Description of Invention

The presently claimed invention relates to light fittings, heat sink members, and a flexible circuit member and heat sink member combination. More particularly, some embodiments of the present invention relate to light fittings including light emitting diode (LED) light sources along with heat sink members which may be for use with such light fittings.

Conventional incandescent and fluorescent light fittings are being replaced by more energy efficient and more environmentally friendly light emitting diode (LED) light fittings.

Conventional light fittings comprise a housing to contain the incandescent or fluorescent light source. The housing has an aperture through which light emitted by the light source is directed. One or more reflectors may be provided to direct light through the aperture. A light diffuser may be provided which covers the aperture and helps to diffuse (i.e. scatter) the light which passes therethrough.

Many LED light fittings mimic the previous conventional light fittings - as these are proven designs and are in demand.

However, LEDs emit a far narrower beam of light than conventional light sources (which might generally be considered to be omni-directional light sources). In addition, each LED typically emits far less light than a single conventional light source. Therefore, an array of LEDs is usually required to provide sufficient light over the required region. However, when LEDs (or an array of LEDs) are used as the light sources in otherwise conventional light fittings, the light emitted by the LEDs is not sufficiently diffused to provide uniform or substantially uniform light emission across the aperture of the housing of the fitting. Instead, the location of each individual LED is typically identifiable as a bright spot of light.

The provision of a diffuser which diffuses the emitted light to a greater extent also reflects more light back into the fitting - so less light leaves the light fitting. This is therefore not an adequate solution to the problem.

The present invention seeks to ameliorate one or more problems associated with the prior art.

Accordingly, an aspect of the present invention provides a light fitting comprising: a housing defining an aperture and a cavity; a reflector at least partially located within the cavity of the housing; and a light source including one or more light emitting diodes arranged with respect to the housing and reflector such that a substantial part of the light emitted by the one or more light emitting diodes passes indirectly through the aperture by passing through at least part of the cavity and reflecting from the reflector through the aperture.

The light source may include a plurality of light emitting diodes which are configured such that the substantial part of the light emitted by the diodes intersects in a predetermined region.

The reflector may be located in the predetermined region.

The substantial part of the light emitted by the or each light emitting diode may pass across at least part of the aperture in a plane generally parallel with a plane of the aperture before being reflected by the reflector. The light source may include a plurality of light emitting diodes mounted on a flexible circuit board member.

The reflector may comprise a disc with a reflective surface.

The reflector may include a domed central portion.

The domed central portion of the reflector may be surrounded by at least one inclined annular surface.

The light fitting may further comprise a diffuser located to diffuse light which passes through the aperture.

The one or more light emitting diodes may comprise a ring of light emitting diodes and the reflector is located within the ring of light emitting diodes.

The light emitting diodes may define an illumination plane along which the substantial part of the light emitted by the light emitting diodes passes, and wherein the reflector intersects the illumination plane.

The light fitting may further include a heat sink member coupled in thermal communication with the light source.

The heat sink member may be positioned remote from the reflector with respect to the light source.

The heat sink member may have a curved first wall and one or more splines extending therefrom. Another aspect of the present invention provides a light fitting comprising: a can; a support assembly including a support ring; a light source including at least one light emitting diode, wherein the can is configured to receive the support ring, and the support ring is configured to support the light source such that the light source and support ring are rotatable with respect to the can about a longitudinal axis of the can and the light source is rotatable with respect to the longitudinal axis of the can.

The support ring may be located between a collar of the light fitting and an annular bearing member of the light fitting. The collar may be part of a flange assembly of the light fitting.

The light source may include a heat sink.

The can may include one or more ventilation apertures associated with an intumescent body which is configured to close the one or more ventilation apertures when exposed to fire.

The light source and the support ring may include cooperating brackets. Another aspect of the present invention provides a heat sink member for use with a light fitting, the heat sink member comprising: a curved first wall configured for abutment with a part of a light source; and one or more splines extending away from the curved first wall. The heat sink member may be a member as above and the flexible circuit member is configured to be coupled to the first wall of the heat sink member.

The flexible circuit member may be a light source configured to emit light away from the heat sink member when coupled thereto. Another aspect of the present invention provides a flexible circuit member and heat sink member combination, wherein a light source is coupled to a first side of the flexible circuit member and the heat sink member is coupled to a second side of the flexible circuit member.

