Enclosure for lighting fixtures coated with high-brightness reflective paint composition

Abstract

The present invention relates to a lighting fixture coated with a high-brightness reflective paint composition, wherein the inner surface of the outer casing or cover of the lighting fixture is coated with the high-brightness reflective paint composition to achieve an upward reflectance compared to existing ones, thereby increasing luminous efficiency and preventing degradation of characteristics caused by heat generation reactions of LEDs or SMPS (Switching Mode Power Supply) constituting the lighting fixture, so as to achieve a long lifespan. The present invention, for achieving the above objective, comprises a ceiling-direct light or LED light source including an enclosure, an LED substrate mounted on the inner ceiling surface of the enclosure with a plurality of LEDs mounted thereon, and a diffuser plate assembled at the bottom of the enclosure; a light guide plate serving to uniformly transmit and evenly emit light emitted from the LED light source over the entire surface; a reflector plate for preventing light incident through the light guide plate from leaking upward toward the light guide plate; a diffuser plate disposed below the light guide plate; an edge frame; and a cover body for forming the outer shape of the ceiling edge light, wherein the inner surfaces of the enclosure and the cover body are electrostatically powder coated with powder paint, wherein the powder paint comprises, based on 100 parts by weight of polyester paint powder, 10 parts by weight of dodecyldimethylbenzylammonium chloride, 6.5 parts by weight of caster oil, 4.5 parts by weight of DOA, 4.5 parts by weight of lithium chloride (LiCl), and ammonium lauryl sulfate It is characterized by being composed by mixing 5 parts by weight and 8.5 parts by weight of isophorone diamine.

Description

Technology Field

[0001] The present invention relates to a lighting fixture coated with a high-brightness reflective paint composition, and more specifically, to a lighting fixture coated with an improved high-brightness reflective paint composition that not only achieves a long lifespan by preventing the degradation of characteristics caused by the heat reaction of an LED or SMPS (Switching Mode Power Supply) constituting the lighting fixture, but also reduces light loss by increasing light efficiency through increased reflectivity. Background Technology

[0002] Generally, lighting fixtures are essential for ensuring excellent indoor illumination not only in homes such as detached houses or apartment buildings, but also in buildings such as offices, officetels, schools, and government offices.

[0003] Most of these lighting fixtures are installed either fixedly or recessed into the lower part of the indoor ceiling. Depending on the installation method, they are classified into ceiling-mounted lights and ceiling-suspended lights, and depending on the installation form, they are classified as ceiling lights or ceiling recessed lights.

[0004] In addition, lighting fixtures are classified into fluorescent, incandescent, and LED lights depending on the type of lamp embedded within them, and are distinguished as direct ceiling lights or edge ceiling lights depending on the type and shape of the embedded LEDs.

[0005] Here, in the case of direct ceiling lights, the most common form is to install a lamp, socket, and ballast inside an enclosure formed by bending a metal plate into a circular or square shape, and to combine a light diffuser plate on the bottom surface of the enclosure. Recently, however, high-brightness and long-life LEDs are mainly being adopted instead of lamps as light sources.

[0006] In addition, ceiling edge lights refer to flat-panel lighting fixtures characterized by their particularly thin thickness and neat, slim design among LED lights. They operate by having an LED light source positioned on the side to emit light, and the light emitted from this LED light source spreads evenly throughout the entire light fixture through a light guide plate made of transparent acrylic resin (PMMA). Additionally, a reflector in the form of a polyester film or a metal-coated film is positioned above the light guide plate to reflect the emitted light in the direction of the light source (direction of the diffuser plate) to ensure a uniform brightness distribution. Furthermore, a diffuser plate is arranged below the light guide plate to diffuse and scatter the light incident through the light guide plate, thereby increasing the brightness in the direction of the light source. This structure makes the product suitable for providing a comfortable lighting environment by reducing glare and shadowing.

