative to the tubular housing and/or define a vertical position of the longitudinal ends of the gear tray relative to the tubular housing . The retaining means may be detachably connected to the respective end elements , e . g . , by screwing or snap fitting . Preferably, the retaining means close only a portion of the free cross-section of the tubular housing, wherein by closing said portion of the free cross-section, the position of the gear tray within the tubular housing is defined, and by leaving open another portion of the free cross-section through wiring may be guided through this other portion . Preferably, the retaining means is designed plate-like with proj ections , wherein the plate-like section of the retaining means extends perpendicular to the longitudinal direction in the operating state and the proj ections extend along the longitudinal direction, such that the plate-like section may limit the longitudinal position of the gear tray and the proj ections may define the vertical position of the longitudinal ends of the gear tray relative to the tubular housing .

In one embodiment , the set comprises a tubular connection element as well as a plurality of the tubular housing . Each of the tubular housings has features as described in the present application with regard to one of the embodiments of the set , wherein in particular each of the tubular housings is identically, such that it has identically shape . The tubular connection element is configured to be mounted between two of these tubular housings in an elongated operating state of the set in which an elongated luminaire is reali zed . The elongated operating state is a further arrangement of the components of the set . The components of the set which are connected to each other in the elongated operating state which are also connected to each other in the operating state may be connected in identical manner as described with regard to the operating state , and the further properties of the luminaire described in the operating state may be present in the elongated operating state . In the elongated operating state , the tubular connection element is detachably fixed to both tubular housings at their ends facing each other, wherein the tubular connection element and the tubular housings with their inner sides together confine an interior space of the elongated luminaire . Preferably, in the elongated operating state of the set , respectively one of the end caps is attached to that longitudinal end of respectively one of the tubular housings which faces away from the longitudinal end to which the tubular connection element is fixed, such that the interior space of the elongated luminaire is defined together by the end caps , the tubular housings and the tubular connection element . The tubular connection element , in particular, has a length along the longitudinal direction which amounts to less than 50 % , in particular less than 30 % of the length of each of the tubular housings . Since the tubular connection element is configured to be mounted between two of the tubular housings , an elongated luminaire can be reali zed with an uninterrupted interior space which extends throughout both tubular housings and the tubular connection element connecting said tubular housings . Each of the tubular housings , of course , has two longitudinal ends facing away from each other . These longitudinal ends define the length of the tubular housing . In one embodiment , in which each of the tubular housings with one of its longitudinal ends is connected to the tubular connection element and with the other one of its longitudinal ends is connected to an end cap, a sealed interior space is provided which is described in the present application with regard to various embodiments concerning the operating state . In one embodiment , the tubular connection element has a third fastening means at each of its longitudinal ends , the first fastening means and the third fastening means corresponding to each other to allow fastening of the tubular connection elements to each end of each of the tubular housings providing a press- fit between the tubular connection element and the longitudinal end to which it is fixed such that the tubular connection element is pressed along a contact surface of the tubular housing which surrounds the interior space at the longitudinal end against the tubular housing . The contact surface of the tubular housing is associated to one particular longitudinal end of the tubular housing . Accordingly, in the operating state in which a particular tubular housing is used which is also used in the elongated operating state , each of the end caps is pressed against the contact surface of the longitudinal end of the tubular housing to which it is associated, wherein in the elongated state the tubular connection element is pressed against the contact surface of one of the longitudinal ends and one of the end caps is pressed to the contact surface of the other longitudinal end . The properties of said fastening between third and first fastening means as well as the design of first and third fastening means can be reali zed as described in various embodiments with regard to first and second fastening means , wherein the respective longitudinal end of the tubular connection element which comprises the third fastening means may be fixed to the first fastening means of the respective longitudinal end of the tubular housing in a manner as described for the second fastening means of the end caps by which the end cap is fixed to the respective longitudinal end of the tubular housing . Particularly, the third fastening means may be arranged at an inner side of the tubular connection element . Preferably, the third fastening means are designed in the same manner as the second fastening means . Preferably, the third fastening means are provided at an inner side of an end portion of the tubular connection element , whereas the first fastening means are provided at an outer side of an end portion of the tubular housing . By designing the tubular connection element in such a way that it can be connected to the tubular housing at each of its longitudinal ends , and by providing end caps which can be fixed to each longitudinal ends of the tubular housing, assembly of the modular set for reali zing an elongated luminaire is remarkably simpli fied, and manufacturing costs are lowered due to making use of identical components , respectively identically designed components . In one embodiment , the tubular connection element , at its inner side , comprises a fixation means . In one embodiment , the modular set comprises a first tubular connection element as well as a second tubular connection element each having the features of said tubular connection element according to one of the presently disclosed embodiments , wherein first and second tubular connection element di f fer from each other in that only the first tubular connection element comprises such fixation means whereas the second tubular connection element does not comprise such fixation means , in particular has a flat , i . e . smooth inner side . The set comprises a functional gear tray which in the elongated operating state is fixed to the fixation means . A functional element , in particular a detection means like a camera or infra-red-sensor or a communication means like a WI FI- or Bluetooth-module , is arranged at the functional gear tray . The tubular connection element accordingly can provide for an enhanced functionality of the elongated luminaire . The fixation means may comprise proj ections being formed by the inner side of the tubular connection element . Said proj ections of the inner side of the tubular connection element can be designed as described with regard to the proj ections comprised by the fixing means of the tubular housings in various embodiments , wherein e . g . in particular at the outer side at a position where the fixation means is provided, recesses may provided at the tubular connection element which allow attachment of a mounting device as described above . The functional gear tray may di f fer from the gear tray and additional gear tray as described above . In particular, the functional gear tray may be designed plate-like in order to provide a suf ficiently large mounting surface to which the functional element can be mounted . In one embodiment , the tubular connection element is lightproof over at least 60 % , in particular at least 70 % , of its inner side and comprises an exit window releasably closed by a light transmissive cover comprised by the tubular connection element . This configuration allows a hidden arrangement of the functional element but at the same time allows communication between the functional element and the surroundings . At this point , it should be mentioned that the design of the tubular connection element being manufactured of plastics is particularly advantageous for the arrangement of communication means like a WI FI- or a Bluetooth-module within the tubular connection element , since such communication can be carried out even through a non-light- transmissive wall section of the tubular connection element .