The first and second sides may oppose each other across a width of the flexible circuit member.

Embodiments of the present invention are described, by way of example only, with reference to the accompanying drawings in which:

Figure 1 shows an exploded view of a light fitting according to an embodiment;

Figure 2 shows a cross-sectional view of a light fitting according to an embodiment;

Figure 3 shows an external view of a light fitting according to an embodiment; Figure 4 shows an external view of a light fitting according to an embodiment;

Figure 5 shows a cross-sectional view of a light fitting according to an embodiment;

Figure 6 shows section "c" of figure 5 in more detail;

Figure 7 shows a schematic view of an electrical system of an embodiment; Figure 8 shows an exploded view of an embodiment; Figure 9 shows a partial cross-sectional view of an embodiment; Figure 10 shows another partial cross-sectional view of an embodiment; Figure 1 1 shows another partial cross-sectional view of an embodiment; Figures 12-14 show another embodiment of the present invention; Figures 15-18 show a heat sink member of embodiments; and Figure 19 shows another embodiment of the present invention.

Referring to figures 1 to 6, an embodiment of the present invention comprises a light fitting 1 or other lighting arrangement. The light fitting 1 comprises a housing 2 which defines an aperture 3 through which light is to be emitted. The aperture 3 may be circular, square, hexagonal, pentagonal, or any other desired shape.

The housing 2 may be configured to enclose and/or retain one or more electrical lighting components. For example, the housing 2 may be configured to enclose an electrical transformer, and/or an electrical switch, and/or an electrical connection for coupling to an electrical supply.

The housing 2 is also configured to receive a light source 4. The light source 4 is configured to emit light for transmission through the aperture 3. The light source 4 is configured for connection to an electrical supply 5. The electrical supply 5 may include (see figure 7) an external supply 6 of electricity to the light fitting 1 and/or may include a battery 7 which is located within the housing 2. The connection to the electrical supply 5 may be via a plurality of wires, and /or one or more transformers, and/or one or more switches and/or one or more electrical connections (which may each be housed within the housing 2 or which may be external to the housing 2). The light source 4 includes one or more light emitting diodes 8 (LEDs). The or each LED 8 is oriented such that a substantial part of the light emitted by the LED 8 is not delivered directly through the aperture 3. In particular, the or each LED 8 is mounted such that a substantial part of the light emitted is directed generally parallel to a plane of the aperture 3 and across at least part of the aperture 3. In the case of a circular aperture 3, for example, the or each LED 8 may transmit light generally radially inwardly across at least part of the aperture 3.

The or each LED 8 is configured such that a substantial part of the light emitted thereby passes through a predetermined location. In embodiments in which a plurality of LEDs 8 are provided, then the LEDs 8 may be configured such that a substantial part of the light emitted by the LEDs 8 passes through a predetermined location which is otherwise referred to as an intersection region - i.e. a region in which a substantial part of the light emitted by a first of the plurality of LEDs 8 intersects a substantial part of the light emitted by a second of the plurality of LEDs 8. In embodiments, a substantial part of the light of all of the LEDs 8 of the plurality of LEDs 8 intersects in the intersection region.

In embodiments, there are a plurality of intersection regions each of which is associated with a plurality of LEDs 8. In embodiments, the or each LED 8 is mounted on a flexible circuit member 9. The flexible circuit member 9 includes conductors to couple the or each LED 8 to the electrical supply 5. In embodiments, a plurality of LEDs 8 are mounted on a single flexible circuit member 9. In embodiments, there is a plurality of flexible circuit members 9 and a plurality of LEDs 8 are mounted to each flexible circuit member 9. In embodiments, the plurality of flexible circuit members 9 are coupled to each other electrically and/or physically. In embodiments, the plurality of flexible circuit members 9 are daisy-chained together such that each flexible circuit member 9 is coupled to at least one other flexible circuit member 9. In embodiments, there is a plurality of LEDs 8 which are arranged in modules. Each module may comprise a circuit board to which one or more LEDs 8 are connected. The circuit boards of the modules may be rigid or flexible. In embodiments, the modules are arranged such that the LEDs 8 thereof face inwardly towards a predetermined location. In embodiments, there are two modules provided which are arranged substantially parallel to each other and oppose each other across a separation gap.