[0007] Such LED lighting fixtures have the advantages of a long lifespan, the ability to be miniaturized and lightweight, strong light directionality enabling low-voltage operation, resistance to shock and vibration, the elimination of warm-up time and complex operation, and the ability to be packaged in various forms, allowing for application in a wide range of uses.

[0008] Meanwhile, lighting fixtures are equipped with an SMPS (Switching Mode Power Supply) including LEDs. At this time, the SMPS is a power supply device that efficiently converts power using switching operation, and as it emits a large amount of operating heat along with the LEDs, there is a problem in that the degradation of these components (LEDs, SMPS) proceeds rapidly, resulting in reduced performance and shortened lifespan.

[0009] In addition, a coating layer is formed on the inner surface of the enclosure and cover body to form the shape of the ceiling-mounted light and ceiling-edge light, so as to increase the reflection efficiency of light emitted from the LED (or light guide plate). However, the conventional coating layer is merely a form that increases glossiness with a simple milky white light, so the reflectivity is only about 70-80%, resulting in a light loss of 20-30% and thus having a limitation in that the light efficiency is reduced accordingly. Prior art literature

[0010] Republic of Korea Published Patent No. 10-2024-0078736 (June 4, 2024) Paint composition for coating lighting enclosures The problem to be solved

[0011] The present invention was developed to improve upon the aforementioned conventional problems, and its main purpose is to provide a lighting fixture coated with an improved high-brightness reflective paint composition that not only achieves a long lifespan by preventing performance degradation caused by heat generation of LEDs or SMPS (Switching Mode Power Supply) constituting the lighting fixture, but also reduces light loss by increasing light efficiency through increased reflectivity. means of solving the problem

[0012] The present invention, developed to solve the problems of the prior art, comprises a ceiling-direct light or LED light source including an enclosure, an LED substrate mounted on the inner ceiling surface of the enclosure with a plurality of LEDs mounted thereon, and a diffuser plate assembled at the bottom of the enclosure; a light guide plate serving to uniformly transmit and evenly emit light emitted from the LED light source over the entire surface; a reflector plate for preventing light incident through the light guide plate from leaking upward toward the light guide plate; a diffuser plate disposed below the light guide plate; an edge frame; and a cover body for forming the external shape of the ceiling edge light. In this ceiling edge light, the inner surfaces of the enclosure and the cover body are electrostatically powder coated with powder paint, wherein the powder paint comprises, based on 100 parts by weight of polyester paint powder, 10 parts by weight of dodecyldimethylbenzylammonium chloride, 6.5 parts by weight of caster oil, and DOA (Dioctyl The technical composition is characterized by being composed of a mixture of 4.5 parts by weight of Adipate, 4.5 parts by weight of lithium chloride (LiCl), 5 parts by weight of ammonium lauryl sulfate, and 8.5 parts by weight of isophorone diamine.

[0013] The electrostatic powder coating of the present invention is also characterized by being carried out by including a cleaning process for cleaning the inner surface of an outer casing, a drying process for removing residual moisture and blisters after cleaning, a powder coating process for attaching powder paint to the inner surface of an outer casing by electrostatic force after drying, a baking process for curing the coating film in a baking furnace heated to 180-200°C, and a cooling process for cooling the baked outer casing to fix the coating film.

[0014] In addition, the present invention is characterized in that a heat dissipation enhancer is applied to the outer surface of the enclosure, wherein the heat dissipation enhancer is composed of a mixture of 10 parts by weight of graphite powder having a particle size of 10-20 μm, 8.5 parts by weight of lanthanum hexaboride, and 4.5 parts by weight of benzoguanamine, with respect to 100 parts by weight of polypropylene resin.

[0015] The heat dissipation enhancer according to the present invention is also characterized by being composed by further adding and mixing 6.5 parts by weight of IPDI (Isophorone Diisocyanate) and 4.5 parts by weight of TCPP (Tris 2-chloropropyl phosphate) to 100 parts by weight of polypropylene resin.

