TECHNICAL FIELD

[001] The present subject matter generally relates to a bulb. Particularly, it relates to a bulb with light emitting diodes.

BACKGROUND

[002] Energy efficient systems, especially the ones that consume less electricity are on a high demand. Light Emitting Diode (LED) light sources consume less electricity as compared to conventional light sources. As LED light sources consume less electricity and light sources that consume less electricity are on high demand, therefore LED light sources are in demand. In addition, LEDs have longer life, compact size, high illumination and are less heat producing lighting sources as compared to the conventional lighting sources. Therefore, LED light sources are preferred over the conventional light sources. It is desirable that LED light source is made to be functional for optimum life without compromising on the safety of the consumer.

SUMMARY OF THE SUBJECT MATTER

[003] A light emitting diode bulb comprises a power supply circuit, a printed circuit board and a Light Emitting Diode (LED). The power supply circuit receives power from a power source and converts the received power in a form that is suitable to energize the LEDs. The life of the LED is substantially higher as compared to the life of the power supply circuit. Because of the disparity in the life of the power supply circuit and the LED of the bulb, often the bulb is left useless when any one of the power supply circuit and the LED of the bulb fails. In one instance the power supply circuit of the bulb may fail, in another instance the LED of the bulb may fail, in any one instance the bulb is rendered useless. Therefore, it is desirable that the bulb is made such that the life of the bulb is optimized.

[00 ] The present subject matter provides a solution for optimizing life of the bulb is that the power supply circuit of the bulb is made replaceable. Because the power supply circuit of the bulb is replaceable, whenever the power supply circuit fails, the power supply circuit may be replaced instead of replacing entire bulb. Similarly, in the event where the power supply circuit is still working but the LED of the bulb fails then the working power supply circuit may be used with bulb in which the LED is working.

[005] The present subject matter provides dismantling of the bulb to access the power supply circuit by a layman or a consumer. Further the present subject matter provides instead of directly disposing the power supply circuit in the bulb, the power supply circuit is disposed in a separate enclosure or housing (say, a second housing) and the second housing is disposed in the bulb. Disposing the power supply circuit in the second housing ensure that the power supply circuit is not exposed directly to a consumer when the consumer dismantles the bulb. Because the power supply circuit includes a number of electrical contacts and electrical elements, restricting direct exposure of the power supply circuit and the consumer ensures that both consumer as well as the power supply circuit is protected and do not cause any damage to each other. Another advantage of disposing the power supply circuit in the second housing is that the second housing provides an additional layer of protection which protects the power supply circuit from accidental shocks or otherwise if the bulb or the second housing is accidentally dropped. The present subject matter further provides provisions to protect the power supply circuit from accidental establishment of wrong electrical connections of the power supply circuit and the bulb. The geometry of the second housing and the bulb is designed such that the second housing may be disposed in the bulb only in one direction. And electrical contacts on the second housing and the bulb are provided such that the electrical connection is established only when the second housing is disposed in the bulb only in the manner it is intended. Geometry of the second housing is made tapered and the geometry of the bulb is configured to receive the tapered shape second housing only unidirectionally. And if a consumer attempts to dispose the second housing in any other manner than establishment of the electrical connection is prevented because of the geometry of the second housing, the bulb and the location of electrical nodes. This solution not only optimizes life of the bulb but also provides the bulb that ensures that chances of accidentally damaging the power supply circuit, LED or the consumer are reduced substantially. More details of the subject matter shall become apparent, after reading this disclosure. Thus the present subject matter enables a layman or end user to dismantle the bulb and replace or repair the failed part of the bulb.

[006] According to a first embodiment, the present subject matter provides a bulb. The bulb comprises a first housing. The first housing having a first end, a second end and a cavity. The first housing is a hollow enclosure that defines the cavity between the first end and the second end. The cavity has a first periphery at the first end and a second periphery at the second end. The first periphery is smaller than the second periphery. Different peripheral parameters of the cavity at the first end and the second end provide a taper shape to the cavity.