The or each LED 8 may be provided in a surface mount technology package or through-hole package.

In embodiments, the or each flexible circuit member 9 includes a protective resistor for each LED 8 mounted thereon.

In embodiments, the flexible circuit member 9 is part of a longer flexible circuit member 9 - a strip of flexible circuit member material. The strip of flexible circuit member material comprises a plurality of modules. Each module includes one or more LEDs 8. Electrical contacts may be provided on each module to allow each module to be connected to the electrical supply 5. The modules may be electrically coupled to each other by one or more electrical conductors. The strip of flexible circuit member material may be configured to be cut or split between each module. Thus, a strip of flexible circuit member material may be manufactured and then cut to size (i.e. into modules) for the desired application. The or each LED 8 may be configured to emit light of the same frequency (or frequencies). In embodiments, a plurality of LEDs 8 are provided and the LEDs 8 are configured to emit light of at least two different colours in the visual spectrum - with each LED 8 emitting one colour of light in the visual spectrum.

In embodiments, a reflector 10 is provided. The reflector 10 is configured to be mounted to and/or within the housing 2 and the housing 2 is configured to receive at least part of the reflector 10. The reflector 10, when received by the housing, is located within the path of the substantial part of the light emitted by the or each LED 8. The reflector 10 is configured to reflect a substantial part of the light incident on the surface of the reflector 10 towards the aperture 3. The reflector 10 may also be configured such that the reflected light diverges to a greater extent than the light which is incident on the reflector 10. In other words, the reflector 10 may be configured to spread the light out.

In embodiments, the or each LED 8 emits light into a cavity of the housing 2 towards the reflector 10 which is, in some embodiments, housed within the cavity. The light passes through substantially free space between the or each LED 8 and the reflector 10. In other words, the light from the or each LED 8 passes substantially directly to the reflector 10 ("directly" meaning without passing through a waveguide, such as a light guide board (LGB), or the like). The or each LED 8 may include a lens.

The reflector 10 may be located at the intersection region.

In embodiments, a plurality of reflectors 10 is provided. In embodiments, a diffuser 1 1 is provided. The diffuser 1 1 covers substantially all of the aperture 3 such that light from the light source 4 passes through the aperture 3 and the diffuser 1 1 . In embodiments, the light emitted by the light source 4 passes through the aperture 3 and the diffuser 1 1 before illuminating an object to be illuminated.

The light fitting 1 may be a bulkhead-type light fitting - as shown in figures 1 to 3. The light fitting may comprise a housing 2 with a substantially circular cross- section. In embodiments, the housing 2 has a substantially rectangular, square, or triangular cross-section. The housing 2 includes a tray 12. The tray 12 or another part of the housing 2 is configured to receive a light source 4 and at least part of a reflector 10. A diffuser 1 1 is provided which is configured to cover the aperture 3 defined by the housing 2. The diffuser 1 1 , in the depicted embodiment, is held in place by an annular casing 13 which forms part of the housing 2. A gasket 14 may be provided between the diffuser 1 1 and housing 2. As will be appreciated, similar arrangements are possible if the housing 2 has a non-circular cross-section - the diffuser 1 1 may have a corresponding shape and the annular casing 13 many be a peripheral casing 13.

In the embodiment depicted in figure 1 , and other embodiments, the light source 4 comprises a flexible circuit member 9 in the form of a ring. The flexible circuit member 9 carries a plurality of LEDs 8 which are arranged to face inwardly such that a substantial part of the light emitted by the LEDs 8 is directed radially inwardly with respect to the flexible circuit member 9. It will be understood that other embodiments may include a rigid circuit member or rigid circuit members (such as circuit boards) as discussed above. The reflector 10 in the embodiment depicted in figure 1 , and other embodiments, comprises a disc of material which is reflective to light in the visual spectrum. The reflector 10 includes a central domed section surrounded by a shallow inclined section which, in turn, is surrounded by a section which is more steeply inclined than the shallow inclined section. An annular flat section may be provided around the periphery of the reflector 10. In embodiments, the central section is substantially flat. In embodiments, the reflector is shaped to be received within the housing 2 and, as such, may have a square, rectangular, or triangular perimeter - for example.