In one embodiment the set comprises a tubular module housing, wherein in an extended operating state , in which an extended luminaire is reali zed, the tubular module housing is detachably fixed to one of the ends of the tubular housing, wherein one of the end caps is fixed to the longitudinal end of the tubular housing facing away from the tubular module housing and another one of the end caps is fixed to the longitudinal end of the tubular module housing facing away from the tubular housing, wherein an interior space of the extended luminaire is defined together by the end caps , the tubular housing and the tubular module housing . Accordingly, the tubular module housing, in contrast to the tubular connection element , is not configured for connecting two tubular housings but is configured to be positioned between the tubular housing and an end cap thereby elongating the tubular housing . In one embodiment , the tubular module housing has fourth fastening means at at least one of its longitudinal ends , the second fastening means and the fourth fastening means corresponding to each other to allow fastening of each one of the end caps at the longitudinal end of the tubular module housing at which there is provided the fourth fastening means providing a press- fit between the end cap and the longitudinal end to which is it fixed, i . e . where the fourth fastening means is provided, such that the end cap is pressed against a contact surface of the tubular module housing which surrounds the interior space at the longitudinal end . The fourth fastening means may be configured corresponding to the second fastening means as described above with regard to various embodiments concerning the corresponding design of first and second fastening means . Preferably, the fourth fastening means is arranged at an outer side of the tubular module housing . In one embodiment , only one end of the tubular module housing is provided with a respective fourth fastening means , whereas the other end of the tubular module housing is provided with a fi fth fastening means which corresponds to the first fastening means in a way that with this end the tubular module housing can be directly fixed to a longitudinal end of the tubular housing as described with regard to the fastening of an end cap to such longitudinal end of the tubular housing . The fi fth fastening means , accordingly, may be corresponding to the first fastening means to allow fastening of the tubular module housing with its longitudinal end at which the fi fth fastening means is provided at each of the longitudinal ends of the tubular housing providing a press fit between said longitudinal end of the tubular module housing and said longitudinal end of the tubular housing such that the tubular module housing is pressed against a contact surface of the tubular housing which surrounds the interior space at the longitudinal end of the tubular housing . Preferably, the fi fth fastening means is arranged at an inner side of the tubular module housing . Advantageous embodiments of the corresponding designs of first and fi fth fastening means may have features as discloses above with regard to the corresponding design of first and second fastening means . Preferably, the fi fth fastening means is designed in a same manner as the second and/or as the third fastening means . However, in one embodiment , the tubular module housing has fourth fastening means at each of its longitudinal ends , wherein particular said fourth fastening means provided at each of said longitudinal ends are designed in an identical manner . Preferably, the fourth fastening means is designed in the same manner as the first fastening means . Such advantageous embodiment has the advantage that the tubular module housing can be designed at both of its longitudinal ends in such manner that it can be fixed to a corresponding tubular housing, respectively end cap and both of its longitudinal ends in an identical manner . However, in this case , the tubular module housing cannot be directly fixed to the tubular housing, since first and fourth fastening means do not correspond to each other in a way such that they can be fixed to each other only by themselves , but a sealing connection element is required which is to be mounted between the tubular module housing and the tubular housing . Such sealing connection element can be designed as described below .

In one embodiment , the tubular module housing, at its inner side , comprises a module fixation means , wherein the set comprises a module gear tray which, in the extended operating state , is fixed to the module fixation means . A module , in particular a detection means or communication means , in particular as described above , is arranged at the module gear tray, wherein in particular the tubular module housing is lightproof over at least 60 % , in particular at least 70 % of its inner side and, preferably, comprises an exit window releasably closed by light transmissive cover comprised by the tubular module housing . The module gear tray can be di f ferent compared to the gear tray and the additional gear tray . In one embodiment , the module gear tray is identical to the functional gear tray described above . The module fixation means can be designed as described with regard to the fixing means and/or with regard to the fixation means described in various embodiments in the present application .

The provision of the modular set comprising a plurality of tubular housings , a tubular connection element as well as a tubular module housing, and of course , in addition end caps , allows the design of di f ferent luminaires having di f ferent type of interior spaces . By a speci fic choice to be made out of tubular housings , tubular module element and tubular connection element , these components can be attached to each other being arranged in a row along the longitudinal direction and being sealingly connected to each other .

