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24 September 2011Effects of pitch and shape for diffraction grating in LED fog lamp
The characteristics of light-emitting diodes (LEDs) that make them energy-efficient and long-lasting light source for
general illumination have attracted a great attention from the lighting industry and commercial market. As everyone
know LEDs have the advantages of environmental protection, long lifetime, fast response time (μs), low voltage and
good mechanical properties. Their high luminance and the wide region of the dominant wavelengths within the entire
visible spectrum mean that people have high anticipations for the applications of LEDs. The output lighting from
reflector in the traditional fog lamp was required to fit the standard of the ECE R19 F3 regulation. Therefore, this study
investigated the effects of pitch and angle for a diffraction grating in LED fog lamp. The light pattern of fog lamp must
be satisfied ECE regulations, so a design of diffraction grating to shift down the lighting was required. There are three
LEDs (Cree XLamp XPE LEDs) as the light source in the fog lamp for the illumination efficiency. Then, an optimal
simulation of diffraction grating was done for the pitch and angle of the diffraction grating at the test distance of 25
meters. The best pitch and angle was 2mm and 60 degree for the grating shape of wedge type.
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Hsi-Chao Chen, Jun-Yu Lin, Jih-Huah Wu, Shih-Hsin Ma, Chi-Hao Yang, "Effects of pitch and shape for diffraction grating in LED fog lamp," Proc. SPIE 8123, Eleventh International Conference on Solid State Lighting, 81231J (24 September 2011); https://doi.org/10.1117/12.893402