The reflector 10 may be positioned such that the light emitted by the LEDs 8 is incident on the more steeply inclined section of the reflector 10, the junction between the more steeply inclined section and the shallow inclined section, and the outer periphery of the shallow inclined section of the reflector 10.

As will be appreciated, parts of the reflector 10 will also reflect light through the aperture 3 which has reflected off the diffuser 1 1 back into the housing 2.

The light fitting 1 may be a fire-rated light fitting - as shown in figures 4 to 6.

A fire-rated light fitting 1 may comprise a housing 2 which comprises a can which may be made of steel. One or more clips 15 may be provided on an exterior surface of the can. The or each clip 15 is configured to help to hold the light fitting 1 to a panel (such as a ceiling panel).

The housing 2 may include one or more ventilation apertures 16 which are associated with an intumescent body 17 which is configured to seal or otherwise close the or each ventilation aperture 16 in the event of a fire. The housing 2 may include an annular casing member 13 in the form of a flange around an aperture 3 of the housing 2. An electrical connection box 18 may be secured to the housing 2 towards an upper part thereof (i.e. a part remote from the aperture 3). The electrical connection box 18 includes one or more electrical for electrical communication with the light source 4.

The light source 4, in the fire-rated light fitting and other embodiments, is located adjacent the aperture 3 and within the housing 2. The light source 4 may comprise a flexible circuit member 9 in the form of a ring. The flexible circuit member 9 may carry a plurality of LEDs 8 which is mounted in an inwardly facing arrangement.

A reflector 10 is located within the housing 2 such that the light emitted by the LEDs 8 is incident on the reflector 10. The reflector 10 is configured to reflect the incident light through the aperture 3 defined by the housing 2. The reflector 10 may be of a similar configuration to the reflectors 10 described above.

A diffuser 1 1 may be located such that the diffuser 1 1 covers a substantial part of the aperture 3.

It will be appreciated that other forms of light fitting may incorporate a light source 4 and reflector 10 as described herein. In embodiments, the indirect light transmission through the diffuser 1 1 using the reflector 10 ensures that the light is spread over a larger region of the diffuser 1 1 . The light emitted, as a whole, from the light fitting 1 may be, as a result, similar in form of the light emitted by a conventional light fitting. An embodiment of the present invention comprises a light fitting 100 in the form of a downlight - see figures 8 to X. The light fitting 100 may be a fire- rated downlight. The light fitting 100 comprises a can 101 which may be formed of steel. The can 101 carries one or more clips 102 which are configured to assist in holding the light fitting 100 in place with respect to a panel to which the light fitting 100 is to be fitted (e.g. a ceiling panel). The can 101 may include one or more ventilation apertures 103. The or each ventilation aperture 103 is associated with an intumescent body 104 which is configured to close the or each ventilation aperture 103 in the event of a fire.

An electrical connection box 105 may be secured to a distal end of the can 101 and may contain (or otherwise include) electrical connectors for the supply of electricity to the light fitting 100.

A proximal end of the can 101 may define an aperture 106 of the can 101 . A flange assembly 107 may be provided and configured to fit to the can 101 such that a portion of the flange assembly 107 in the form of a collar extends into the can 101 through the aperture 106. A portion of the flange assembly 107 extends radially from the can 101 adjacent the aperture 106, when fitted.

A support ring 108 is located in the can 101 and rests on an end of the collar of the flange assembly 107. The support ring 108 includes a bracket arrangement 109 which is configured to receive a support rod 1 10 - as described in more detail below. The bracket arrangement 109 may, therefore, comprise a pair of spaced tabs with respective through-holes, wherein the tabs extend towards the aperture 3 when fitted. The support rod 1 10 may comprise a bolt and a corresponding nut - as depicted. The collar of the flange assembly 107 includes an annular recess. The annular recess is configured to receive at least part of the support ring 108. The collar of the flange assembly also includes one or more apertures which extend radially therethrough and are each configured to receive a screw or the like.

An annular bearing member 1 1 1 is provided which is of similar diameter to the support ring 108. The annular bearing member 1 1 1 includes one or more apertures extending radially therethrough and each configured to receive a screw (or the like).