[007] According to another feature of the subject matter, a second housing is provided. The second housing comprises a third end and a fourth end. The second housing has a third periphery at the third end and a fourth periphery at the fourth end. The third periphery is smaller than the fourth periphery. Different peripheral parameters of the second housing at the third end and the fourth end provide a taper shape to the second housing. According to one possibility the second housing is disposed in the cavity. The second housing is provided with a power supply circuit. The power supply circuit is disposed in the second housing. The power supply circuit provides an output power suitable for the bulb. The second housing is provided with a first set of nodes. The first set of nodes comprises at least a first node provided at the third end and at least a second node provided at the fourth end. The first node and the second node are coupled through the power supply circuit. The first node provides input power to the power supply circuit and output of the power supply circuit is received at the second node.

[008] According to another embodiment, the first housing is a heat sink. According to another embodiment, the first housing may have a heat sink. According to a further embodiment the second housing is a heat sink. According to a further embodiment, the second housing may have a heat sink. In yet another embodiment both, the first housing and the second housing are the heat sink. The heat sink is used for sinking heat generated by the bulb. [009] In one embodiment the bulb is provided with an adapter coupled at the first end. The adapter comprises a third node. The adapter comprises an engager. The third node is configured to be detachably coupled to the first node. The engager is configured to engage the adapter with a power source. The third node is configured to electrically couple the power source. In one possibility the power source is external to the bulb.

[0010] According to one feature of the present subject matter the first periphery is smaller than the fourth periphery. Because of peripheral constraints and/or geometrical constraints the second housing can be disposed in the cavity in a predetermined manner. According to one feature the third end is insertable in the cavity through the second end. Further providing the first periphery smaller than the fourth periphery ensures that the fourth end is not insertable to access the first end and thereby isolating the third node from the second node. This ensures that the power supply is protected from accidental erroneous electrical connections.

[0011] According to a feature of the present subject matter the bulb is provided with a printed circuit board. The printed circuit board is configured to be attached at the second end. According to another feature, the printed circuit board comprises a fourth node. The fourth node is configured to be detachably coupled to the second node. According to another feature of the present subject matter, the bulb is provided with a lighting element and the second housing is configured to couple the power supply circuit and the lighting element. The lighting element is mounted on the printed circuit board. The lighting element is mounted on the printed circuit board such that the lighting element is in electrical contact with the fourth node. The lighting element is configured to receive energy through the power supply circuit. In one embodiment the lighting element is a light emitting diode (LED). The first set of nodes is configured to establish a current path through the power supply circuit to energize the lighting element.

[0012] According to another feature of the present subject matter, the bulb is provided with a diffuser. The diffuser is attached at the second end. The diffuser encompasses the lighting element. The diffuser is configured to diffuse light emitted by the lighting element. According to one embodiment, the printed circuit board is clamped in the diffuser and the diffuser is attached at the second end. According to one possibility the diffuser is press fitted on the second end. According to another possibility the diffuser and the second end are provided with threads and the diffuser is fitted at the second end using threads.

[0013] The present subject matter further provides a bulb assembly. The bulb assembly comprises a second housing. The second housing is tapered shaped. The second housing comprises a third end and a fourth end. The second housing has a third periphery at third end and a fourth periphery at the fourth end. The third periphery is smaller than the fourth periphery. Peripheral constraints of the third and fourth periphery provide the second housing that is configured to be disposed in a cavity of substantially similar geometry peripheral constraints. This feature is advantageous when the cavity is formed in a first housing of a bulb and the cavity has substantially taper shape that compliments the shape of the second housing and therefore when the second housing is disposed in the cavity, the cavity is configured to substantially encompass the second housing. According to a feature of the embodiment a power supply circuit is disposed in the second housing. According to another possibility the second housing is provided with a first set of nodes. The first set of nodes comprises at least a first node and at least a second node. The first node is provided at the third end and the second node is provided at the fourth end. The first node and the second node establish a current path through the power supply circuit.

[001 ] The present subject matter further provides a method of manufacturing a bulb. The method comprises providing a first housing having a first end, a second end and a cavity. The cavity has a first periphery at the first end and a second periphery at the second end. The first periphery is smaller than the second periphery. Differential peripheral parameters of the cavity provide a tapered shape to the cavity. An adapter is provided at the first end of the first housing. The method further comprises providing a second housing. The second housing comprises a third end and a fourth end. The second housing has a third periphery at the third end and fourth periphery at the fourth end. The third periphery is smaller than the fourth periphery. The second housing has a substantially tapered shape and compliments the shape of the cavity. The second housing has a power supply circuit disposed in the second housing. The method also comprises disposing the second housing in the cavity. The method further includes attaching a lighting element at the second end of the first housing, wherein the lighting element is mounted on a printed circuit board. The method includes electrically coupling the lighting element and power supply circuit. The method also includes attaching a diffuser at the second end of the first housing

