KR101675057B1 - Eco-friendly led lamp with improved efficiency of heat radiation - Google Patents

Eco-friendly led lamp with improved efficiency of heat radiation Download PDF

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Publication number
KR101675057B1
KR101675057B1 KR1020150085557A KR20150085557A KR101675057B1 KR 101675057 B1 KR101675057 B1 KR 101675057B1 KR 1020150085557 A KR1020150085557 A KR 1020150085557A KR 20150085557 A KR20150085557 A KR 20150085557A KR 101675057 B1 KR101675057 B1 KR 101675057B1
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South Korea
Prior art keywords
oil
weight
leds
led lamp
heat sink
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KR1020150085557A
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Korean (ko)
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윤태윤
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대영엔지니어링 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F21S2/005—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • F21V19/003—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Biological Depolymerization Polymers (AREA)

Abstract

The present invention relates to an LED lamp. The LED lamp includes: a PCB substrate on which a plurality of LEDs are mounted; a heat sink which discharges the heat from the plurality of the LEDs to the outside; a base which receives power form the outside and delivers the power to the PCB substrate; and a diffuser cover which is formed in front of the PCB substrate on which the plurality of the LEDs are mounted and diffuses the light emitted from the LED. The head sink contains: (A) 65-80 weight percent of biodegradable polymer in which poly lactic acid (PLA) and poly butylene succinate (PBS) are melted and blended; (B) 5-20 weight percent of PLA crystallization core agent where 10 - 20 weight percent of oil which is selected from a group composed of soybean oil, corn oil, castor oil, palm oil, coconut oil, and sunflower oil or in which two or more from the group are mixed and 89-90 weight percent of biotite are mixed; (C) 5-10 weight percent of phase change material microcapsule powder; and (D) 5-20 weight percent of carbon nanotube composites.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an eco-friendly LED lamp having improved heat dissipation,

The present invention relates to an environmentally friendly LED lamp with improved heat dissipation.

LED lamps have recently been in demand due to their low power consumption, excellent electrical response characteristics, and long life span. However, the heat generated by the LED lamps is directed toward the inside of the module. Therefore, it is important to use a heat dissipation technology that allows the heat to be quickly discharged to the outside. In this case, the heat sink is used.

  Conventional heat sinks for LED lamps are mainly made of aluminum. When they are applied to outdoor LED products, they can be oxidized in acid rain and natural environment. In addition, the insulation coating peeling that may be caused by surface scratches during the fixing operation of the LED luminaire is vulnerable to lightning such as thunderstorms, which may cause failure of SMPS and LED chips. Aluminum heat sinks are heavy in weight and may require increased surface costs due to the need for surface preparation to bond to the instrument and LED PCB substrate.

 On the other hand, polylactic acid (PLA), which is typically used as a biodegradable polymer decomposed by the action of naturally occurring microorganisms, is an eco-friendly resin having general physical properties as well as crystallinity, biocompatibility, Range of plastic products. However, when it is blended with polybutylene succinate (PBS) having high impact strength because of a disadvantage that the impact strength is weak, it is difficult to use it in a wide composition range due to lack of compatibility.

 Accordingly, there is a demand for an LED heat sink using biodegradable composite plastic which is harmless to the human body and nature, not only securing price stability but also improving heat radiation.

Korean Patent No. 10-756897

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an LED lamp that is improved in heat dissipation and is environmentally friendly.

According to an aspect of the present invention, there is provided an LED lamp comprising: a PCB substrate on which a plurality of LEDs are mounted; a heat sink for emitting heat generated from a plurality of LEDs to the outside; And a diffuser cover formed on a front side of a PCB substrate to which a plurality of LEDs are attached and diffusing light emitted from the LEDs, wherein the heat sink comprises: (A) a polylactic acid (PLA) 65 to 80% by weight of a biodegradable polymer obtained by melt-blending poly (butylene succinate) (PBS) (B) from the group consisting of soybean oil, corn oil, castor oil, palm oil, coconut oil, sunflower oil and palm oil 5 to 20% by weight of a PLA crystallization nucleating agent composed of 10 to 20% by weight of an oil and 80 to 90% by weight of a biotite mixed with one or more selected (C) PCM capsules (Phase Change Material Microcapsul ) Powder 5 to 10% by weight (D) CNT ( And 5 to 20% by weight of a carbon nanotube nanocomposite.