In one embodiment , the set comprises a sealing connection element . The sealing connection element is adapted for sealingly connecting two end caps of the set . Accordingly, the sealing connection element is designed so that it can be used for sealingly connecting said two end caps , although this is not a typical operating state of the set . However, as it is adapted for sealingly connecting two end caps , it can similarly be used for e . g . sealingly connecting one of the end caps with a longitudinal end of the tubular connection element or for sealingly connecting one of the end caps or said tubular connection element with a longitudinal end of the tubular module housing having the fi fth fastening means as disclosed for advantageous embodiments in the present application . The sealing connection element comprises a flange portion being arranged in the longitudinal direction between two cylindrical portions , each of the cylindrical portions having a sealing connection element fastening means corresponding to each of the second fastening means . Accordingly, such sealing connection element fastening means may also be corresponding to each of the third fastening means such that such sealing connection element can be mounted between a tubular connecting element and the tubular module housing having the fi fth fastening means at one of its ends in order to provide a sealed connection between the tubular module housing and the tubular connection element . The manner of correspondence between the sealing connection element fastening means and the second fastening means can be as disclosed in the present application with regard to the manner of correspondence between the first and second fastening means . In particular, both sealing connection element fastening means are identically shaped . Preferably, the sealing connection element fastening means is designed identically compared to the first and/or fourth fastening means . Preferably, the sealing connection element fastening means is arranged at an outer side of the sealing connection element . In one embodiment , the sealing connection element comprises a core element as well as two gaskets , the core element providing the flange portion as well as the sealing connection element fastening means , respectively the cylindrical portions , wherein the two gaskets are arranged at opposite sides of the flange portion, wherein the sealing connection element fastening means and the second fastening means are configured to be connected by pressing the gasket between a longitudinal end of the tubular housing to which the sealing connection element is fixed by this fastening means and the flange portion of the sealing connection element . Accordingly, in an operating state in which the sealing connection element is fixed to one longitudinal end of the tubular housing, one of said gaskets is pressed by the flange portion of the sealing connection element against the longitudinal end of the tubular housing, wherein the pressing force acting between the longitudinal end, the flange portion of the sealing connection element and the gasket is provided by the corresponding engagement of sealing connection element fastening means and first fastening means . Thereby, the gasket is preferably pressed against a contact surface of the end cap which surrounds an interior space of the end cap at the longitudinal end of the end cap, wherein in particular the contact surface extends with a first surface section surrounding the interior space around the longitudinal direction along the longitudinal direction and extends with a second surface section surrounding the interior space around the longitudinal direction along the vertical direction, wherein the press fit is caused by a vertical force , i . e . radial force with regard to the tube axis , pressing the gasket against the end cap along the first surface section, and/or is caused by a longitudinal force pressing the gasket against the end cap along the second surface section . Accordingly, the core element is in contact with the contact surface at least over a section of the contact surface , in particular over the entire contact surface , indirectly via the gasket . Of course , identically the end cap is pressed by respective vertical and/or longitudinal force via the gasket against a contact surface of the core element of the sealing connection element , as disclosed above with regard to the press fit between the end cap and the tubular housing reali zed through first and second fastening means . In particularly advantageous embodiments , such a gasket is also provided when reali zing the operating state , respectively elongated operating state , respectively extended operating state , between the end cap and the tubular housing, respectively between the tubular connection element and the tubular housing, respectively between the tubular module housing and the end cap and/or the tubular module housing and the tubular housing, thereby being pressed between the respective components by engagement of respective fastening means of the components . Preferably, the sealing connection element has an extension along the longitudinal direction which is less than 1 / 10 , in particular less than 1 /20 of the length of the tubular housing . Preferably, the longitudinal extension of the sealing connection element is less than 1 / 3 , in particular less than 1 / 5 of the longitudinal extension, i . e . length, of the tubular module housing and/or the tubular connection element . Preferably, in an operating state in which luminaires are reali zed, and in which the sealing connection element is used for connecting two components of the set as described above , only the flange portion of the sealing connection element forms a portion of the outer side of the luminaire , whereas the cylindrical portions are inserted inside the two components which are connected by the sealing connection element to each other . Generally preferable , the tubular housing and the end caps and in particular the tubular module housing and/or the tubular connection element and in particular the flange portion of the sealing connection element have the same outer diameter such that connecting said components to a longitudinal arrangement , i . e . in a row along the longitudinal direction, a luminaire can be reali zed which has a continuous outer diameter throughout its entire length, wherein preferably in an operating state of the set in which such luminaire is reali zed, the outer sides of the connected components are flush to each other .