[0015] The present subject matter further provides a method of manufacturing a bulb assembly. The method includes a step of providing a second housing. The second housing comprises a third end and a fourth end. The second housing has a third periphery at the third end and a fourth periphery at the fourth end. The third periphery is smaller than the fourth periphery. The second housing has substantially tapered shape. The second housing is configured to be disposed in a cavity. The cavity is formed in a first housing. The cavity is substantially tapered in shape. The cavity is configured to substantially encompass the second housing. The method further comprises a step of disposing a power supply circuit in the second housing. According to another feature of the method, the method comprises a step of providing a first set of nodes with the second housing. The first set of nodes comprises at least a first node provided at the third end and at least a second node provided at the fourth end. The method comprises a step of coupling the first node and second node through the power supply circuit. The first node and the second node are coupled through the power supply circuit to establish a current path between the first node and second node through the power supply circuit.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The foregoing and other features and advantages of the present subject matter will be more clearly understood from the following detailed description and the accompanying drawings/ figures, in which:

[0017] FIG.i is a sectional view of a bulb;

[0018] FIG.2(a) shows a schematic diagram of a bulb according to an embodiment of the present subject matter;

[0019] FIG.2(b), FIG.2(c), FIG.2(d) and FIG.2(e) show more details of the bulb according to the embodiment of the present subject matter; [0020] FIG.3 shows a schematic cross sectional view of the bulb according to the embodiment of the present subject matter;

[0021] FIG. if shows a block diagram of a method for manufacturing a bulb according to the present subject matter; and

[0022] FIG.5 shows a block diagram of a method for manufacturing a bulb assembly according to present subject matter.

DESCRIPTION OF THE SUBJECT MATTER

[0023] Before the present subject matter is described in further detail, it is to be understood that the subject matter is not limited to the particular embodiments described, as such may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting, since the scope of the present invention will be limited only by the appended claims. It must be noted that as used herein and in the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise.

[002 ] FIG.i shows a bulb 100. The bulb 100 has an adapter 105, an engager 107, a body 121, a power supply circuit 117, a diffuser 101, a screw 115, a light emitting diode 109 and a printed circuit board 137.

[0025] The bulb 100 is provided with the adapter 105 attached to the body 121. The engager 107 attaches the adapter 105 to a source of power supply external to the bulb 100. The bulb 100 includes the power supply circuit 117. The power supply circuit 117 is in the body 121 of the bulb 100. The power supply circuit 117 is coupled to the printed circuit board 137. The bulb 100 includes the light emitting diode 109. The light emitting diode 109 is mounted on the printed circuit board 137. The light emitting diode 109 is covered with the diffuser 101. The power supply circuit 117 is coupled to the adapter 105 and the printed circuit board 137. The printed circuit board 137 is attached to the diffuser 101 and the body 121 by means of a screw 115.

[0026] Reference is now made to FIG. 2(a) through FIG. 2(e) collectively. In that FIG. 2(a) shows a schematic diagram of a bulb 200 and FIG. 2(b) to FIG. 2(e) show more details of the bulb 200 according to an embodiment of the present subject matter. FIG. 2(b) shows exploded view of a diffuser assembly 207. FIG. 2(c) shows exploded view of a first housing 101. FIG. 2(d) exploded view of a second housing 203. FIG. 2(e) shows exploded view of an adapter 205.

[0027] FIG.2(a) through FIG.2(e) show the bulb 200 having the first housing 201, a first end 211, a second end 221, a cavity 231, a first periphery 251, a second periphery 271, fins 261, threads 281, the second housing 203, a third end 213, a fourth end 223, a third periphery 253, a fourth periphery 263, a power supply circuit 273, a first set of nodes 233, 243, 283, and 293, the diffuser assembly 207, a diffuser 217, a collar 227, threads 237, a printed circuit board 2 7, the adapter 205, an engager 215, a third node 225, heads 235, 245, a lighting element 287, fourth nodes 257, 267 and clamps 277.