And a conductor disposed between the PCB substrate and the heat sink to which a plurality of LEDs are attached in order to dissipate heat generated from the plurality of LEDs.

The heat sink is elongate and hollow in the center and the conductor has a cylindrical first portion contacting the inner surface of the heat sink and a second portion connected to the first portion and disposed parallel to the PCB substrate .

The conductor may be made of aluminum.

The biodegradable polymer may further comprise polybutylene adipate-co-terpolate (PBAT).

The biodegradable polymer comprises 80 to 90% by weight of polylactic acid (PLA), 5 to 15% by weight of polybutylene succinate (PBS) and 0 to 10% by weight of polybutylene adipate-co-terapalate (PBAT) can do.

The PCM capsule powder may have an average particle size of 3-6 [mu] m.

According to the present invention, there is provided an environmentally-friendly LED lighting with improved heat dissipation.

1 is a perspective view of an LED lamp according to an embodiment of the present invention.
2 is an exploded perspective view of an LED lamp according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the technical concept of the present invention, are incorporated in and constitute a part of the specification, and are not intended to limit the scope of the present invention.

1 is a perspective view of an LED lamp according to a first embodiment of the present invention. 1, the LED lamp according to the present invention includes a light emitting diode (LED) 10 as a light source, and includes a diffuser cover 11 for diffusing LED light, an LED And a base 17 connected to the heat sink 13 to help the external power source to be energized. As shown in FIG.

Hereinafter, the structure of the LED lamp according to the present invention will be described in detail with reference to FIG.

2 is an exploded perspective view of the LED lamp according to the first embodiment of the present invention.

The LED lamp according to the present invention includes a plurality of LEDs 10, a PCB substrate 17 on which a plurality of LEDs 10 are mounted, and a plurality of LEDs 10 mounted on the PCB substrate 17, A base 15 connected to the heat sink 13 for receiving power from the outside and transmitting the power to the PCB substrate 17 and a PCB 10 having a plurality of LEDs 10 mounted thereon, And a diffuser cover (10) formed on the front of the substrate (17) for diffusing light of the LED (10). In order to dissipate the heat generated from the plurality of LEDs 10, a PCB 19 having a plurality of LEDs 10 mounted thereon and a conductor 19 disposed between the heat sinks 13 .

Here, the plurality of LEDs 10 are placed on the PCB substrate 17 and are formed by forming a kind of light source module and assembling it to the heat sink 13. [ At this time, the plurality of LEDs 10 are arranged circularly on the PCB substrate 17, and the position and the number of the LEDs 10 are not limited, and other embodiments may be used.

The diffuser cover 11 is generally formed in a dome shape and is coupled to the heat sink so as to cover the LED so as to compensate the straightness characteristic of the LED to diffuse the light at various angles.

Here, the diffuser cover 11 may be manufactured using a transparent glass-based or resin-based glass. Preferably, polycarbonate is used as the material.

Polycarbonate is an optical thermoplastic (polyester) having a carbonate bond formed by the condensation reaction of a hydroxy compound and carbonic acid, and is characterized by impact resistance, heat resistance, weather resistance, self-extinguishing property, transparency , And has excellent flexibility and processability. Therefore, the diffusion bulb manufactured through such a polycarbonate can easily prevent the glare together with the diffusion effect of light.

The LED (10) lamp according to the present invention may further include a conductor (19) formed of aluminum to dissipate heat generated from the plurality of LEDs (10). The conductor 19 in the present invention is formed of aluminum, but is not limited to a material having heat dissipation characteristics.

