Optical design of a Butterfly lens for a street light based on a double-cluster LED |
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| Authors: | Yi-Chien Lo Kuan-Teng Huang Xuan-Hao Lee Ching-Cherng Sun |
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| Affiliation: | 1. Department of Optics and Photonics, National Central University, Chung-Li, Taiwan;2. Institute of Lighting and Display Science, National Central University, Chung-Li, Taiwan;3. Department of Photonics Engineering, Yuan Ze University, Chung-Li, Taiwan |
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| Abstract: | We construct a precise optical model of the cluster LED and propose a design of a peanut form lens to achieve an optical utilization factor of 45% and uniformity of 1/2.7. Then we propose a new design of so-called Butterfly lens with unequal tilt design aimed to serve a double-cluster LED but with a tightened size. The optical utilization factor of the Butterfly lens is about 43.8%, the uniformity is around 1/2.7, and an averaged illuminance of 14 lx, which could meet almost all types requested by IESNA. The design of the Butterfly lens is proven workable for a double-cluster LED. |
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