| Summary: | 碩士 === 龍華科技大學 === 工程技術研究所 === 98 === LED light bulb is the photosource only for the straight line direction of advance. Because the high power crystal grain shines easily gather the heat, LED bulb must be able to scattered effectively. Besides outward appearance good, the cost might also reduce. High power LED light source will generate heat from the die, so it requires an effective cooling. Therefore, adding heat sink in light substrate, using aluminum to make the heat housing, natural convection cooling with a larger curvature area, lamps’ lifetime and function can increase significantly. Use weather resistant plastic material to make shade and thermal resistance casing, and to form injection molding. In addition to the good appearance, the cost can also be cut down.
The experiment used the first version of fin heat sink design which was able to lower the temperature of aluminum-based plate from 67℃ to 62℃. As the result was not as effective as expected, the design had to be changed in order to lower the temperature to below 58℃. By calculating the luminous flux, we know that its highly translucent with the level of translucency at 96%. After analyzing, we obtained the results for the following types of light: white LED with luminous flux of 676.2 Lumen, luminous efficiency of 75 Lumen/Watt; warm LED with luminous flux of 616.4 Lumen, luminous efficiency of 68 Lumen/Watt.
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