Title :
Secondary light distribution design for LED street light
Author :
Yang, Kai ; Song, Jidong ; Chen, Yuqing ; Lin, Bin
Author_Institution :
Coll. of Opt. & Electron. Technol., China JiLiang Univ., Hangzhou, China
Abstract :
The secondary optics design is a critical issue for the light distribution and output efficiency of the LED street light. Traditional light distribution methods are simple but difficult to get high energy efficiency and illumination uniformity together. In this paper, the adoption of the unsymmetrical freeform surface lens can obtain a rectangular light distribution pattern just cover the road with little waste of light. In this paper, an unsymmetrical freeform optic lens is designed which is combining with theory of non-imaging optics and freeform surface. The result shows that light energy efficiency and illumination uniformity under the freeform surface lens can reach 81% and 77% respectively.
Keywords :
lenses; light emitting diodes; street lighting; LED street light; energy efficiency; light emitting diode; nonimaging optics theory; rectangular light distribution pattern; secondary light distribution design; secondary optics design; uniformity illumination; unsymmetrical freeform surface lens design; Algorithm design and analysis; Lenses; Light emitting diodes; LED street light; energy efficiency; freeform surface; illumination uniformity;
Conference_Titel :
Electronics and Optoelectronics (ICEOE), 2011 International Conference on
Conference_Location :
Dalian
Print_ISBN :
978-1-61284-275-2
DOI :
10.1109/ICEOE.2011.6013261
