Acta Optica Sinica, Volume. 35, Issue 2, 208001(2015)
Study of the Optical Systems with Illuminance and Luminance Uniformity Simultaneously for LED Lighting
For road lighting, the human eyes observe surface luminance rather than the illuminance. An ideal road lighting system should be able to achieve both the uniformity of illumination and luminance. A design method is presented to realize the illumination and luminance uniformity of road surface. According to the Commission Internationale Ed I′eclairage (CIE) standard simplified luminance coefficient table, the luminance coefficient of all road surface points can be obtained. Then these parameters are analyzed by using the least square method, so as to obtain the optimal illumination distribution. According to the minimum energy block iterative methodology, we mesh both the light source and the receiving surface. With the three- dimensional free- form surface design method, the optical lens are obtained which can get the illumination uniformity of 93.47% and the luminance uniformity of 86.94% and 89.26% for a C1 double lane road surface.
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Qian Keyuan, Hu Xiaojia. Study of the Optical Systems with Illuminance and Luminance Uniformity Simultaneously for LED Lighting[J]. Acta Optica Sinica, 2015, 35(2): 208001
Category: Geometric Optics
Received: Jul. 30, 2014
Accepted: --
Published Online: Jan. 9, 2015
The Author Email: Keyuan Qian (qianky@sz.tsinghua.edu.cn)