The conductor 19 includes a first portion in the form of a cylinder that contacts the inner surface of the heat sink 13 and a second portion connected to the first portion and disposed in parallel with the PCB substrate 17 . That is, the heat emitted from the LED 10 is transmitted to the first part of the conductor 19 through the second part of the conductor 19, which is transmitted to the heat sink 13 in contact with the first part And is radiated to the outside.

The heat sink 13 according to the present invention is elongate and has an inner surface that is hollow to allow contact with the second portion of the conductor 19. Further, a plurality of heat radiation fins are formed in the longitudinal direction along the outer circumference of the heat sink 13, so that the heat generated from the LED 10 can be dissipated into the atmosphere. Such a shape of the heat dissipation fin has the effect of increasing the surface area of the heat sink 13 and increasing the heat dissipation performance.

Although not shown, the LED lamp according to the present invention includes a wire that is connected to the PCB substrate 17 through the base 15 and through the empty space of the heat sink 13. [ The base 15 is supplied with power from the outside and can transmit the electric power to the PCB substrate 17 and the LED 10 through the electric wire.

Hereinafter, a method of manufacturing the heat sink 13 applied to the LED lamp according to the present invention will be described in detail.

The heat sink 13 according to the present invention comprises (A) 65 to 80% by weight of a biodegradable polymer obtained by melt-blending polylactic acid (PLA) and polybutylene succinate (PBS); (B) 10 to 20% by weight of oil consisting of one or more kinds of oils selected from the group consisting of soybean oil, corn oil, castor oil, palm oil, coconut oil, sunflower oil and palm oil, and 80 to 90 weight% of biotite 5% to 20% by weight of a PLA crystallization nucleating agent constituted by a blend of% (C) 5-10 wt% of PCM capsules (Phase Change Material Microcapsul) powder; And (D) 5 to 20% by weight of carbon nanotube (CNT) nanocomposite.

At this time, the biodegradable polymer (A) used in the present invention is obtained by melt-blending polylactic acid (PLA) and polybutylene succinate (PBS). In this case, the melt blending is preferably carried out at 175 to 180 ° C for 30 to 60 seconds at a stirring speed of 70 to 150 rpm.

 The biodegradable polymer is preferably used in an amount of 70 to 85% by weight. When the biodegradable polymer is less than 70% by weight, miscibility with other components is poor. When the biodegradable polymer is more than 85% by weight, mechanical and physical properties may be deteriorated.

In addition, the biodegradable polymer is preferably used by mixing 80 to 90% by weight of polylactic acid (PLA) and 10 to 20% by weight of polybutylene succinate (PBS). When the content of polybutylene succinate is less than 10% by weight, the impact strength is lowered. When the content is more than 20% by weight, the polylactic acid and the polylactic acid become less usable.

The biodegradable polymer may further include polybutylene adipate-coterephalate (PBAT) as a biodegradable material to improve impact strength and heat resistance. At this time, the biodegradable polymer comprises 80 to 90% by weight of polylactic acid (PLA), 5 to 15% by weight of polybutylene succinate (PBS) and 0 to 10% by weight of polybutylene adipate-co-teraprylate It is recommended to mix them. Particularly, when the PBAT is more than 10% by weight, the impact strength and the heat resistance property become too high, and there is a limitation in producing a desired heat sink.

The PLA crystallization nucleating agent (B) to be used in the present invention is 10 to 20% by weight of an oil composed of one or more kinds of oils selected from the group consisting of soybean oil, corn oil, castor oil, palm oil, coconut oil, sunflower oil, And 80 to 90% by weight of biotite. At this time, the mixing temperature is preferably from 1,000 to 1,500 rpm at 150 to 220 ° C.

 Phase change material microcapsul powder (C) used in the present invention is a phase transition material and is formed of a material which is repeatedly changed into solid, molten, absorbing heat energy, liquid, condensation, thermal energy release, and solid. It has properties such as ionic dissociation, anion resin, convection, heat dispersion / diffusion, base coating dispersibility / diffusivity of heat dissipation coating solution and so on.

