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

Anne Teupner; Krister Bergenek; Ralph Wirth; Juan C. Miñano; Pablo Benítez

doi:10.1117/12.2060849

25 September 2014 Optimization of optical systems for LED spot lights concerning the color uniformity

Anne Teupner, Krister Bergenek, Ralph Wirth, Juan C. Miñano, Pablo Benítez

Proceedings Volume 9190, Thirteenth International Conference on Solid State Lighting; 91900J (2014) https://doi.org/10.1117/12.2060849
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

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 U_sl 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.

Citation Download Citation

Anne Teupner, Krister Bergenek, Ralph Wirth, Juan C. Miñano, and Pablo Benítez "Optimization of optical systems for LED spot lights concerning the color uniformity", Proc. SPIE 9190, Thirteenth International Conference on Solid State Lighting, 91900J (25 September 2014); https://doi.org/10.1117/12.2060849

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