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Proceedings Paper

Optimization of optical systems for LED spot lights concerning the color uniformity
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Paper Abstract

Spotlighting is one illumination field where the application of light emitting diodes (LED) creates many advantages. Commonly, the system for spot lights consists of a LED light engine and collimating secondary optics. Through angular or spatial separated emitted light from the source and imaging optical elements, a non uniform far field appears with colored rings, dots or patterns. Many feasible combinations result in very different spatial color distributions. Several combinations of three multi-chip light sources and secondary optical elements like reflectors and TIR lenses with additional facets or scattering elements were analyzed mainly regarding the color uniformity. They are assessed by the merit function Usl which was derived from human factor experiments and describes the color uniformity based on the visual perception of humans. Furthermore, the optical systems are compared concerning efficiency, peak candela and aspect ratio. Both types of optics differ in the relation between the color uniformity level and other properties. A plain reflector with a slightly color mixing light source performs adequate. The results for the TIR lenses indicate that they need additional elements for good color mixing or blended light source. The most convenient system depends on the requirements of the application.

Paper Details

Date Published: 25 September 2014
PDF: 7 pages
Proc. SPIE 9190, Thirteenth International Conference on Solid State Lighting, 91900J (25 September 2014); doi: 10.1117/12.2060849
Show Author Affiliations
Anne Teupner, Univ. Politécnica de Madrid (Spain)
Krister Bergenek, OSRAM Opto Semiconductors GmbH (Germany)
Ralph Wirth, OSRAM Opto Semiconductors GmbH (Germany)
Juan C. Miñano, Univ. Politécnica de Madrid (Spain)
Pablo Benítez, Univ. Politécnica de Madrid (Spain)

Published in SPIE Proceedings Vol. 9190:
Thirteenth International Conference on Solid State Lighting
Matthew H. Kane; Jianzhong Jiao; Nikolaus Dietz; Jian-Jang Huang, Editor(s)

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