[1] [1] Zhou Zhimin, Ji Aihua. Design and Application of High Power LED Illumination Technology [M]. Beijing: Publishing House of Electronics Industry, 2011. 1-10.

[2] [2] Yu Guiying, Jin Ji, Ni Xiaowu, et al.. Design for LED uniform illumination reflector based on etendue [J]. Acta Optica Sinica, 2009, 29(8): 2297-2301.

[3] [3] Ding Yi, Liu Xu, Zheng Zhenrong, et al.. Freeform LED lens for uniform illumination [J]. Optical Society of America, 2007, 16(17): 12958-12966.

[4] [4] Ding Yi, Gu Peifu. Free form reflector for uniform illumination [J]. Acta Optica Sinica, 2007, 27(3): 540-544.

[5] [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] [6] F Fournier, J Rolland. Optimization of freeform light pipes for light- emitting diode projectors [J]. Appl Opt, 2008, 47(6): 86-96.

[7] [7] Zhang Hang, He Yemei, Li Dong, et al.. Design for Fresnel reflector of uniform light LED tubes based on ellipse flowline methods with equipartition and foci map [J]. Acta Photonica Sinica, 2012, 41(4): 421-424.

[8] [8] Julio C. Introduction to Nonimaging Optics [M]. New York: CRC Press, 2008. 55-116, 474-475.

[9] [9] Harald R, Ari R. Edge-ray principle of nonimaging optics [J]. Opt Soc Am A, 1994, 11(10): 2627-2632.

[10] [10] Roland Winston, Juan C.Minano, Pablo Benítez. Nonimaging Optics [M]. London: Elsevier Academic Press, 2005. 99-157.