[1] Jin Peng, Yu Chunyu, Zhou Qifeng, et al.. Superior application of LED to street lighting[J]. Optics and Precision Engineering, 2011, 19(1): 51-55.

[2] Wang Hong, Zhang Xiaofan, Wang Haihong, et al.. Design for optical freeform reflector of LED[J]. Infrared and Laser Engineering, 2010, 39(4): 727-731.

[3] Wang K, Chen F, Liu Z Y, et al.. Design of compact freeform lens for application specific light-emitting diode packaging[J]. Opt Express, 2010, 18(2): 413-425.

[4] He Zhihua, Dong Qianmin, Wang Shaolei, et al.. LED freeform lens design for street uniform illumination[J]. China Illuminating Engineering Journal, 2014, 25(4): 85-89.

[5] Fournier F R, Cassarly W J, Rolland J P. Fast freeform reflector generation using source-target maps[J]. Opt Express, 2010, 18(5): 5295-5304.

[6] Li Lin, Wang Guangzhen, Wang Lili, et al.. Lens design for uniform illumination with LED[J]. Acta Optica Sinica, 2012, 32(2): 0222002.

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

[8] Wang K, Liu S, Chen F, et al.. Freeform LED lens for rectangularly prescribed illumination[J]. Journal of Optics A: Pure and Applied Optics, 2009, 11(10): 105501.

[9] Zhang Kang, Su Chengyue, Wang Weijiang. LED freeform surface lens design for uniform illumination with square spot[J]. China Illuminating Engineering Journal, 2014, 25(1): 82-88.

[10] Shan Qiusha, Zhang Guoyu, Lu Shi, et al.. Lagrange invariant energy transfer of solar simulator[J]. Chinese Optics, 2012, 5(6): 639-644.

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