[0028] The bulb 200 comprises the first housing 201. The first housing 201 is provided with the first end 211 and the second end 221 and the cavity 231. The first housing 201 is a hollow enclosure that defines the cavity 231 between the first end 211 and the second end 221. The cavity 231 has the first periphery 251 at the first end 211. The cavity 231 has the second periphery 271 at the second end 221. The first periphery 251 is smaller than the second periphery 271. The cavity 231 is a taper shaped cavity. The bulb 200 is provided with the second housing 203. The second housing 203 has the third end 213 and the fourth end 223. The second housing 203 has the third periphery 253 at the third end 213 and the fourth periphery 263 at the fourth end 223. The third periphery 253 is smaller than the fourth periphery 263. The second housing 203 is tapered shaped. Further, the first periphery 251 is smaller than the fourth periphery 263. The taper shape of the cavity 231 limits access of the cavity 231 to certain geometrical objects only. For example, an object may fit at the second end 221 of the cavity 231 however, may not fit or be able to access the first end 211 because size of the first periphery 251 at the first end 211 is smaller than the size of the second periphery 271 at the second end 211. Without prejudice to any shape the first housing 201 may have cylindrical, cubical, hexagonal, any other regular or irregular shape. The second housing 203 is disposed in the cavity 231. According to one possibility the second housing 203 is disposed in the cavity 231 such that the first end 211 of the cavity 231 accommodates the third end 213 of the second housing 203 and the second end 221 of the cavity 231 accommodates the fourth end 223 of the second housing 203. The second housing 203 is disposed in the cavity 231 in a manner that the cavity 231 encompasses the second housing 203 completely so that, the second housing 203 fits into the cavity 231. The second housing 203 may be a tapered columnar shape for example, pyramid shape or any other regular or irregular shape so far as the second housing 203 is insertable in the cavity 231 from only one direction and the cavity 231 is accordingly adapted to accommodate the second housing 203.

[0029] The second housing 203 is provided with the power supply circuit 273. The power supply circuit 273 is disposed in the second housing 203. The second housing 203 is provided with the first set of nodes 233, 2 3, 283 and 293. The first set of nodes 233, 2 3, 283 and 293 comprises first nodes 233, 2 3 provided at the third end 213. The first set of nodes 233, 2 3, 283 and 293 also comprises the second nodes 283, 293 provided at the fourth end 223. The first nodes 233, 2 3 are electrically coupled to the second nodes 283, 293 through the power supply circuit 273. The first nodes 233, 2 3 provide input power to the power supply circuit 273 and output of the power supply circuit 273 is received at the second nodes 283, 293. The first nodes 233, 2 3 are a set of a hole 2 3 and an O-ring 233. The second nodes 283, 293 are a set of two heads, one head 293 being substantially at the center of the fourth end 223 and the other head 283 being substantially away from the center of the fourth end 223. The head 293 is relatively longer than the head 283.

[0030] In one embodiment, any one or both of the first housing 201 and the second housing 203 is made of an electrically non-conductive material. The non-conductive materials may include, but not limited to, the ceramics, composite materials, glass, plastic, carbon fiber etc. In another embodiment any one or both of first housing 201 and the second housing 203 may be made of heat conductive materials. The heat conductive materials may include, but not limited to, metal alloys, aluminum, copper, iron, stainless steel etc. The first housing 201 is provided with a heat sink. The heat sink may be provided with fins 261. According to a further embodiment, the second housing 203 is a heat sink. In yet another embodiment both the first housing 201 is provided with a heat sink. The heat sink may be provided with fins 261. The heat sink may be provided with fins 261. The fins 261 improve the heat sinking capacity. The heat sink is used for sinking heat generated by the bulb 200. According to yet another possibility, the heat sink may be provided with fins 261 comprising of pin fins, straight fins, cross cut fins, flared fins and combinations thereof. [0031] The bulb 200 is further provided with the adapter 205. The adapter 205 is coupled at the first end 211. The adapter 205 comprises the engager 215 and the third node 225. The third node 225 comprises two heads 235 and 2 5. The third node 225 couples to a power source. The power source is external to the bulb 200. The third node 225 is an electrical conductor. The third node 225 pierces through the adapter 205 such that one end of the electrical conductor couples the power source whereas the other end which has heads 235, 2 5 is configured to be disposed in the cavity 231. The head 235 gets disposed substantially at the center of the cavity 231 and the other head 2 5 gets disposed substantially away from the center of the cavity 231. The head 235 is relatively longer than the head 2 5. The second housing 203 fits into the cavity 231 such that the first node 233, 2 3 and heads 235, 2 5 of the third node 225 come in electrical contact with each other. By establishing electrical contact between first node 233, 2 3 and heads 235, 2 5 of the third node 225 the power supply circuit 273 receives input power through the heads 235, 2 5 when the adapter 205 is engaged with the power source. The engager 215 engages the power source and the adapter 205. The engager 215 is a bayonet cap type engager. To engage the adapter 205 and the power source using the bayonet cap type engager, the bulb 200 is pushed and twisted. In another embodiment the engager 215 is an Edison screw type engager. To engage the adapter 205 using Edison screw type engager, the bulb 200 is screwed to engage the adapter and the power source. The engager 215 engages the power source and the adapter 205 such that the third node 225 is in electrical contact with the power source. It would further become apparent to a person skilled in the art, after reading this specification that other configuration of the engager 215 and the adapter 205 are possible that enables engaging of the power source and the adapter 205.

