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

Descripción (resumen): 

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

Tipo publicación: 
Publicado en: 
Thirteenth International Conference on Solid State Lighting San Diego, California, United State. Proc. SPIE 9190, 91900J
Ingeniería óptica
Fecha de Publicacion: 
Agosto 2014
Autores CeDInt: 
Otros Autores: 
Anne Teupner , Krister Bergenek, Ralph Wirth