[0016] In addition, the heat dissipation enhancer is also characterized by being composed of 5.5 parts by weight of Molypermalloy powder and 8 parts by weight of polyacrylate added and mixed with 100 parts by weight of polypropylene resin. Effects of the invention

[0017] According to the present invention, not only is a long lifespan achieved by preventing the degradation of characteristics caused by the heat generation reaction of LEDs or SMPS (Switching Mode Power Supply) constituting a lighting fixture, but an improved effect is also obtained by reducing light loss by increasing reflectivity and increasing luminous efficiency. Furthermore, by increasing luminous efficiency upward compared to existing lighting fixtures at the same wattage, the invention provides the advantage of lowering power consumption. Brief explanation of the drawing

[0018] FIGS. 1 and 2 are exemplary conceptual diagrams of a ceiling-mounted light and a ceiling-edge light coated with a high-brightness reflective paint composition, and FIG. 3 is an exemplary flowchart showing a powder coating (high-brightness reflective paint composition coating) process for the inner surface of the housing or cover of a lighting fixture according to the present invention. Specific details for implementing the invention

[0019] Prior to the specific description of the present invention, the following specific structural or functional descriptions are provided merely for the purpose of explaining embodiments according to the concept of the present invention. Embodiments according to the concept of the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described herein.

[0020] In addition, since embodiments according to the concept of the present invention may be subject to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention.

[0021] The technology of the present invention is applicable to lighting fixtures equipped with an enclosure or a cover (ceiling-mounted lights, ceiling-edge lights, ceiling-recessed lights, raceway-type parking lot lights, landscape lights, security lights, streetlights, dining table lights, wall lights, parking lot lights, downlights, etc.) and is not limited to any specific type or form.

[0022] Hereinafter, ceiling direct-down lights and ceiling edge lights will be described in detail by exemplifying them according to preferred embodiments.

[0023] As illustrated in FIG. 1, the LED ceiling light according to the present invention comprises an outer housing (100) in the form of a housing, an LED substrate (110) mounted on the upper inner side of the outer housing (100) with a plurality of LEDs (120) mounted thereon, and a diffuser plate (130) assembled at the bottom of the outer housing (100). The outer housing (100) of the above example is formed by bending a metal plate and can be firmly fixed to the lower surface of the indoor ceiling to be installed through a separate mounting bracket.

[0024] In addition, a Switching Mode Power Supply (SMPS) is installed on the upper surface of the above-mentioned enclosure (100) to efficiently convert power using a switching operation, and a high-brightness reflective paint coating layer (hereinafter referred to as a 'powder coating layer') is formed on the inner and outer surfaces of the enclosure for the purpose of preventing corrosion and efficiently reflecting LED radiation light.

[0025] The above powder coating layer is formed by electrostatic powder coating using a paint in powder form. Electrostatic powder coating is a coating method that utilizes electricity, in which a negatively charged coating powder, i.e., powder paint, is sprayed using a spray gun onto a workpiece that has been charged with a positive electrode by connecting it to ground, thereby attaching the paint to the workpiece via static electricity, followed by baking and cooling to form a coating film.

[0026] This electrostatic powder coating has the advantage of obtaining a very beautiful and uniform film thickness and surface. However, it can only be applied to electrically conductive materials. In the present invention, an outer casing (100), which is an electrically conductive metal plate, is used as the workpiece. First, as shown in FIG. 3, a cleaning process is performed to clean the inner surface of the outer casing (100). Then, a drying process is performed to remove residual moisture and blisters. Afterward, a powder coating process is performed to attach powder paint to the inner surface of the outer casing (100) by electrostatic force. Then, a baking process is performed to cure the attached paint film in a baking furnace heated to 180-200°C. Finally, a cooling process is performed to cool the outer casing (100) and firmly fix the film.