[0032] The bulb 200 comprises the diffuser assembly 207. The diffuser assembly 207 includes the diffuser 217. The diffuser assembly 207 is provided with the collar 227. The collar 227 has threads 237. The diffuser 217 is configured to be attached to the second end 221 of the first housing 201 with the help of the collar 227 and the threads 237. The first housing 201 is provided with complementary threads 281 at the second end 221 to screw the diffuser assembly 207 at the second end 221. Although, in this embodiment the diffuser assembly 207 is provided with the collar 227 and threads 237, however, it shall become clear, after reading this specification, that in some embodiments the diffuser assembly 207 may be press fitted at the second end 221. The diffuser assembly 207 is further provided with the printed circuit board 2 7 clamped in the diffuser assembly 207. In this embodiment the printed circuit board 2 7 is clamped in the diffuser assembly 207 using the clamps 277. Although, the printed circuit board 2 7 is shown to be clamped in the diffuser assembly 207 in this embodiment, however, it shall become clear after reading this specification, that in some embodiments the printed circuit board 2 7 may be directly screwed or press fitted at the second end 221 and the diffuser assembly 207 or the diffuser 217 may be attached at the second end 221 on the printed circuit board 2 7. The printed circuit board 2 7 includes the fourth nodes 257, 267. The fourth nodes 257, 267 are a set of a hole 257 and an O-ring 267. The fourth nodes 257, 267 are configured to be detachably in contact with the second node 283, 293. Upon mounting the diffuser assembly 207 at the second end 221, the fourth nodes 257, 267 come in electrical contact with the second node 283, 293 such that, the head 293 gets inserted in the hole 257 and the head 283 touches the O-ring 267. The lighting element 287 is mounted on the printed circuit board 2 7. The lighting element 287 is a light emitting diode. The lighting element 287 is in electrical contact with the fourth nodes 257, 267 and receives electrical energy through the fourth nodes 257, 267. The diffuser 217, when mounted on the collar 227 encompasses the lighting element 287. The diffuser 217 is configured to diffuse light emitted by the lighting element 287 when the lighting element 287 is energized.