In one embodiment , at least one of the end caps comprises a bottom as well as a retaining sidewall surrounding the bottom, wherein in the operating state the end cap is fixed with its retaining sidewall to the tubular housing and an electrical wire is passing through the bottom or through the sidewall from the surroundings of the luminaire into the interior space . Of course , the respective design of the end caps can also be applied in embodiments of sets being adapted for reali zing an extended luminaire respectively elongated luminaire . Preferably, the second fastening means are arranged only at the retaining sidewall , in particular only at the inner side of the retaining sidewall . Preferably, the second fastening means is arranged only within a longitudinal portion of the end cap which comprises one longitudinal end facing away from the bottom and extends over less than 1 / 3 of the longitudinal length of the end cap with which the end cap extends from said longitudinal end up to the bottom . Preferably, the second fastening means extend over at least 1 / 10 , in particular at least 1 / 5 of said longitudinal length of the end cap, in particular said second fastening means extend up to said longitudinal end facing away from the bottom . Preferably, the bottom is made of a first material and the sidewall is made of a second material being di f ferent from the first material . Preferably, the first material is softer than the second material , wherein in particular the end cap is manufactured by bi-inj ection moulding . The first material being softer than the second material , i . e . the second material having higher sti f fness than the first material , allows provision of reliable fastening means , wherein at the same time the bottom may comprise at least one grommet portion adapted to provide a sealed connection to an outer side of an electrical cable comprising said electrical wire . Preferably, at least one of the end caps comprises prestamped cut-outs in the bottom and/or in the sidewall . Such pre-stamped cut-outs comprise a breaking line surrounding a closed area, wherein the breaking line , in a basic state of the end cap, in which it is used for assembling a luminaire at the point of starting the assembling, the breaking line connects the closed area continuously with a further area surrounding the pre-stamped cut-out , wherein the breaking line may be broken by hand in order to provide a cut-out in the bottom, respectively sidewall . Preferably, a cut-out is made of the same material as the area directly surrounding the cut-out being comprised by the end cap . Preferably, the breaking line is reali zed by a reduction of thickness of the sidewall , respectively bottom at the position of the breaking line , such that the breaking line is formed by a recess provided in the bottom, respectively sidewall . Preferably, the second material is less elastic than the first material . Preferably, the grommet reali zed in the bottom is made of elastic material , whereas the cut-outs are made of sti f f material .

In one embodiment the set comprises at least two tubular housings , each of said housings comprising features as defined in one of the embodiments disclosed in the present application, wherein one of the tubular housing is light transmissive only within its bottom optical section but is lightproof at its top section, whereas the other one of the tubular housings is light transmissive both within its bottom optical section and within its top section, wherein in particular said other tubular housing is light transmissive throughout its entire extension . Preferably, the tubular housings each are formed by extrusion, in particular the first one mentioned being formed by coextrusion . The tubular housings may be formed at least partially or completely by extrusion . Preferably, at least the mentioned tube element comprised by each housing is completely formed by extrusion . Generally, in the present application, the term transmissive refers to transmissive with regard to light , wherein the term light refers to light being visible for the human eye , wherein transmissive may be reali zed as being translucent or as being transparent .

The present invention referring to a modular set has the speci fic advantage that even by emitting light only from the light module by the bottom optical section alone direct and indirect illumination can be obtained . Accordingly, a luminaire having a tubular housing reali zed by the set according to the invention, the tubular housing being lightproof throughout its top section can be used for various applications . By providing two di f ferent housings , the first one being lightproof at its top section, the second one being light transmissive at its top section, in particular at least throughout the top optical section, the second type of tubular housing may be used for applications where a higher intensity of indirect illumination is desired, for which the provision of an additional light module as disclosed in the present application is advantageous . The inventive modular set therefore has the large advantage that luminaires can be reali zed of remarkable di f ferent length by combining di f ferent tubular housings , tubular connection elements , tubular module housings and/or sealing connection elements and end caps , and by choosing the tubular housing as desired, be it with lightproof or with light transmissive top section, and by choosing selectively only a light module or a light module and an additional light module , selectively operatively designed luminaires can be reali zed which are convenient for all di f ferent kind of applications throughout a company which allows a unique design of the illumination installation and easy maintenance throughout an entire company .

The invention further refers to a luminaire which is reali zed by one of the presently disclosed embodiments of a modular set . The luminaire comprises the components of the set as described with regard to the respective embodiment , wherein these components are arranged as presently described with regard to the operating state , the elongated operating state and/or the extended operating state or with regard to further described operating states of the modular set . In one embodiment the luminaire comprises two end caps and only one tubular housing, wherein each of the two end caps is sealingly fixed to one of the longitudinal ends of the tubular housing such that the end caps and the tubular housing together define an interior space of the luminaire in which the light module of the luminaire is arranged and which is sealed against the surroundings of the luminaire .

In one embodiment , the luminaire comprises two end caps , two tubular housings and at least one sealing connection element , wherein the sealing connection element is arranged between the tubular housings connecting the tubular housings in a sealed manner such that the tubular housings and the sealing connection element together define a continuously extending part of the interior space of the luminaire , wherein this part of the interior space extends continuously throughout the longitudinal extensions of the tubular housing and the sealing connection element , wherein this interior space in particular is defined by the end caps , the tubular housings and the sealing connection element . In one embodiment the luminaire comprises two end caps , two tubular housings , a tubular module housing and tubular connection element , wherein the tubular connection element is arranged between the tubular housings connecting the tubular housings in a sealed manner and wherein the tubular module housing is arranged at one of these tubular housings being connected to it in a sealed manner, wherein one of the end caps is sealingly connected to the other one of the tubular housings and the other end cap is sealingly connected to the tubular module housing such that the two tubular housings , the tubular connection element , the tubular module housing and the two end caps together define an interior space which is sealed against the surroundings . In each of the embodiments , the longitudinal ends of the luminaire are preferably formed by said two end caps . Preferably, a luminaire according to the invention has the same outer cross-section throughout at least 70 % , in particular at least 80 % of its entire longitudinal extension . In particular, the luminaire has the same maximum diameter, i . e . maximum extension perpendicular to the longitudinal direction, throughout at least 90 % , in particular throughout at least 95 % of its entire longitudinal extension, in particular throughout its entire longitudinal extension .

