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Energy Express

Energy Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. S6 — Nov. 7, 2011
  • pp: A1190–A1195

Optics InfoBase > Energy Express > Volume 19 > Issue S6 > Page A1190

Reliability of point source approximations in compact LED lens designs

Thøger Kari, Jesper Gadegaard, Thomas Søndergaard, Thomas Garm Pedersen, and Kjeld Pedersen  »View Author Affiliations


Optics Express, Vol. 19, Issue S6, pp. A1190-A1195 (2011)
http://dx.doi.org/10.1364/OE.19.0A1190


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Abstract

In many applications, compact concentrator lenses are used for collimating light from LEDs into high output beams. When optimizing lens designs, the LED is often approximated as a point source. At small lens-to-LED size ratios this is known to be inaccurate, but the performance compared to optimizations with more realistic models is rarely addressed. This paper examines the reliability of a point source model in compact lens design by comparing with optimisations that use a factory measured LED ray-file. The point source is shown to cause significant, unnecessary efficiency loss even at large lens sizes, while the use of a ray-file allows for a >55% reduction in the footprint area of the lens. The use of point source approximations in compact lens designs is therefore generally discouraged.

© 2011 OSA

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(220.2740) Optical design and fabrication : Geometric optical design
(230.3670) Optical devices : Light-emitting diodes
(220.4298) Optical design and fabrication : Nonimaging optics

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: August 22, 2011
Revised Manuscript: September 14, 2011
Manuscript Accepted: September 14, 2011
Published: September 23, 2011

Citation
Thøger Kari, Jesper Gadegaard, Thomas Søndergaard, Thomas Garm Pedersen, and Kjeld Pedersen, "Reliability of point source approximations in compact LED lens designs," Opt. Express 19, A1190-A1195 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-S6-A1190


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