[0033] The bulb 200 is assembled by attaching the adapter 205 at the first end 211 of the first housing 201. The adapter 205 is generally attached to the first housing 201 in factory setting. Geometry of the bulb 200 would not require the adapter 205 to be detached for removing the second housing 203. The adapter 205 may be attached to the first end 211 permanently or in a manner that the adapter 205 and the first end 211 are not detachable by an end user/layman or consumer of the bulb 200. That is, the adapter 205 and the second end 221 are detachable only in a factory setting or at a repair shop. However, a person in the art shall appreciate, after reading this specification, that a bulb may be made, sold and used without departing from the scope of this subject matter, in which the adapter 205 and the second end 211 are detachable by a layman or consumer. Restricting detachment of the adapter 205 and the first end 211 reduces possibility of damaging the bulb 200. In one possibility, the adapter 205 may be glued to the first end 211. G lue or any other fastener for attaching the adapter 205 to the first end 211 is selected so that detaching of the adapter 205 from the first end 211 may be carried out only in a factory setting. The second housing 203 is now disposed in the cavity 231. The third end 213 of the second housing 203 is inserted into the cavity 231 of the first housing 201 through the second end 221. Because of the peripheral constraints of the first end 211, the second end 221, the third end 213 and the fourth end 223, geometry of the second housing 203 and the cavity 231 are such that the third end 213 is insertable into the cavity 231 through the second end 221 to appropriately fit the second housing 203 into the cavity 231. Disposing the second housing 203 into the cavity 231 may be carried out at a factory setting or by an end user/layman or a consumer of the bulb 200. Disposing the second housing 203 into the cavity 231 brings the heads 235 and 2 5 of the third nodes 225, and the heads 235 and 2 5 in electrical contact with the first nodes 233, 2 3. The head 235 gets inserted into the hole 2 3 and the head 2 5 gets electrically coupled to the O-ring 233. Electrical connection between the third node 225, the heads 235 and 2 5 and the first nodes 233, 2 3 establishes a current path between the third node 225 and the second nodes 283, 293 through the power supply circuit 273. Once the second housing 203 is inserted into the cavity 231, the diffuser assembly 207 is mounted on the second end 221 using the threads 237 and 281. Mounting the diffuser assembly 207 on the second end 221 brings the fourth nodes 257, 267 in electrical contact with the second nodes 283, 293. The head 293 gets inserted into the hole 257 and the head 283 gets electrically coupled to the O-ring 267. When the adapter 205 is engaged to the power source using the engager 215, the third nodes 225, the heads 235 and 2 5 come in electrical contact with the power source. Electrical connection between the first node 233, 2 3, the third node 225, the heads 235 and 245, the fourth node 257, 267 and the second node 283, 293 establishes a current path between the power source and the lighting element 287 through the power supply circuit 2 7 to energize the lighting element 287.

[003 ] The power supply circuit 273 receives power from the power source through the third node 225, the heads 235 and 2 5 and the first nodes 233, 2 3 and converts it into a form suitable to energize the lighting element 287. I n one embodiment the power supply circuit 273 is a rectifier. The rectifier yields a unidirectional but pulsating direct current, that is, the rectifier receives alternating current and converts the Alternating Current (AC) into Direct Current (DC). I n another embodiment the power supply circuit 273 is a half wave rectifier. In a further embodiment the power supply circuit 273 is a full-wave rectifier. In some embodiments the power supply circuit 273 includes a voltage converter. In some embodiments the voltage converter converts high voltage to low voltage. I n some other embodiments the voltage converter converts low voltage to high voltage. In some embodiments the power supply circuit 273 is a DC to DC converter and in some other embodiment the power supply circuit 273 is an AC to AC converter. I n some embodiments the power supply circuit 273 is an AC to DC converter and in some other embodiment the power supply circuit 273 is a DC to AC converter. I n an embodiment the power supply circuit 273 includes a power factor circuit. The power supply circuit 273 provides its output at the second nodes 283, 293. Because the fourth nodes 257, 267 are in electrical contact with the second nodes 283, 293 and the lighting element 287 is in electrical contact with the fourth nodes 257, 267, a current path is established between the lighting element 287 and the power source. The lighting element 287 receives the output power of the power supply circuit 273 and gets energized when the bulb 200 is engaged to the power source through the adapter 205.

[0035] It would become apparent to a person skilled in the art, after reading this specification, that the first node 233,2 3 the second node 243, the third node 225, and the heads 235, 245 and fourth node 257, 267 each may have more than one electrical contact points required for establishing the current path. I n another possibility, any one or more of the first node 233,243, the second node 283, 293, the third node 225, the heads 235, 245 and fourth node 257, 267 may be a head, a hole, an O-ring, a combination of a hole or CD- ring or any other electrical node or contact point. In one example, the first node 233, 243 is a head. In another example the first node 233, 243 is a hole. In a further example, the first node 233, 243 is an O-ring. Similarly, in a further example the heads 235, 245 could be Curings. The heads 235, 245 may be a head, an O-ring or any other electrical contact or socket. It would become apparent to a person skilled in the art, after reading this specification, that other configurations of the first node 233, 243 the second node 283, 293, the third node 225, heads 235, 245 and the fourth node 257,267 are possible.

[0036] In one possibility the bulb 200 is provided with a spring. The spring may be disposed in the cavity 231. The spring is configured to snug fit the second housing 203 in the cavity 231. In one possibility the spring may be provided with the first node 233, 2 3. In another possibility the spring may be provided with the second node 283, 293. In a further possibility, the spring may be provided along the walls of the cavity 231. In yet another possibility, the spring may be provided with the second housing 203. In a further possibility, the spring may be provided along the walls of the second housing 203.

