Design of asymmetric freeform lens for low glared LED street light with total internal reflection

Min-Feng Lai, Yi-Chian Chen, Nguyen Doan Quoc Anh, Tsai-Yu Chen, Hsin-Yi Ma, and Hsiao-Yi Lee


The study is focused on the asymmetric secondary freeform lens (ASFL) design for creating a low glared light-emitting diode (LED) street light. The lens is mounted on a chip on board (COB) LED as the new LED street light module to perform a non-axial symmetric light intensity distribution. The experimental results show that the street light can work without inclining lamps and reach Chinese National Standards (CNS) and Illuminating Engineering Society of North America (IESNA) standards at the same time.

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