[0027] At this time, the washing solution used in the washing process is composed by adding and mixing 10 parts by weight of isopropyl alcohol (IPA), 8.5 parts by weight of dichan, 4.5 parts by weight of sodium nitrite, 6.5 parts by weight of 1,3-bis(aminomethyl)cyclohexane, 7 parts by weight of sodium perborate, and 5 parts by weight of sodium gluconate to 100 parts by weight of water.

[0028] Here, isopropyl alcohol (IPA) exhibits effective properties for removing organic pollutants such as oil, dust, and flux residues.

[0029] In addition, Dichan is (C6H 10 )2ㆍNH3HNO2 is Dicyclo Hexyl Ammonium Nitrite, and it vaporizes from the surface to remove surface impurities and separates and floats them to activate the surface.

[0030] In addition, sodium nitrite contributes to preventing corrosion of metal surfaces and helps maintain a homogeneous surface.

[0031] In addition, 1,3-diaminomethylcyclohexane decomposes and removes organic matter from the surface and contributes to increasing the drying speed inside microcracks.

[0032] In addition, sodium perborate contributes to rapidly floating and separating foreign substances remaining on the cleaning surface.

[0033] In addition, sodium gluconate contributes to separating and removing various organic substances present on the surface of the cleaning agent and ensuring water resistance.

[0034] In particular, it is desirable to ensure surface uniformity after powder coating by thoroughly performing the cleaning process in this way, thereby significantly increasing the light reflectance by more than 10% compared to the existing rate and contributing to the improvement of light efficiency.

[0035] In addition, the powder coating used in the above powder coating process is composed by mixing 10 parts by weight of dodecyldimethylbenzylammonium chloride, 6.5 parts by weight of caster oil, 4.5 parts by weight of DOA (Dioctyl Adipate), 4.5 parts by weight of lithium chloride (LiCl), 5 parts by weight of ammonium lauryl sulfate, and 8.5 parts by weight of isophorone diamine, based on 100 parts by weight of polyester paint powder.

[0036] In this case, polyester powder is widely used as a powder coating because it has excellent discoloration resistance, maintains gloss, and has superior weather resistance.

[0037] In addition, dodecyldimethylbenzylammonium chloride induces surface homogenization and contributes to increasing heat resistance and light reflection efficiency.

[0038] In addition, caster oil is a type of triglyceride composed of fatty acids, 90% of which is linolenic acid, and contributes to increasing film stability, improving adhesion and surface uniformity to ensure glossiness, as well as improving light reflection efficiency.

[0039] In addition, DOA (Dioctyl Adipate) exhibits excellent discoloration resistance that inhibits deformation and discoloration caused by heat, and contributes to increasing the fixation stability of the coating film by enhancing impact resistance, durability, and heat resistance.

[0040] In addition, lithium chloride (LiCl) is a material corresponding to CAS No. 7447-41-8, which significantly increases the uniformity and gloss of metal surfaces and contributes to rapidly improving light reflection efficiency.

[0041] In addition, Ammonium Lauryl Sulfate is a substance corresponding to CAS No. 2235-54-3 that improves the uniform dispersion between components and contributes to increasing the surface uniformity of the coating film.

[0042] Furthermore, isophorone diamine prevents separation between materials and improves bonding and curing strength, contributing to enhanced reflective properties through film stability, gloss, and the formation of a mirror surface.

[0043] In this way, the light reflectance of the inner surface of the electrostatically powder-coated outer casing (100) was tested.

[0044] The light reflectance test was performed by placing the electrostatic powder-coated enclosure (100) according to the present invention over a lighting fixture as before, emitting a light source, and then measuring the light reflectance in % units using a reflectance meter based on the SCE (Specular Component Excluded) method.

[0045] At this time, the measurement locations were measured 5 times each at a location 80 cm directly below the center of the outer casing (100), a location 85 cm to the side at an angle of 10-15° from the center, and a location 90 cm to the side at an angle of 30-45° from the center, and the average of these measurements was calculated. The average value of the measurements was 93.4%, and it was confirmed that a significantly improved light reflectance compared to the existing light reflectance (70-80%) could be secured.