Therefore, it is preferable that the PCM capsule powder of the present invention use 5 to 10% by weight of those having an average particle size of 3 to 6 탆. When the average particle size is less than 3 占 퐉 and the usage amount is less than 5% by weight, there is a problem in heat dispersion and diffusion. When the average particle size is more than 6 占 퐉 and the usage amount is more than 10% It is preferable to use it within the above range.

The CNT (Carbon nanotube) nanocomposite (D) used in the present invention plays a role of facilitating the radiative thermal conductivity of the LED heat sink and the movement of electrons. The CNT nanocomposite is preferably used in an amount of 5 to 20% by weight based on the total weight of the composite plastic composition. If the carbon nanotubes are less than 5% by weight, there is a problem of heat dissipation due to a problem of electric electron emission due to a high electric resistance. When the carbon nanotubes are more than 20% by weight, .

The biodegradable composite plastic composition used in the LED lamp of the present invention can provide the environmentally-friendly LED heat sink 13, dramatically improving the mass productivity even in a small volume, and dramatically increasing the thermoelectronic air discharge performance, And cost reduction effect.

Hereinafter, examples and comparative examples of the heat sink 13 of the LED lamp according to the present invention will be described by preparing a heat sink specimen after forming the biodegradable polymer according to the above description. However, these examples are for illustrating the present invention, and the scope of the present invention is not limited thereto.

Experimental Examples 1 to 2 and Comparative Examples 1 to 3

The biodegradable polymers shown in the following Table 1 were mixed according to the contents and ingredients shown in Table 2 below to form a composite plastic resin. This was molded and injected to prepare a composite plastic heat sink 13 specimen.

Figure 112015058317363-pat00001

Figure 112015058317363-pat00002

Experimental Example: Measurement of Physical Properties

The physical properties shown in Table 3 below are the average values except for the upper and lower limits of five specimens measured, and the test method is as follows.

(1) Izod Impact Strength: Measured according to ASTM D256. The specimen thickness was 6.3 mm and notched using a notch. The measurement unit was kgfcm / cm.

(2) Emissivity measurement: The falling rate of the temperature at the reference temperature was measured.

(3) Measurement of thermal conductivity: Measured according to KSL 1604. The measurement unit was W / mK.

Figure 112015058317363-pat00003

Therefore, as shown in Table 3, the biodegradable composite plastic composition used in the LED lamp of the present invention satisfies the impact strength by mixing the biodegradable polymer with a proper amount of the nucleating agent, the PCM capsule powder and the CNT nanocomposite, By providing this excellent composite plastic composition, the temperature of the LED lamp can be efficiently discharged to the outside, which can prevent the thermal shock and prolong the lifetime of the LED.

In other words, the PCM capsule powder and the CNT nanocomposite used in the heat sink 13 of the present invention play a major role in increasing the thermal conductivity, and the biodegradable polymers such as polylactic acid (PLA) and polybutylene succinate (PBS) The impact strength can be improved by selectively inserting polybutylene adipate-co-terpolate (PBAT), and polybutylene adipate-co-terpolate (PBAT) further improves heat resistance.

Therefore, the heat sink 13 manufactured using the biodegradable composite plastic composition according to the present invention and the LED using the heat sink 13 have a limited deformation due to thermal shock and can be easily attached to the LED due to its low specific gravity.

The polylactic acid (PLA) material of the biodegradable composite plastic composition according to the present invention can increase the emissivity and enhance the insulation function, and can replace the conventional metal components. The heat sink 13 made of this composition can be manufactured by freely deforming the design and has an advantage that the surface area can be increased.

 In addition, environmentally friendly polylactic acid (PLA) suppresses the generation of CO2 and can be decomposed spontaneously, so that it is harmless to the human body and nature and can be used as a substitute for conventional plastic materials.

The biodegradable composite plastic composition used in the heat sink (! 3) of the LED lamp according to the present invention not only improves the mass productivity even in a small volume, has a high thermo-electric discharge characteristic, It is possible to reduce the production cost.