The invention further refers to a gas tight luminaire comprising at least the tube element , the gear tray and the light module of one embodiment of the modular set disclosed in the present application . Said gas tight luminaire comprises two end portion components being undetachably connected, in particular by welding or by glueing, to the tube element . Accordingly, in this gas tight luminaire the tube element of said embodiment of the inventive modular set is used, but neither the end caps of the set nor the end elements of the set , but instead the end portion components are used which are undetachably connected to the longitudinal ends of the tube element thereby defining a gas tight interior space of the luminaire . The end portion components may be designed as combination of end caps and end elements which are undetachable connected or may be designed comprising at least longitudinal portions of said end elements , respectively end caps . The gas tight luminaire further comprises an electric wiring extending from the surroundings of the tube element through one of the end portion components into the tube element and being in electrical connection with the light module , wherein the tube element and the end portion components define an inner space of the luminaire in which the light module is arranged and which is gas sealed against the surroundings of the luminaire . The light module may be attached to the gear tray and the gear tray may be attached to the tube element as described in the present application with regard to various embodiment of the inventive modular set . The inventive gas tight luminaire accordingly can be manufactured costef ficient by making use of particularly selected components of the inventive modular set , wherein at the same time a reliable gas tight seal of the inner space is obtained by an undetachable connection of the end portion components to the tube element .

The invention further refers to a method for fabricating a luminaire making use of one of the embodiments of the inventive set . In a first step, the gear tray to which the light module is fixed is inserted into the tubular housing and fixed to the inner side of the tubular housing . In a second step one of the end caps is fixed to one of the longitudinal ends of the tubular housing thereby defining and sealing the interior space of the luminaire . The other end cap may be fixed to the other one of the longitudinal ends before or after the first step or may be fixed to a longitudinal end of a tubular module housing or a further tubular housing which is fixed to the other one of the longitudinal ends of the tubular housing, wherein at least one tubular connection element , additional tubular housing and/or sealing connection element may be arranged between the tubular module housing, respectively further tubular housing, and said tubular housing . In particular embodiments , the end cap is fixed to the tubular housing, respectively tubular module housing, respectively sealing connection element , by a combination of a movement along the longitudinal direction and a rotation around the tube axis relative to the tubular housing, respectively tubular module housing, respectively sealing connection element .

Preferably, by this movement a sealed connection between the end cap and the tubular housing, respectively tubular module housing, respectively sealing connection element , is obtained . Similarly, the tubular connection element or the tubular module housing, in one embodiment , is attached to one of the longitudinal ends of the tubular housing by a movement which consists of a movement along the longitudinal direction and a rotation around the tube axis relative to the tubular housing, wherein this movement alone leads to a sealed connection between the tubular connection element , respectively tubular module housing, to the tubular housing .

The invention is described in further details by describing one illustrative particular embodiment of the inventive modular set making reference to seven figures which illustrate :

Figure 1 : in a schematic drawing a view of some components of an embodiment of the modular set being in an operating state of the set ; Figure 2 : in several schematic drawings cross-sections of several components of the embodiment according to figure 1 ;

Figure 3 : in several schematic drawings views of speci fic components of the embodiment according to figure 1 ;

Figure 4 : in several schematic drawings views of an end cap of the embodiment according to figure 1 ;

Figure 5 : in several schematic drawings views of the tubular connection element , respectively a module , according to the embodiment of figure 1 ;

Figure 6 : in several schematic drawings views of the tubular module housing, respectively a module , according to the embodiment of figure 1 ;

Figure 7 : in several schematic drawings views of a sealing connection element of the embodiment of figure 1 .

Figures 1 to 7 show di f ferent views of di f ferent components in di f ferent states of an embodiment of a modular set according to the invention . Figure 1 is a schematic drawing showing a view of some of the components of the set in a particular operating state . Figure 2 comprising figures 2a, 2b, 2c, 2d and 2e shows cross-sections of various components of the set , in particular in their arrangement relative to each other in a speci fic operating state of the set . Figure 3 comprising figures 3a, 3b, 3c, 3d and 3e shows in various views a longitudinal end of the tubular housing 2 of the set , in particular with some further components arranged therein, in particular with regard to the end element 8 and tube element 20 comprised by the tubular housing 2 . Figure 4 comprising figures 4a and 4b shows in various views one of the end caps of the set . Figure 5 comprising figures 5a, 5b, 5c, 5d and 5e shows in various views a tubular connection element 200 as well as a functional gear tray 500 with a module 510 fixed thereon . Figure 6 comprising figures 6a and 6b shows in various views a tubular module housing 100 and a module gear tray which corresponds to the functional gear tray 500 . Figure 7 comprising figures 7a, 7b and 7c shows in various views a sealing connection element 300 .