[0046] The ceiling edge light of the illustrated embodiment is composed of a light panel (200) that induces the path, scattering, and diffusion of light and performs the function and role of converting a point light source into a surface light source, an LED light source (LED module) (210) that emits light when power is supplied and irradiates light toward the side of the light panel, an edge frame (220) that supports the four side edges of the light panel, and a cover body (230a) (230b) for forming the shape of the ceiling edge light.

[0047] The light panel (200) of the above example includes a light guide plate (201) that uniformly transmits and evenly emits light emitted from an LED light source (210) across the entire surface, a reflector plate (202) that is laminated or attached to the upper surface of the light guide plate to prevent light incident through the light guide plate from leaking upwards, and a diffuser plate (203) that diffuses and scatters incident light while positioned below the light guide plate to convert a point light source into a surface light source and to produce uniform brightness in the direction of light emission.

[0048] Here, since a powder coating layer is formed identically on the inner and outer surfaces of the ceiling edge light cover body (230a), and the corresponding powder coating layer has the same compositional ratio and physical and chemical properties as the powder coating layer of the ceiling light directly below the example above, a redundant explanation will be omitted.

[0049] According to another embodiment of the present invention, a heat dissipation enhancer is applied to the outer surface of the housing (100) of the ceiling light and the ceiling edge light cover (230a) to improve heat dissipation, thereby preventing the deterioration of the LED and SMPS and thereby providing various embodiments that can extend the service life of the lighting fixture.

[0050] The heat dissipation enhancer of the illustrated embodiment may be composed by mixing 10 parts by weight of graphite powder having a particle size of 10-20 μm, 8.5 parts by weight of lanthanum hexaboride, and 4.5 parts by weight of benzoguanamine with respect to 100 parts by weight of polypropylene resin.

[0051] In this case, graphite powder is a mineral belonging to the hexagonal crystal system that has a honeycomb-shaped plate structure and possesses higher thermal conductivity than metal, thus contributing to the effective dissipation of heat generated by the LED.

[0052] In addition, lanthanum hexaboride is a boride of lanthanum that has a low work function and a high electron emission, providing very stable heat dissipation characteristics and also providing heat resistance characteristics.

[0053] In addition, benzoguanamine is a substance corresponding to CAS number 91-76-9 that suppresses shrinkage deformation during molding and enhances binding properties while maintaining electrostatic properties.

[0054] Meanwhile, in the present invention, when composing the heat dissipation enhancer, 6.5 parts by weight of IPDI (Isophorone Diisocyanate) and 4.5 parts by weight of TCPP (Tris 2-chloropropyl phosphate) may be further added and mixed with 100 parts by weight of polypropylene resin.

[0055] Here, IPDI (Isophorone Diisocyanate) promotes the curing speed while suppressing discoloration of the resin, thereby inducing the maintenance of a strong bond.

[0056] Furthermore, TCPP (Tris 2-chloropropyl phosphate) has the characteristic of significantly improving heat resistance and insulation properties, thereby reducing fatigue, suppressing cracks and fractures in the coating layer, and preventing safety accidents.

[0057] Additionally, in the present invention, when composing the heat dissipation enhancer, 5.5 parts by weight of Molypermalloy powder and 8 parts by weight of polyacrylate may be further added and mixed with 100 parts by weight of polypropylene resin.

[0058] In this case, Molypermalloy powder, as a metal powder, efficiently fills the voids that may occur when only a single-shape inorganic filler is applied, thereby improving packing density and maintaining continuous heat dissipation characteristics, which contributes to improving heat dissipation efficiency.

[0059] In addition, polyacrylic acid enhances the dispersion stability of the composition, thereby preventing a deterioration in heat dissipation characteristics.

[0060] The diffuser plate (130)(203) of the illustrated embodiment is made by extrusion or injection molding of a synthetic resin and must possess light transmittance and diffusion properties as well as heat dissipation, heat resistance, stain resistance, water resistance, and erosion resistance, so it is preferable to mold it after being composed of the following molding composition.