The above-described embodiments are illustrative of the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims (7)

In an LED lamp,
A PCB substrate on which a plurality of LEDs are mounted;
A heat sink for emitting heat generated from the plurality of LEDs to the outside;
A base for receiving power from the outside and transmitting the power to the PCB substrate;
A diffuser cover formed at a front side of the PCB board to which the LEDs are attached and diffusing light emitted from the LEDs;
/ RTI >
The heat sink
(A) 65 to 80% by weight of a biodegradable polymer obtained by melt-blending polylactic acid (PLA) and polybutylene succinate (PBS);
(B) 10 to 20% by weight of oil consisting of one or more kinds of oils selected from the group consisting of soybean oil, corn oil, castor oil, palm oil, coconut oil, sunflower oil and palm oil, and 80 to 90 weight% of biotite 5% to 20% by weight of a PLA crystallization nucleating agent constituted by a blend of%
(C) 5-10 wt% of PCM capsules (Phase Change Material Microcapsul) powder; And
(D) 5 to 20% by weight of a carbon nanotube (CNT) nanocomposite;
And an LED lamp. The method according to claim 1,
Further comprising a conductor disposed between the heat sink and the PCB substrate to which the plurality of LEDs are attached in order to dissipate heat generated from the plurality of LEDs. 3. The method of claim 2,
The heat sink is elongated and has a hollow center,
The conductor,
A cylindrical first portion contacting the inner surface of the heat sink;
And a second portion connected to the first portion and disposed in parallel with the PCB substrate. The method of claim 3,
Wherein the conductor comprises aluminum. The LED lamp of claim 1, wherein the biodegradable polymer further comprises polybutylene adipate-co-teraprylate (PBAT). The biodegradable polymer of claim 1, wherein the biodegradable polymer comprises 80 to 90% by weight of polylactic acid (PLA), 5 to 15% by weight of polybutylene succinate (PBS), and polybutylene adipate-co- And 0 to 10 wt%. The LED lamp of claim 1, wherein the PCM capsule powder has an average particle size of 3 to 6 占 퐉.
KR1020150085557A 2015-06-17 2015-06-17 Eco-friendly led lamp with improved efficiency of heat radiation KR101675057B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110375213A (en) * 2019-08-02 2019-10-25 深圳市联域光电有限公司 LED corn lamp
KR102648053B1 (en) * 2023-12-14 2024-03-15 (주)에스티씨네트웍스 Eco-friendly led lamp for recycling

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040058310A (en) * 2001-11-24 2004-07-03 메르크 파텐트 게엠베하 Optimised application of pcms in chillers
KR100756897B1 (en) 2007-01-26 2007-09-07 주식회사 혜성엘앤엠 Led lighting lamp
KR20080015367A (en) * 2006-08-14 2008-02-19 스미토모덴코파인폴리머 가부시키가이샤 Molding material, molded part, and method for manufacturing them
JP2014093427A (en) * 2012-11-05 2014-05-19 Unitika Ltd Heat sink
KR101427127B1 (en) * 2007-09-12 2014-08-07 가오 가부시키가이샤 Process for production of injection-molded article of polylactic acid resin

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040058310A (en) * 2001-11-24 2004-07-03 메르크 파텐트 게엠베하 Optimised application of pcms in chillers
KR20080015367A (en) * 2006-08-14 2008-02-19 스미토모덴코파인폴리머 가부시키가이샤 Molding material, molded part, and method for manufacturing them
KR100756897B1 (en) 2007-01-26 2007-09-07 주식회사 혜성엘앤엠 Led lighting lamp
KR101427127B1 (en) * 2007-09-12 2014-08-07 가오 가부시키가이샤 Process for production of injection-molded article of polylactic acid resin
JP2014093427A (en) * 2012-11-05 2014-05-19 Unitika Ltd Heat sink

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110375213A (en) * 2019-08-02 2019-10-25 深圳市联域光电有限公司 LED corn lamp
KR102648053B1 (en) * 2023-12-14 2024-03-15 (주)에스티씨네트웍스 Eco-friendly led lamp for recycling

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