Figure 1 shows a typical geometric shape of a luminaire reali zed by an embodiment of the modular set according to the invention, wherein the components of the set are arranged in a particular operating state for reali zing the luminaire . Figure 1 only shows a view on one longitudinal end of the luminaire , but already from figure 1 it can be seen that the luminaire is elongated in the longitudinal direction X . Preferably, the tubular housing 2 has a length along the longitudinal direction X which amounts to at least five times , in particular at least ten times of its maximum extension in any direction perpendicular to the longitudinal direction X . Of course , this ratio of its extensions in particular is true for the luminaire reali zed by said embodiment of the modular set , which is advantageous in general . In figure 1 it is shown the tubular housing 2 being sealingly connected to the tubular module housing 100 which at its longitudinal end facing away from the tubular housing 2 is sealingly connected to an end cap 9 . The end cap 9 comprises a bottom 92 as well as a retaining sidewall 91 , as can be seen in detail in figure 4 comprising figures 4a and 4b . The retaining sidewall 91 comprises a grommet portion 912 as well as a pre-stamped cut-out section 911 , and identically the bottom 92 comprises a respective grommet portion 922 as well as a respective pre-stamped cut-out portion 921 . The tubular module housing 100 itsel f also comprises such pre-stamped cut-out portions 921 . As can be seen form figure 1 , the tubular housing 2 , the tubular module housing 100 and the end cap 9 together define an interior space of the luminaire which is sealed with regard to the surroundings of the luminaire but which can be entered through the grommet portions 912 , 922 , respectively pre-stamped cut-out portions 911 , 921 in order to pass an electric cable comprising electric wiring from the outside of the luminaire into the sealed interior space . Of course , in this case , in order to maintain the interior space sealed, the grommet portions 912 , 922 themselves comprise a sealing contact to the outer side of such electric cable , whereas an additional sealing means has to be arranged within the cut-outs after having broken out the cut-out sections 911 , 921 when passing a electric cable through said cut-outs sections 911 , 921 inside the interior space in order to maintain the interior space sealed .

In figure 2 comprising figures 2a, 2b, 2c, 2d and 2e the principle setup of the cross-section of several components of the embodiment of the modular set is illustrated . In figure 2b, the cross-section of the tube element 20 of the tubular housing 2 is shown alone . The tubular housing 2 has the cross-section of its tube element 20 , in particular as shown in figure 2b, over at least 70 % , in particular at least 80 % , in particular at least 90 % of its longitudinal extension, which in general is preferable for any embodiment of the invention . As can be seen in figure 2b, the tubular housing 2 comprises a bottom optical section and a top section, wherein in the present embodiment the top section is designed as top optical section 26 being light transmissive . The bottom optical section comprises a bottom portion 25 forming the bottom end of the inner side of the tubular housing as well as sidewall portions extending from the bottom portion 25 in a vertical direction Z upwards . The sidewall portions each comprise a prismatic structure 21 as well as a top wall portion 24 . The tube element 20 , respectively the tubular housing 2 , further comprises , at its outer side , recesses 22 , which, at the inner side of tubular housing 2 , form fixing means 23 of the tubular housing 2 , the fixing means 23 in the shown embodiment being formed by the proj ections which result from the recesses 22 at the outside of the tubular housing 2 . A mounting element

3 comprised by the set is fixed to the fixing means 23 in the operating state . Such mounting element 3 is shown in figures 2a and 2c to 2e . The mounting element 3 is shaped like a U and has a first mounting section 35 at its upper end and a second mounting section 31 , 32 , 34 to which the gear tray 4 comprised by the set is fixed in the operating state . The mounting element 3 , being U-shaped, comprises two flanks being connected by a transverse connection rod 33 in order to provide suf ficient sti f fness . In the operating state , the gear tray 4 comprised by the modular set is attached to the second mounting section 31 , 32 , 34 of the mounting element 3 , as can be seen from figures 2a, 2d and 2e . The gear tray 4 comprises a first section having a U- shaped cross-section including a bottom portion 42 and two flank portions 41 as well as a second section 6 being arranged within the U-shaped cross-section of the first section . The bottom portion 42 of the first section provides a mounting panel of the gear tray 4 to which a light module 5 is fixed, wherein the second section 6 of the gear tray 4 together with one of the flank portions 41 of the gear tray

4 forms a cable channel having a free cross-section . The free cross-section of the cable channel extends throughout the entire extension of the tube element 20 , which is preferable in general . The second section 6 has preferably a C-shape or a L-shape being attached to a particular section 34 of the second mounting section of the mounting element 3 , wherein further particular sections 31 , 32 of the second mounting section of the mounting element 3 serve for fixation of the first section of the gear tray 4 , wherein in the present embodiment the mounting panel of the gear tray 4 is directly fixed by these particular sections 31 , 32 of the second mounting section to the mounting element 3 . Generally preferable , the second section 6 being C-shaped or L-shaped is fixed to the mounting element 3 such that it faces said flank portion 41 of the first section with its open end .

