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18 August 2010 Effects of radiation characteristic and luminous efficiency for LED lampshade with cylindrical lens
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Abstract
Light emitting diode (LED) is an environmental-friendly product and could be a main lighting source in future. The research was to design a suitable LED lampshade for the street lighting. The radiation characteristic was required to be a rectangular distribution at the divergence-angle ratio of 7:3 for the x and y directions. Hence a design of two cylindrical lenses on the lampshade was used for the lighting distribution. Then an optimal simulation of these curvatures was done for the luminous distribution and efficiency. Final we got a rectangular lighting of the divergence-angle ratio of 7:3 and the radiator characteristic of bat-wing. The tolerance analyses of LED source distances were done on the x, y and z directions. The z direction was more sensibility than x and y directions for luminous efficiency and its tolerance must be kept under ±0.5mm for the illumination efficiency to be over 95%. Anyway, the similar extent could reach to 98.46% by Normalized Cross Correlation (NCC) between experimental and simulation and the error extent could reduce to 6.87% by Root Mean Square (RMS) error mode. The total luminance efficiency could reach to 92% without AR coating.
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Hsi-Chao Chen, Jun-Yu Lin, Chi-Hao Yang, and Yi-Xuan Lu "Effects of radiation characteristic and luminous efficiency for LED lampshade with cylindrical lens", Proc. SPIE 7784, Tenth International Conference on Solid State Lighting, 77841A (18 August 2010); https://doi.org/10.1117/12.861351
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