The Secondary Optical Design and Fabrication for the Uniform Illuminating LED Spotlight Using TIR LensYingchao Xu, Guanyu Chen, Yongxiao Chang, Hongyi Lin, Jiamei Zheng and Liangqin GanMATEC Web of Conferences, 61 (2016) 06002DOI: https://doi.org/10.1051/matecconf/20166106002