Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Optimization of optical systems for LED spot lights concerning the color uniformity
Research Areas
  • Engineering
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. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thirteenth International Conference on Solid State Lighting
Start Date
End Date
From page
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Thirteenth International Conference on Solid State Lighting. Proc. SPIE 9190, 91900J
  • Autor: Juan Carlos Miñano Dominguez (UPM)
  • Autor: Pablo Benitez Gimenez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería Óptica
  • Departamento: Electrónica Física
  • Centro o Instituto I+D+i: Centro de Domótica Integral, CEDINT
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Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
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