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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 3 — Feb. 11, 2013
  • pp: 3201–3212

Rectangular illumination using a secondary optics with cylindrical lens for LED street light

Hsi-Chao Chen, Jun-Yu Lin, and Hsuan-Yi Chiu  »View Author Affiliations

Optics Express, Vol. 21, Issue 3, pp. 3201-3212 (2013)

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The illumination pattern of an LED street light is required to have a rectangular distribution at a divergence-angle ratio of 7:3 for economical illumination. Hence, research supplying a secondary optics with two cylindrical lenses was different from free-form curvature for rectangular illumination. The analytical solution for curvatures with different ratio rectangles solved this detail by light tracing and boundary conditions. Similarities between the experiments and the simulation for a single LED and a 9-LED module were analyzed by Normalized Cross Correlation (NCC), and the error rate was studied by the Root Mean Square (RMS). The tolerance of position must be kept under ± 0.2 mm in the x, y and z directions to ensure that the relative illumination is over 99%.

© 2013 OSA

OCIS Codes
(080.2740) Geometric optics : Geometric optical design
(230.3670) Optical devices : Light-emitting diodes
(220.2945) Optical design and fabrication : Illumination design

ToC Category:
Optical Design and Fabrication

Original Manuscript: December 5, 2012
Revised Manuscript: January 18, 2013
Manuscript Accepted: January 21, 2013
Published: February 1, 2013

Hsi-Chao Chen, Jun-Yu Lin, and Hsuan-Yi Chiu, "Rectangular illumination using a secondary optics with cylindrical lens for LED street light," Opt. Express 21, 3201-3212 (2013)

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