Optical Design of High-Power White-Light LEDs for Illumination
| Autor: | Jian-li Huang, 黃建歷 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 White light LEDs have more advantages than those of traditional incandescent lamps and the fluorescent lamps; e.g. high stability, long life time and low power consuming etc. Therefore, white light LEDs have been regarded as the most potential light source of solid-state lighting (SSL) in the future. In this thesis, we focus on the white light LED optical design and illumination analyses. For the optical design issue, our purpose is to design a 300-Lux lamp on the work plane which is 2 meter away with LED with 4 square meters in size plane and has uniformity illumination. The luminous intensity distribution curve shape is a batwing distribution and the maximum luminous intensity around 27° which compares with 0° approximately is 0.71. We focus on the design of LED lens using the LightTools software to improve the light distribution of white light LED. After the luminous intensity distribution curve design is completed, the lamp needs nine LEDs to enable the work plane approximately to have 300 Lux. Next, we optimize the lamp to enhance the uniformity illumination on the work plane. The uniformity illumination is promoted to 0.9. For the illumination analysis issue, we use the LED lamp and the fluorescent lamp in the indoor space making the comparison. According to the comparison results, the utilization factor of the LED lamp is 0.682 higher than the utilization factor of the fluorescent lamp is 0.394. The LED lamp produces 100Lux which needs 2.29W is smaller than the fluorescent lamp produces 100Lux which needs 2.56W in the unit area (1m2). It proved that the LED lamp has low consumption when compares to that of the fluorescent lamp. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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