Freeform TIR collimators for the removal of angular color variation in white LED spotlights

Corien Prins; Christine Schneider; Wilbert IJzerman; Teus Tukker; Jan ten Thije Boonkkamp

doi:10.1117/12.2023870

18 September 2013 Freeform TIR collimators for the removal of angular color variation in white LED spotlights

Corien Prins, Christine Schneider, Wilbert IJzerman, Teus Tukker, Jan ten Thije Boonkkamp

Proceedings Volume 8834, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration X; 88340J (2013) https://doi.org/10.1117/12.2023870
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Angular color variation in white, phosphor-converted LEDs causes undesirable yellow rings in the beams of spotlights. We developed an inverse method to design TIR collimators that remove the angular color variation for point light sources and significantly reduce color variation for extended light sources, without the need for facets, holographic foils or scattering surfaces. We performed several numerical simulations to evaluate the performance of this point source method for extended light sources.

Citation Download Citation

Corien Prins, Christine Schneider, Wilbert IJzerman, Teus Tukker, and Jan ten Thije Boonkkamp "Freeform TIR collimators for the removal of angular color variation in white LED spotlights", Proc. SPIE 8834, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration X, 88340J (18 September 2013); https://doi.org/10.1117/12.2023870

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KEYWORDS

Collimators

Light emitting diodes

Light sources

Light scattering

Optical design

Laser scattering

Ray tracing

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