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

Teupner, Anne and Bergenek, Krister and Wirth, Ralph and Miñano Dominguez, Juan Carlos and Benitez Gimenez, Pablo (2014). Optimization of optical systems for LED spot lights concerning the color uniformity. In: "13th International Conference on Solid State Lighting", 20/08/2014 - 21/08/2014, San Diego, California, EE.UU. pp. 1-7. https://doi.org/10.1117/12.2060849.

Description

Title: Optimization of optical systems for LED spot lights concerning the color uniformity
Author/s:
  • Teupner, Anne
  • Bergenek, Krister
  • Wirth, Ralph
  • Miñano Dominguez, Juan Carlos
  • Benitez Gimenez, Pablo
Item Type: Presentation at Congress or Conference (Article)
Event Title: 13th International Conference on Solid State Lighting
Event Dates: 20/08/2014 - 21/08/2014
Event Location: San Diego, California, EE.UU
Title of Book: Proceedings of the SPIE
Título de Revista/Publicación: THIRTEENTH INTERNATIONAL CONFERENCE ON SOLID STATE LIGHTING
Date: 2014
ISSN: 0277-786X
Volume: 9190
Subjects:
Freetext Keywords: Spot light, color uniformity, non imaging optics, LED illumination, collimation optics
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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.

More information

Item ID: 36081
DC Identifier: http://oa.upm.es/36081/
OAI Identifier: oai:oa.upm.es:36081
DOI: 10.1117/12.2060849
Deposited by: Memoria Investigacion
Deposited on: 29 Jul 2015 18:07
Last Modified: 29 Jul 2015 18:07
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