The light fitting 100 includes a light source 1 12. The light source 1 12 includes a light emitter which may be a plurality of light emitting diodes, for example. The light source 1 12 may, therefore, be a LED module. The light source 1 12 may have a front end through which light from the light emitter is directed out of the light source 1 12 and a rear end which opposes the front end. The rear end of the light source 1 12 may include a heat sink 1 13 which is configured to help dissipate heat generated within the light source 1 12. The light source 1 12 may include one or more control circuits for the light emitter and a connection for supplying electricity to the light emitter (which may be via the electrical connection box 105).

The light source 1 12 may include a bracket 1 14. The bracket 1 14 is located towards the front end of the light source 1 12 and is generally located towards an outer edge of the light source 1 12 towards the front end thereof. The bracket 1 14 is located away from an axis which passes through the centre of the cross-section of the light source 1 12. The bracket 1 14 may include an aperture or housing which is configured to receive a support rod 1 10. The bracket 1 14 of the light source 1 12 is sized and shaped to be received by the bracket arrangement 109 of the support ring 108. As such, the bracket 1 14 may comprise a tube which is secured to or is partially defined by a casing of the light source 1 12.

Thus, the light fitting 100 of this embodiment is constructed by locating the support ring 108 in the annular recess of the collar of the flange assembly 107. The annular bearing member 1 1 1 may then be placed on top of the support ring 108 such that the support ring is sandwiched between the flange assembly 107 and the annular bearing member 1 1 1 . One or more screws may be passed through aligned apertures in the flange assembly 107 and the annular bearing member 1 1 1 to secure the support ring 108 to the flange assembly 107. Accordingly, the apertures may be threaded. There may be four apertures which are evenly spaced around the circumference of the collar of the flange assembly 107 and a corresponding number and arrangement of apertures around a circumference of the annular bearing member 1 1 1 .

The light source 1 12 may be partially inserted into the flange assembly 107. The support rod 1 10 may be secured to the bracket 1 14 and to the bracket arrangement 109 by passing the support rod 1 10 through the bracket 1 14 and the bracket arrangement 109 - thus, securing the light source 1 12 to the support ring 108. The angle of the light source 1 12 with respect to the support ring 108 may be adjusted by rotation of the light source 1 12 about the bracket arrangement 109. The support rod 1 10 may hold the light source 1 12 at a particular angle with respect to the support ring 108 through a fictional engagement. The support rod 1 10 may press the bracket arrangement 109 against the bracket 1 14 of the light source 1 12 by tightening of the nut of the support rod 1 10, if provided. As will be appreciated, the tabs of the bracket arrangement 109 may press against respective ends of the bracket 1 14 under a force applied by the support rod 1 10. The flange assembly 107, the light source 1 12, the support ring 108, and the annular bearing member 1 1 1 are then secured to the can 101 by passing one or more screws through a wall of the can 101 and into the flange assembly 107 or otherwise into engagement with the flange assembly 107.

The support ring 108 is held in place by the flange assembly 107 and the annular bearing member 1 1 1 such that rotation of the support ring 108 with respect to the flange assembly 107 and the annular bearing member 1 1 1 is possible.

Accordingly, the light source 1 12 may be rotated within the can of the light fitting 100 about a longitudinal axis of the light fitting 100. In addition, the angle of the light source 1 12 with respect to the longitudinal axis of the light fitting 100 can be altered.

The use of a support ring 108 ensures that the light source 1 12 is securely held within the can of the light fitting 100. The support ring 108 also helps to provide thermal isolation of the light source 1 12 from the can of the light fitting 100.

The light fitting 100 may retain a fire-rating as the intumescent body 104 may close the or each ventilation aperture 103 in the event of a fire. A gasket formed from a silicon material or an intumescent material may be located around the flange of the flange assembly 107 and configured to be sandwiched between the flange assembly and a panel to which the light fitting 100 is fitted. The gasket, if provided, helps to seal the light fitting 100 to the panel and inhibit the transmission of fire through the hole in the panel to which the light fitting 100 is fitted.

It will be appreciated that, in general, the use of the intumescent bodies as described herein are references to a material which reacts to fire or excessive heat to inhibit the transmission of fire through the or each aperture associated therewith.