[0061] The above molding composition comprises 8 parts by weight of cyclopentylmethyl ether (CPME) and Na2B4O per 100 parts by weight of polycarbonate. 71 It is composed of mixing 15 parts by weight of sodium tetraborate decahydrate (OH2O), 4.5 parts by weight of graphite powder having a particle size of 20 μm, 7.5 parts by weight of 2,4-dihydroxy-butanoic acid, 10 parts by weight of liquid crystal resin (LCP), 5.5 parts by weight of dibutyl adipate, and 4.5 parts by weight of wollastonite powder having a particle size of 20 μm.

[0062] In this case, PC (polycarbonate) is a transparent thermoplastic resin that is easy to achieve the desired color intensity and has excellent moldability. In particular, it possesses superior heat resistance and weather resistance, which are advantageous for extending its lifespan.

[0063] In addition, cyclopentylmethyl ether (CPME) increases the interlocking and bonding between inorganic materials and resins, and contributes to enhancing fire resistance, water resistance, corrosion resistance, and heat resistance.

[0064] And, Na2B4O 71Sodium tetraborate decahydrate (0H2O), also known as borax, is a sodium borate hydrate that lowers resistance to immature curing during curing, thereby increasing the degree of freedom of molding, suppressing compressive deformation after molding, and increasing curing strength, contributing to the enhancement of corrosion resistance, durability, antifouling, water resistance, and heat resistance.

[0065] In addition, graphite powder with a particle size of 20㎛ improves heat dissipation characteristics, prevents deterioration, and contributes to improving durability.

[0066] In addition, 2,4-dihydroxy-butanoic acid is a substance corresponding to CAS number 1518-62-3, which prevents the reduction of voids due to inter-particle adsorption when mixed, thereby strengthening anchoring properties and significantly increasing heat resistance, as well as contributing to increased water resistance, corrosion resistance, and durability.

[0067] In addition, Liquid Crystal Resin (LCP) improves the dispersibility of graphite powder and increases thermal conductivity, and contributes to enhancing the elasticity, high heat resistance, high chemical resistance, and heat dissipation of molded products.

[0068] Furthermore, dibutyl adipate contributes to achieving a long lifespan by maintaining flexibility through enhanced heat resistance properties, achieved by forming a surface film that blocks UV rays and prevents oxidation.

[0069] In addition, wollastonite powder with a particle size of 20㎛ is a material corresponding to CAS No. 13983-17-0, which increases heat dissipation by increasing thermal conductivity and contributes to strengthening corrosion resistance and heat resistance.

[0070] The present invention, as described in the above embodiment, provides a novel and useful effect of improving luminous efficiency by increasing the reflectance of LED emitted light and lowering power consumption by increasing luminous efficiency at the same wattage level, and also prevents the degradation of characteristics caused by heat generation of LEDs or SMPS used to construct lighting fixtures, thereby allowing for quality stability and extended lifespan. Explanation of the symbols

[0071] 100 : Enclosure, 110 : LED board, 120 : LED, 130 : Diffuser, 200 : Light panel, 201 : Light guide plate, 202: Reflector, 203: Diffuser, 210 : LED light source, 220 : Edge frame, 230a : Cover body

