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. The present subject matter provides a replaceable power supply circuit with the bulb. 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 the 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 a layman or a consumer can access to the power supply circuit upon dismantling the bulb. 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 ensures 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. This solution not only optimizes the 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 has a first end and 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.

[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 is disposed in the cavity. The second housing is insertable in the cavity through the second end. In an embodiment, the third end is insertable in the cavity through the second end. The second housing is provided with a power supply circuit. The power supply circuit is disposed in the second housing. The second housing is provided with a first node provided at the third end and 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 an input power to the power supply circuit and the output of the power supply circuit is received at the second node.

[008] According to one embodiment, the first housing may be a heat sink. According to one embodiment the first housing may have a heat sink. According to another embodiment, the second housing may be a heat sink. According a further embodiment the second housing may have a heat sink. In yet another embodiment, any one or both, the first housing and the second housing may be the heat sink.

[009] In one embodiment, the bulb may be provided with an adapter coupled at the first end. The adapter comprises an engager and a third node. The third node is configured to be detachably coupled to the first node. The engager is configured to engage the adapter and the power source. The power source is external to the bulb.

[0010] 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 is provided with 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 coupled at the second end 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 printed circuit board comprises a fourth node and the fourth node is configured to be detachably coupled to the second node. 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 node and the second node are configured to establish a current path through the power supply circuit to energize the lighting element. According to one feature of the present subject matter, the third node is configured to electrically couple the lighting element and the power source to establish a current path between the lighting element and the power source. The third node and the lighting element are coupled through the power supply circuit. Electrically coupling the lighting element and the power source energizes the lighting element.

[0011] 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.

[0012] The present subject matter further provides a bulb assembly. The bulb assembly comprises a second housing. The second housing is columnar shaped. In an embodiment, the second housing may be cylindrical. In another embodiment, the second housing may be cuboidal in shape. The second housing comprises a third end and a fourth end. The second housing is configured to be disposed in a cavity. The cavity is formed in a first housing of the bulb and 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.

[0013] According to another possibility, the second housing is provided with a first node and 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 coupled 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. 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, and a power supply circuit is disposed in the second housing. According to another feature of the subject matter, the method includes disposing the second housing in the cavity. The method includes attaching a lighting element at the second end of the first housing. The lighting element is mounted on a printed circuit board. The method further includes coupling the lighting element and a third node through the power supply circuit. The third node is provided with the adapter. The method further comprises attaching a diffuser at the second end of the first housing.

[0015] According to another feature, the present subject matter provides a method of manufacturing a bulb assembly. The method comprises providing a second housing. The second housing comprises a third end and a fourth end. The second housing is configured to be disposed in a cavity. The cavity is formed in a first housing and the first housing is configured to substantially encompass the second housing. The method further includes disposing a power supply circuit in the second housing. The method further comprises providing a first node and a second node with the second housing. The first node is provided at the third end and the second node is provided at the fourth end. The method includes coupling the first node and second node through the power supply circuit.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The foregoing and other features of the present subject matter will be more clearly understood from the following detailed description and the accompanying 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. shows a block diagram of a method for manufacturing 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 the 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.

[0024] 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 the screw 115.

[0026] Reference is now made to FIG. 2(a) through FIG. 2(e) collectively. Reference is now made to FIG. 2(a) through FIG. 2(e) collectively. In that FIG.2 (a) being a schematic diagram of a bulb 200 and FIG.2 (b), FIG.2(c), FIG. 2(d) and FIG. 2(e) show more details of the bulb 200. 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, fins 261, threads 281 provided with the second end 221, the second housing 203, a third end 213, a fourth end 223, a power supply circuit 273, ^a fi ^{rst n} °de 233, 2 3, a second node 283, 293, the diffuser assembly 207, a diffuser 217, a collar 227, threads 237 provided with collar 227, a printed circuit board 2 7, the adapter 205, an engager 215, a third node 225, heads 235, 2 5, a lighting element 287, a fourth node 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 first housing 201 is provided with a heat sink. The heat sink may be provided with fins 261. The first housing 201 may have cylindrical, cubical, hexagonal or any other regular or irregular shape.