Embodiments of the present invention are depicted in figures 12-14. These embodiments are similar to the embodiments depicted in figures 1 -3 and the description above in relation to figures 1 -3 applies equally to these embodiments.

Embodiments of the present invention, with reference to figures 12-14 comprise a light fitting 1 or other lighting arrangement. The light fitting 1 comprises a housing 2 which defines an aperture 3 through which light is to be emitted. The aperture 3 may be circular, square, hexagonal, pentagonal, or any other desired shape. The housing 2 may house a transformer 21 , and/or an electrical switch and/or one or more electrical connectors 22 and/or one or more other electrical components of the light fitting 1 .

The light fitting 1 includes a tray 12 which is similar to the tray described in relation to other embodiments. The tray 12 may comprise an outer member 12a which may be annular and which may be configured to be at least partially received by the housing 2. The outer member 12a of the tray may have an L- shaped cross-section with a first part of the outer member 12a being configured to be attached or otherwise coupled to a part of the housing 1 and a second part of the outer member 12a may extend away from the first part. The second part of the outer member 12a may extend towards the aperture 3 when the tray 12 is fitted within the housing 2. The second part of the outer member 12a may be perpendicular to the first part.

The tray 12 may include an inner member 12b which is configured to be received by the outer member 12a of the tray 12 and which may be configured to be at least partially received by the housing 2. The inner member 12b may be in the form of a plate. The inner member 12b may substantially cover an aperture defined by the outer member 12a. The inner member 12b may include a reflective surface which faces away from the housing 2 and towards the aperture 3 when fitted. In embodiments, the inner and outer members 12a, 12b are integrally formed.

The inner member 12b of the tray 12 may be a reflector 10 of the form discussed herein. In some embodiments, the inner member 12b may include a substantially flat central portion which may be circular in shape. A peripheral surface may extend from the substantially flat central portion and may be inclined with respect to a plane of the substantially flat central portion. The peripheral surface may be inclined towards the outer member 12a of the tray 12 such that the substantially flat central portion is raised with respect to a part of the outer member 12a when fitted. In embodiments, the substantially flat central portion includes a domed portion. This form of inner member 12b may be used as a reflector 10 in relation to other embodiments disclosed herein.

A light source 4 - substantially as described herein - may be provided around the inner member 12b of the tray 12 and may be supported by the tray 12. The light source 4 may be provided around an inner surface of the inner member 12b such that light emitted by the light source 4 is directed radially inwardly with respect to the inner member 12b. In embodiments, the light source 4 is supported by a part of the tray 12 which may be the second part of the outer member 12a of the tray 12. In embodiments, the light source 4 is adjacent a part of the tray 12. In embodiments, the light source 4 abuts a part of the tray 12 - which may be the second part of the outer member 12a of the tray 12.

The light source 14 is configured to emit light towards the inner member 12b of the tray 12 (which might otherwise be referred to as the reflector 10). In embodiments, the light source 14 is positioned to direct light towards the peripheral surface of the inner member 12a. In embodiments, the light source 14 is configured to direct a substantial part of the light emitted thereby in this manner such that a substantial part of the light which is emitted by the light source 4 will be reflected by the inner member 12b before passing through a diffuser (see below).

The light source 4 may, as described above, include one or more light emitting diodes 8.

One or more heat sink members 23 are provided according to some embodiments disclosed herein. The or each heat sink member 23 is configured to distribute heat generated by the light source 4 away from the light source 4. Accordingly, the or each heat sink member 23 may be configured to conduct heat away from the light source 4.

The or each heat sink member 23 may comprise a first wall 231 which is configured to conform substantially with a part of the light source 4. For example, the first wall 231 may have a degree of curvature which corresponds with a degree of curvature of a circuit member (such as the flexible circuit member 9) of the light source 4. In embodiments, the degree of curvature of the first wall 231 dictates the degree of curvature of the flexible circuit member 9. In embodiments, the form (such as the degree of curvature) of the first wall 231 corresponds with the form of an outwardly facing surface of the tray 12 (which may be an outwardly facing surface of the first part 12a of the tray 12 and may be a surface of the second part thereof) and the or each heat sink member 23 is configured to abut at least part of the outwardly facing surface of the tray 12. The or each heat sink member 23 is configured to be positioned such that the first wall 231 is coupled in thermal communication with the light source 4 such that heat produced thereby can be conducted away from the light source 4. In embodiments, one or more splines 232 extend away from the first wall 231 of the or each heat sink member 23. The or each spline 232 may extend away radially from the first wall 231 . In embodiments, when fitted, the or each heat sink member 23 is positioned such that the first wall 231 is local to the light source 4 and the or each spline 232 extends away from the light source 4. The or each spline 232 is configured to increase the surface area of the heat sink member 23 to improve the transmission of heat from the heat sink member 23 to the surrounding atmosphere.