The modular set further comprises a bottom side optical element 251 as well as an optical foil 252 as well as an additional gear tray 46 , an additional light module 56 and a top side optical element 261 . The bottom side optical element 251 is attached to attaching means 45 provided at the mounting panel of the gear tray 4 . The additional gear tray 46 is attached to the tubular housing 2 by the mounting element 3 , in particular at the same vertical height at which the fixing means 23 of the tubular housing 2 is provided, which is preferable in general . The additional light module 56 is attached to a top side of the additional gear tray 46 , whereas the light module 5 is attached to a bottom side of the mounting panel of the gear tray 4 . Accordingly, light module 5 and additional light module 56 are facing away from each other with regard to the vertical direction Z . The top side optical element 261 is attached to the top side of the additional gear tray 46 surrounding at least partially the additional light module 56 , and the bottom side optical element 251 is attached to the bottom side of the mounting panel of the gear tray 4 surrounding at least partially the light module 5 . The optical foil 252 is arranged at the bottom portion 25 of the bottom optical section between, with regard to the transverse direction Y, the prismatic structures 21 and being non-overlapping with the prismatic structures 21 , which is advantageous in general . The optical foil 252 is press- fitted between proj ections provided at the inner side of the tube element 2 , which is preferable general , and in particular said proj ections are formed at the ends of the prismatic structures 21 by which the prismatic structures 21 provided at the di f ferent sidewall portions of the tubular housing 2 are facing each other . Accordingly, the bottom side of the mounting panel of the gear tray 4 is arranged, in the transverse direction Y, between said two sidewall portions of the bottom optical section and is arranged at a vertical distance with regard to the bottom end of the inner side of the tubular housing 2 which is formed by the bottom portion 25 of the bottom optical section . As can be seen from figure 2 comprising the above-mentioned figures , the modular setup allows the installation of a bottom side optical element 251 at the bottom side of the mounting panel of the gear tray 4 which has a remarkable vertical extension, in particular extends over at least 1 / 10 , in particular at least 1 / 7 , in particular at least 1 / 5 of the vertical extension of the tubular housing 2 . Thereby the bottom side optical element 251 can be provided with appropriate prismatic structures which provide distribution of the light emanating from the light module 5 . The prismatic structures 21 of the tubular housing 2 are configured to deflect light emanating from the light module 5 and having traversed the bottom side optical element 251 upwards , such that the sidewall portions of the tubular housing 2 at the outer side of the prismatic structures 21 emit light emanating from the light module 5 upwards to provide indirect illumination . This indirect illumination is further supported by the additional light module 56 . Direct illumination, however, is provided by the bottom portion 25 of the bottom optical section of the tubular housing 2 which emits light emanating from the light module 5 downwards which before has traversed both the bottom side optical element 251 and the optical foil 252 .

The optical foil 252 , which e . g . has a thickness of 0 , 35 mm, allows an additional way of directing light , and since it is press- fitted along a curved shape of the inner side of the bottom portion 25 of the bottom optical section it can be easily installed according to the needs of the speci fic application for which the modular set shall be used .

From figure 3 comprising figures 3a, 3b, 3c, 3d and 3e it can be seen that the tubular housing 2 comprises the tube element 20 to which the gear tray 4 is fixed in the operating state by a plurality of mounting elements 3 which are spaced from each other in the longitudinal direction X, as well as two end elements 8 being undetachably fixed to respectively one of the longitudinal ends of the tube element 20 . These end elements 8 comprise a flange portion arranged between an insertion portion and a fastening portion with regard to the longitudinal direction X . The insertion portion comprises a shape being adapted to be inserted inside the tube element 20 , wherein this shape is adapted to the shape of the inner side of the tube element 20 such that by insertion the end element 8 is fixed with regard to a rotation around the tube axis relative to the tube element 20 . The end elements 8 further comprise a welding line 82 which is welded to the hori zontal ends of the tube element 20 to provide a continuous , uninterrupted seal around the interior space of the luminaire in the operating state , i . e . a continuous , uninterrupted seal around the free cross-section of the tubular housing 2 . The fastening portion forms the first fastening means 80 comprised by the tubular housing 2 . The end elements 8 further comprise screw holes 81 to which a retaining means 85 can be releasably fixed . This retaining means 85 as a plate-like section as well as proj ections 851 , 852 extending from the plate-like section along the longitudinal direction X . The retaining means 85 being attached releasably to the end elements 8 of the tubular housing 2 allow fixed positioning of the gear tray 4 both with regard to the longitudinal direction X and with regard to the vertical direction Z , and in the transverse direction Y the gear tray 4 is fixedly held by the mounting element 3 . Since the retaining means 85 can be removed from the end element 8 , the gear tray 4 and/or the light module 5 and/or driver attached to the gear tray 4 can be removed for maintenance purposes after the retaining means 85 has been removed from the end element 8 .

The end caps 9 , as shown in figure 4 comprising figures 4a as well as figure 4b and as have been explained already above comprise second fastening means 90 and at their inner side , whereas the tubular housing 2 comprises first fastening means 80 at its outer side . First and second fastening means 80 , 90 are configured corresponding with each other, presently in the way of a bayonet closure , such that by a movement of the end cap 9 along the longitudinal direction X and a subsequent rotation of the end cap 9 around the tube axis relative to the tubular housing 2 results in a sealed and fixed connection between the tubular housing 2 and the end cap 9 . A gasket 400 as shown in figure 7 can be used for ensuring a sealed connection between a longitudinal end of the tubular housing 2 and a respective end cap 9 , wherein the gasket 400 is pressed between the end cap 9 and the tubular housing 2 along respective contact surfaces which each have a first surface section surrounding the tube axis and extending in the longitudinal direction, along which a vertical pressing force applies , as well as a second surface section surrounding the tube axis and extending in the vertical direction, along which a longitudinal pressing force applies .