[0029] 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 has the heads 235, 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 that runs through the adapter 205. The adapter is coupled at the first end 211 such that one end of the third node 225 which has the heads 235, 2 5 are disposed in the cavity 231, whereas the other end is exposed outside of the bulb 200. The exposed end of the third node 225 couples to the power source. 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 engager 215 is configured to engage the adapter 205 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. I n one embodiment, the engager 215 is a bayonet cap type engager. To engage the adapter 205 to 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 215 and the power source. It becomes 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 adapter 205. [0030] 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 a columnar shape. I n an embodiment, the second housing 203 is cylindrical. 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 node 233, 2 3 provided at the third end 213 and the second node 283, 293 provided at the fourth end 223. The first node 233, 2 3 is electrically coupled to the second node 283, 293 through the power supply circuit 273. The first node 233, 2 3 provides an input power to the power supply circuit 273 and the output of the power supply circuit 273 is received at the second node 283, 293. The first node 233, 2 3 is a set of a hole 2 3 and an O-ring 233. The second node 283, 293 is 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. The second housing 203 is disposed in the cavity 231. According to one feature, the third end 213 is insertable in the cavity 231 through the second end 221 to dispose the second housing 203 in the cavity 231 and fit the second housing 203 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 accommodates the fourth end 223. The second housing 203 is disposed in the cavity 231 in a manner that the cavity 231 encompasses the second housing 203 completely, that is, the second housing 203 fits into the cavity 231 and the first node 233, 2 3 and the heads 235, 245 come in electrical contact with each other. The heads 235, 2 5 are configured to be detachably coupled to the first node 233, 2 3. By establishing electrical contact between the first node 233, 2 3 and the heads 235, 2 5 the power supply circuit 273 receives input power through the heads 235, 2 5 when the adapter 205 is engaged with the power source.

[0031] 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 embodi ments the diffuser assembly 207 may be press fitted at the second end 221 or the diffuser 217 and the second end 223 are provided with threads and the diffuser 217 is fitted at the second end 223 using threads. The diffuser assembly 207 is further provided with the printed circuit board 2 7 clamped in the diffuser assembly 207. I n 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 in 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 node 257, 267. The fourth node 257, 267 is a set of a hole 257 and an O-ring 267. The fourth node 257, 267 is configured to be detachably in contact with the second node 283, 293. U pon mounting the diffuser assembly 207 at the second end 221, the fourth node 257, 267 comes in electrical contact with the second node 283, 293 such that, the head 293 gets inserted in the coupling the lighting element and a third node through the power supply circu it, wherein the third node is provided with the adapter; and 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 node 257, 267 and receives electrical energy through the fourth node 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.

[0032] 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. Because, the bulb 200 is provided with a geometry that would not require the adapter 205 to be detached for replacing the second housing 203 and thereby enabling replacement of the power supply circuit 273. 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 211 are detachable only in a factory setting or at a repair shop. I n one embodiment, the adapter 205 and the second end 211 may be detachable by a layman or consumer. Restricting detachment of the adapter 205 and the first end 211 reduces possibility of damaging the bulb 200. I n 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. 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, 2 5 of the third node 225 in electrical contact with the first node 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 heads 235, 2 5 of the third node 225 and the first node 233, 2 3 establishes a current path between the heads 235, 2 5 of the third node 225 and the second node 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 node 257, 267 in electrical contact with the second node 283, 293. The head 293 gets inserted into the hole 257 and the head 283 gets electrically coupled to the O-ring 267. Electrical connection between the fourth node 257, 267 and the second node 283, 293 establishes a current path between the third node 225 , heads 235 and 2 5 and the fourth node 257, 267 through the power supply circuit 273. When the adapter 205 is engaged to the power source, the third node 225 comes in electrical contact with the power source and receives input power from the power source. The input power is transmitted to the power supply circuit 273. A complete electrical current path is established between the third node 225, the first node 233, 2 3, the power supply circuit 273, the second node 283,293, the fourth node 257, 267 and the lighting element 287. When the adapter 205 is attached to the power source using the engager 215, the third node 225 comes into electrical contact with the power source and receives electrical power which energizes the lighting element 287. Effectively, the third node 225, the first node 233, 2 3, the power supply circuit 273, the second node 283,293, and the fourth node 257, 267 facilitate establishing a current path to energize the lighting element 287,

