[1] Fang Zhilie, Liu Muqing. Technology status of light emitting diodes [J]. Laser & Optoelectronics Progress, 2010, 47(6): 062502

[2] Ding Shushu, Yu Guiying, Hao Wenwen. A freefrom surface lens for indoor uniform illumination [J]. Laser & Optoelectronics Progress, 2012, 49(4): 042201

[3] Yan Rui, Xiao Zhisong, Deng Sisheng et al.. Progress and prospect of LED optical design [J]. China Illuminating Engineering Journal, 2011, 20(2): 38～42

[4] Yan Xingtao, Yang Jianfeng, Zhang Guoqi et al.. Freeform LED lens design based on longitude-latitude division and tangent-plane iteration [J]. Laser & Optoelectronics Progress, 2011, 48(2): 022201

[5] Yu Guiying, Jin Ji, Ni Xiaowu et al.. Design for LED uniform illumination reflector based on étendue [J]. Acta Optica Sinica, 2009, 29(8): 2297～2301

[6] Liu Zhengquan, Sun Yaojie, Lin Yandan. Freeform reflector design for rectangular illuminance distribution based on differential geometry [J]. Acta Optica Sinica, 2012, 32(10): 1022006

[7] P. A. Davis. Edge-ray principle of nonimaging optics [J]. J. Opt. Soc. Am. A, 1994, 11(4): 1256～1259

[8] H. Ries, A. Rabl. Edge-ray principle of nonimaging optics [J]. J. Opt. Soc. Am. A, 1994, 11(10): 2627～2632

[9] H. Ries, W. Winston. Tailored edge-ray reflectors for illumination [J]. J. Opt. Soc. Am. A, 1994, 11(4): 1260～1264

[10] Yang Yi, Qian Keyuan, Luo Yi. A novel LED uniform illuminance system based on nonimaging optics [J]. Optical Technique, 2007, 33(1): 110～115

[11] Hai Yang, Yang Daoguo, Hou Fengze. Secondary optical simulation of LED based on goniophotometer experiment [J]. Laser & Optoelectronics Progress, 2012, 49(3): 032302