Figure 5 comprising figures 5a, 5b, 5c, 5d and 5e show a tubular connection element 200 as well as a functional gear tray 500 and a module 510 . The tubular connection element 200 , at its longitudinal ends , has third fastening means 290 being designed identically like the second fastening means 90 explained above . Accordingly, the tubular connection element 200 can be used for connecting two identically designed tubular housings 2 . The tubular connection element 200 has a surrounding sidewall 220 with recesses 222 formed therein at its outer side . The recesses 222 are formed at the same vertical position as the recesses 22 in the tubular housing 2 , such that in the operating state the recesses 222 fall in line with the recesses 22 along the longitudinal direction X which is preferable in general . The tubular connection element 200 at its inner side comprises fixation means 223 to which the functional gear tray 500 is attached . The functional gear tray 500 comprises a platelike element 520 as well as a fixing element 530 . By the fixing element

530 the platelike element 520 is held pressed against the proj ections formed by the fixation means 223 . For this purpose , the fixing element 530 has , which is advantageous in general , a platelike section 531 as well as hook sections

532 , wherein in the operating state the platelike section

531 lies on the top side of the fixation means 223 and the hook sections 532 lie at the bottom side of the fixation means 223 . The hook sections 532 are of elastic properties and press with an elastic force against fixation means 223 thereby pressing the plate section 531 against the fixation means 223 . The fixing element 530 comprises further hooks

533 , 534 , by which further elements , in particular electric cables , can be guided . The module 510 , presently a camera module , is attached to the plate element 520 of the functional gear tray 500 .

Figure 6 comprising figures 6a and 6b shows a tubular module housing 100 . The tubular module housing 100 comprises module fixation means 123 which are designed like the fixation means 223 of the tubular connection element 200 explained above . At its longitudinal ends the tubular module housing 100 comprises fastening means . At one of its ends , it comprises a fourth fastening means 180 which corresponds to the second fastening means 90 of the end caps 9 , and at its opposite longitudinal end it comprises fi fth fastening means 190 which correspond to the first fastening means 80 . Accordingly, the tubular modular housing 100 with its fourth fastening means 180 can be releasably and sealingly attached to an end cap 9 and with its fi fth fastening means 190 can be releasably and sealingly attached to a longitudinal end of the tubular housing 2 as has been described before with regard to the connection of the end cap 9 with the tubular housing 2 . The tubular modular housing 100 further has a grommet portion 121 allowing to pass through an electric cable in a sealed manner . The tubular module housing 100 comprises a sidewall 120 surrounding the interior space enclosed by the tubular module housing 100 . The sidewall 120 is designed lightproof . The same , in the present embodiment , is true for the sidewall 220 of the tubular connection element 200 according to figure 5 . However, the sidewalls 120 , 220 each have an exit window closed by a cover 110 , 210 which is light transmissive , such that a sensor, like a camera, can watch trough said exit cover 110 , 210 . Cover 110 , 210 together with a sidewall 120 , 220 form an entirely closed tube which continuously and uninterruptedly encloses an interior space of the tubular connection element 200 , respectively the tubular module housing 100 and accordingly enclose a part of the interior space of the luminaire in the operating state of the set .

Figure 7 comprising figures 7a, 7b and 7c shows several views of a sealing connection element 300 . The sealing connection element 300 comprises a flange portion 370 being arranged between two cylindrical portions as well as two gaskets 400 . The cylindrical portions each comprise a sealing connection element fastening means 380 which corresponds to the second fastening means 90 as well as to the third fastening means 290 as well as to the fi fth fastening means 190 . Accordingly, the sealing connection element 300 can be connected in a sealing and detachable manner to one of the longitudinal ends of the tubular module housing 100 , to each of the longitudinal ends of the tubular connection element 200 as well as to each of the end caps 9 . The gaskets 400 have a cylindrical shape with through holes 480 within their cylindric wall , wherein the sealing connection element fastening means 380 extend through said through holes 480 , which is generally preferable . In an operating state , the sealing connection element 300 can be sealingly and releasably attached to an end cap 9 , respectively to one of the other components as described above , by pressing the gasket 400 against the retaining sidewall 91 of the end cap 9 and against the flange portion 300 and cylindrical portion of the connection element 300 . Ma/ sk March 10 , 2022

Applicants : TRI LUX GmbH & Co . KG 59759 Arnsberg ZALUX S .A. 50012 ZARAGOZA

Modular sealed luminaire

Reference sign list

2 tubular housing

3 mounting element

4 gear tray

5 light module

6 second section of the gear tray

8 end element

9 end cap

20 tube element

21 prismatic structure

22 recess

23 fixing means

24 top wall portion

25 bottom portion

26 top optical section

31 second mounting section

32 second mounting section

33 connection rod

34 second mounting section

35 first mounting section

41 flank portion

42 bottom portion attaching means additional gear tray additional light module first fastening means screw hole welding line retaining means second fastening means retaining sidewall bottom tubular module housing cover sidewall grommet portion module fixation means fourth fastening means fi fth fastening means tubular connection element cover sidewall recess fixation means bottom side optical element optical foil top side optical element third fastening means sealing connection element flange portion sealing connection element fastening means gasket through holes functional gear tray module plate-like element 530 fixing element

531 plate-like section

532 hook section

533 hook 534 hook

851 proj ection

852 proj ection

911 pre-stamped cut-out section

912 grommet portion 921 pre-stamped cut-out portion

922 grommet portion

X longitudinal direction

Y transverse direction

Z vertical direction