In embodiments, the or each heat sink member 23 is positioned outside of the path of light from the light source 4 to the reflector 10 or inner member 12b.

Thus, in embodiments, the light source 4 may include a circuit member (such as the flexible circuit member 9) with one or more LEDs 8 configured to emit light in a first direction and one or more heat sink members 23 may be positioned with respect to the circuit member such that the or each spline 232 thereof extends away in a second direction which is generally opposite to the first direction.

In embodiments, the circuit member is the flexible circuit member 9 and the flexible circuit member 9 may be mounted directly onto the first wall 231 of the heat sink member 23 - such that the flexible circuit member 9 conforms to the shape of the first wall 231 . n embodiments, the or each heat sink member 23 is a segment of a circle and a plurality of heat sink members 23 may be arranged together to form a circle

(or substantially form a circle) of heat sink members 23. In embodiments, a diffuser 1 1 is configured to be fitted to the housing 2 over the aperture 3. The diffuser 1 1 may have a substantially flat main wall and a peripheral wall which extends away from the main wall generally perpendicular thereto. A gasket 14 may be provided and may be configured to be sandwiched between the diffuser 1 1 and the housing 22 to hinder the ingress of contaminants (such as moisture and dust) into the housing 2.

A plurality of screws, washers, nuts, and bolts may be provided to couple the various components of the light fitting 1 together. A further gasket 24 may be provided and configured to fit an aperture defined by the housing 2. The further gasket 24 may be configured to receive a power supply cable or cables therethrough. As will be appreciated, the arrangement of the light source 4 and inner member 12b or reflector 10 according to the embodiments described with reference to figures X - Y form an edge-lit lighting arrangement in much the same manner as the embodiments discussed above in relation to figures 1 to 3.

Further embodiments of the above heat sink member 23 are described with reference to figures 15-18. In embodiments, the heat sink member 23 may be in the form of a bezel member to which a light source 4 is configured to be coupled - such that the light source 4 and bezel member are in thermal communication.

Accordingly, a light fitting 1 may be a spotlight or floodlight (see figure 19), for example. The light fitting may include a light source 4 which is configured with respect to one or more other components of the light fitting 1 (and, in particular, to a reflector 10 of the light fitting 1 ) such that a substantial part of the light emitted by the light source 4 is reflected by a reflector 10 before leaving the light fitting 1 (e.g. through a diffuser). The reflector 10 and light source 4 arrangement may be substantially as described above - with the light source 4 emitting light sideways towards the reflector 10 - or may be such that the light source 4 is configured to emit light backwards within the light fitting 1 towards the reflector 10 - "sideways" (or "across") and "backwards" (or "away from") being with respect to an aperture 3 of the light fitting 1 through which the light leaves the light fitting 1 .

References to a substantial part of the light emitted by an LED, as made herein, are references to the majority of the light emitted by the LED (in other words, the major part of the light). In this instance an LED is an example of a light source 4 or part thereof.

The flexible circuit member may be sufficiently flexible to conform to a curved surface. The flexible circuit member may be more flexible than a conventional printed circuit board. The flexible circuit member may be sufficiently flexible such that the member may form a loop within a domestic or commercial light fitting 1 . When used in this specification and claims, the terms "comprises" and "comprising" and variations thereof mean that the specified features, steps or integers are included. The terms are not to be interpreted to exclude the presence of other features, steps or components. The features disclosed in the foregoing description, or the following claims, or the accompanying drawings, expressed in their specific forms or in terms of a means for performing the disclosed function, or a method or process for attaining the disclosed result, as appropriate, may, separately, or in any combination of such features, be utilised for realising the invention in diverse forms thereof.