Claims

Claim 1 A lighting fixture comprising an outer housing (100), an LED substrate (110) mounted on the inner ceiling surface of the outer housing (100) with a plurality of LEDs (120) mounted thereon, and a diffuser plate (130) assembled at the bottom of the outer housing (100); wherein the inner surface of the outer housing (100) is electrostatically powder coated with powder paint, wherein the powder paint comprises, based on 100 parts by weight of polyester paint powder, 10 parts by weight of dodecyldimethylbenzylammonium chloride, 6.5 parts by weight of caster oil, 4.5 parts by weight of DOA (Dioctyl Adipate), 4.5 parts by weight of lithium chloride (LiCl), 5 parts by weight of ammonium lauryl sulfate, and isophorone diamine The above electrostatic powder coating is composed by mixing 8.5 parts by weight; the above electrostatic powder coating is carried out by including a washing process for washing the inner surface of the outer casing (100), a drying process for removing residual moisture and blisters after washing, a powder coating process for attaching the powder paint to the inner surface of the outer casing (100) by electrostatic force after drying, a baking process for curing the coating film in a baking furnace heated to 180-200°C, and a cooling process for cooling the baked outer casing (100) to fix the coating film; the washing liquid used in the above washing process comprises, for every 100 parts by weight of water, 10 parts by weight of isopropyl alcohol (IPA), 8.5 parts by weight of Dichan, 4.5 parts by weight of sodium nitrite, and 6 parts by weight of 1,3-bis(aminomethyl)cyclohexane.A lighting fixture coated with a high-brightness reflective paint composition, characterized in that the composition is formed by adding and mixing 5 parts by weight of sodium perborate, 7 parts by weight of sodium perborate, and 5 parts by weight of sodium gluconate; and a heat dissipation enhancer is applied to the outer surface of the enclosure (100), wherein the heat dissipation enhancer is composed of, based on 100 parts by weight of polypropylene resin, 10 parts by weight of graphite powder having a particle size of 10-20 μm, 8.5 parts by weight of lanthanum hexaboride, 4.5 parts by weight of benzoguanamine, 6.5 parts by weight of IPDI (Isophorone Diisocyanate), 4.5 parts by weight of TCPP (Tris 2-chloropropyl phosphate), 5.5 parts by weight of molypermalloy powder, and 8 parts by weight of polyacrylate. Claim 2 A lighting fixture comprising an LED light source (210), a light guide plate (201) serving to uniformly transmit and evenly emit light emitted from the LED light source over an entire surface, a reflector (202) for preventing light incident through the light guide plate from leaking to the upper side of the light guide plate, a diffuser plate (203) disposed on the lower side of the light guide plate, an edge frame (220), and a cover body (230a) forming an outer shape; wherein the inner surface of the cover body (230a) is electrostatically powder coated with powder paint, the powder paint comprises, based on 100 parts by weight of polyester paint powder, 10 parts by weight of dodecyldimethylbenzylammonium chloride, 6.5 parts by weight of caster oil, 4.5 parts by weight of DOA (Dioctyl Adipate), and 4.5 parts by weight of lithium chloride (LiCl). The composition is formed by mixing 5 parts by weight of ammonium lauryl sulfate and 8.5 parts by weight of isophorone diamine; the diffusion plate (203) is molded from a synthetic resin molding composition, wherein the molding composition comprises 8 parts by weight of cyclopentylmethyl ether (CPME) and Na2B4O per 100 parts by weight of polycarbonate. 71The composition comprises mixing 15 parts by weight of sodium tetraborate decahydrate (OH₂O), 4.5 parts by weight of graphite powder having a particle size of 20 μm, 7.5 parts by weight of 2,4-dihydroxy-butanoic acid, 10 parts by weight of liquid crystal resin (LCP), 5.5 parts by weight of dibutyl adipate, and 4.5 parts by weight of wollastonite powder having a particle size of 20 μm; wherein a heat dissipation enhancer is applied to the outer surface of the cover body (230a), and the heat dissipation enhancer comprises, for every 100 parts by weight of polypropylene resin, 10 parts by weight of graphite powder having a particle size of 10-20 μm and 8.5 parts by weight of lanthanum hexaboride. A lighting fixture coated with a high-brightness reflective paint composition characterized by being composed of a mixture of 4.5 parts by weight of benzoguanamine, 6.5 parts by weight of IPDI (Isophorone Diisocyanate), 4.5 parts by weight of TCPP (Tris 2-chloropropyl phosphate), 5.5 parts by weight of molypermalloy powder, and 8 parts by weight of polyacrylate. Claim 3 delete Claim 4 delete Claim 5 delete

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