Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33971
Title: Optical design of a freeform TIR lens for LED streetlight
Authors: Jiang, J
To, S 
Lee, WB 
Cheung, B
Keywords: Freeform lens
LED streetlight
Light distribution
Secondary optics
TIR
Issue Date: 2010
Publisher: Urban & Fischer
Source: Optik, 2010, v. 121, no. 19, p. 1761-1765 How to cite?
Journal: Optik 
Abstract: Secondary optics is a critical component determining the output efficiency and light distribution of the LED streetlight. A good roadway illumination requires the LED streetlight have a rectangular light pattern just cover the roadway and without excess spill light creeping into yards and shining into windows of neighbor residents. The adoption of the unsymmetrical freeform optics with different light distributions along X and Y directions is necessary. The whole LED streetlight can be constructed if only mounts these LED modules on the planar PCB plate. The mechanism, thermal management, and the power control electronics of the LED streetlight become very simple. In this paper, an optical design approach of a freeform TIR (total internal reflection) lens for the LED streetlight is investigated. With these freeform lenses, high output efficiency, even light distribution, and batwing far field beam angle distribution can be achieved.
URI: http://hdl.handle.net/10397/33971
ISSN: 0030-4026
EISSN: 1618-1336
DOI: 10.1016/j.ijleo.2009.04.009
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