27 November 2012 Design of freeform LED lens with large light deflection angle for road lighting application
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Abstract
The deflection of light of a single optical surface is limited by the Fresnel reflection loss and it is usually not enough to meet the requirements in large road width, tilt lighting LED lens design. This paper presents a method which greatly increases the light deflection angle of LED lens by combining a tilting aspherical surface with a freeform surface. Using this design method, a road lighting LED lens for length L= 30m, road width W=12m and tilt angle θ = 15 ° is designed and manufactured. The experimental results show that the overall road luminance uniformity is as high as 0.7. This design method greatly expand the light distributing capacity of the free-form surface LED lens, and it can be widely used in the design of LED road lighting lens and other illumination applications where large light deflection angle is needed.
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Shaoyun Yin, Shaoyun Yin, Zhongxun Wang, Zhongxun Wang, Xiuhui Sun, Xiuhui Sun, Liangping Xia, Liangping Xia, Hui Pang, Hui Pang, Qiling Deng, Qiling Deng, Chunlei Du, Chunlei Du, } "Design of freeform LED lens with large light deflection angle for road lighting application", Proc. SPIE 8560, LED and Display Technologies II, 85600E (27 November 2012); doi: 10.1117/12.999767; https://doi.org/10.1117/12.999767
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