[0037] The present subject matter also provides a bulb assembly. The bulb assembly comprises the second housing 203. The power supply circuit 273 is disposed in the second housing 203. Further, electrical connection is established between the first nodes ² 33 _/ ² 3 and ^tne second nodes 283, 293 through the power supply circuit 273, thereby establishing a current path between the first nodes 233, 2 3 and the second nodes 283, 293 through the power supply circuit 273.

[0038] FIG.3 shows a schematic cross sectional view of the bulb 200. The bulb 200 has the diffuser assembly 207 attached to the second end 221 of the first housing 201. The diffuser assembly 207 has the diffuser 217. The diffuser 217 is attached to the second end 221 using the collar 227. The diffuser assembly 207 includes the printed circuit board 2 7. One or more lighting elements 287 are mounted on the printed circuit board 2 7. The printed circuit board 2 7 is provided with the fourth nodes 257, 267. The fourth nodes 257, 267 are in contact with the second nodes 283, 293. The second nodes 283, 293 are provided at the fourth end 223 of the second housing 203. The second housing 203 is provided with the first nodes 233, 2 3 at the third end 213 of the second housing 203. The power supply circuit 273 is disposed in the second housing 203. The first nodes 233, 2 3 and the second nodes 283, 293 are electrically coupled through the power supply circuit 273. The second housing 203 is disposed in the cavity 231. The cavity 231 is in the first housing 201. The first housing 201 is coupled to the adapter 205 at the first end 211. The adapter 205 has the third node 225. The third node 225, heads 235 and 2 5 are coupled to the first nodes 233, 2 3. The third node 225, head 235, 2 5 are also configured to be coupled to the power supply. The adapter 205 is provided with the engager 215 that engages the bulb 200 with the power source.

[0039] FIG. ^ shows a block diagram 400 of a method for manufacturing bulb according to the present subject matter. According to the method 400, at block 401 a first housing having a first end, a second end and a cavity is provided. The cavity has a first periphery at the first end and a second periphery at the second end. The first periphery is smaller than the second periphery, thereby providing tapered shape to the cavity, and an adapter is provided at the first end of the first housing. At block 03 a second housing is provided. The second housing comprises a third end and a fourth end. The second housing has a third periphery at third end and fourth periphery at the fourth end. The third periphery is smaller than fourth periphery. The second housing is substantially taper shaped and compliments the shape of the cavity. The second housing has a power supply circuit disposed in the second housing. At block 405 the second housing is disposed in the cavity. At block 407 a lighting element is attached at the second end of the first housing, wherein the lighting element is mounted on a printed circuit board. At block 409 a diffuser is attached at the second end of the first housing.

[00 0] FIG.5 shows a block diagram 500 of a method for manufacturing a bulb assembly according to present subject matter. According to the method 500, at block 501 a second housing is provided. The second housing comprises a third end and a fourth end. The second housing has a third periphery at the third end and a fourth periphery at the fourth end. The third periphery is smaller than the fourth periphery. The second housing has substantially tapered shape. The second housing is configured to be disposed in a cavity, wherein the cavity is formed in a first housing. The cavity is substantially tapered in shape. The cavity is configured to substantially encompass the second housing. At block 503 a power supply circuit is disposed in the second housing. According to another feature of the method 500, at block the 511 a first set of nodes are provided with the second housing. The first set of nodes comprises at least a first node provided at the third end and at least a second node provided at the fourth end. At block 513 a current path is established between the first node and second node through the power supply circuit.

[00 1] While the subject matter may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and have been described herein. Alternate embodiments or modifications may be practiced without departing from the spirit of the present subject matter. The drawings shown are schematic drawings and may not be to the scale. While the drawings show some features of the subject matter, some features may be omitted. Alternatively, in some other cases some features may be emphasized while others are not. Further, the methods disclosed herein may be performed in manner and/or order in which the methods are explained. Alternatively, the methods may be performed in manner or order different than what is explained without departing from the spirit of the present subject matter. It should be understood that the subject matter is not intended to be limited to the particular forms disclosed. Rather, the subject matter is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the subject matter as defined by the following appended claims.