[0033] The power supply circuit 273 receives power from the power source through the heads 235, 2 5 of the third node 225 and the first node 233, 2 3 and converts it into a form suitable to energize the lighting element 287. In 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). In 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. In 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. In 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. In an embodiment, the power supply circuit 273 includes a power factor circuit. The power supply circuit 273 provides its output at the second node 283, 293. Because the fourth node 257, 267 is in electrical contact with the second node 283, 293 and the lighting element 287 is in electrical contact with the fourth node 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.

[003 ] According to another embodiment, the first node 233, 2 3 and the second node 283, 293 may include one or more heads and holes. The head may be insertable in the hole. According to another possibility, any one or more of the first node 233, 2 3 and the second node 283, 293 may comprise an O-ring. In another possibility, the second node 283, 293 is an O-ring and a fourth node 257, 267 is coupled to the O-ring.

[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 283,293 the third node 225 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 the first node 233,2 3 the second node 283,293 the third node 225 and fourth node 257, 267 may have a head, a hole, an O-ring, a socket or any other electrical node or contact point. In one example, the first node 233, 2 3 is a head and the heads 235, 2 5 are holes and the head is inserted into the holes to electrically couple the first node 233, 2 3 and the third node 225 to establish the current path. In another example the first node 233, 2 3 is a hole. In a further example, the first node 233, 2 3 is an O-ring. Similarly, in a further example the heads 235, 2 5 are O- rings. Similarly, heads 235, 2 5 may be a head, an O-ring or any other electrical contact arrangement or socket. It would become apparent to a person skilled in the art, after reading this specification, that other examples of the first node 233, 2 3 second node 283,293, third node 225, heads 235, 2 5 and fourth node 257, 267 are possible. In one possibility, the bulb is provided with a spring. The spring is disposed in the cavity. The spring is configured to snug fit the second housing in the cavity. In one possibility, the spring may be provided with the first node. In another possibility, the spring may be provided with the second node. In a further possibility, the spri ng may be provided on the internal wall of the first housing. In yet another possibility, the spring may be provided on the external wall of the second housing.

[0036] I n 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. I n another embodiment, any one or both of the fi rst 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, aluminu m, copper, iron, stainless steel etc. The heat sink may be provided with fins 261. The fins improve the heat sinking capacity. The heat sink is used for sinking heat generated by the bulb. 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.

[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 node ² 33 _/ ² 3 ^ar| d the second node 283, 293 through the power supply circuit 273, thereby establishing a current path between the first node 233, 2 3 and the second node 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 node 257, 267. The fourth node 257, 267 is in contact with the second node 283, 293. The second node 283, 293 is provided at the fourth end 223 of the second housing 203. The second housing 203 is provided with the first node 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 node 233, 2 3 and the second node 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 has two heads 235, 2 5 which are coupled to the first node 233, 2 3. The third node 225 is 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. 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 is columnar in shape and compliments the shape of the cavity. In an embodiment, the second housing is cylindrical. 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 07 a lighting element is attached at the second end of the first housing, wherein the lighting element is mounted on a printed circuit board. The lighting element is coupled to a third node through the power supply circuit, wherein the third node is provided with the adapter. At block 09 a diffuser is attached at the second end of the first housing. [oo jo] 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 columnar shape. In an embodiment, the second housing is cylindrical. The second housing is configured to be disposed in a cavity, wherein the cavity is formed in a first housing. 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 node is provided at the third end and at least a second node is 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.

[oo ji] 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.