Etendue conserved color mixing

R. P. van Gorkom; M. A. van As; G. M. Verbeek; C. G. A. Hoelen; R. G. Alferink; C. A. Mutsaers; H. Cooijmans

doi:10.1117/12.733748

26 September 2007 Etendue conserved color mixing

R. P. van Gorkom, M. A. van As, G. M. Verbeek, C. G. A. Hoelen, R. G. Alferink, C. A. Mutsaers, H. Cooijmans

Proceedings Volume 6670, Nonimaging Optics and Efficient Illumination Systems IV; 66700E (2007) https://doi.org/10.1117/12.733748
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

Colored variable lighting is being used in more and more locations to enhance the "beauty" and "atmosphere" of interiors and exteriors. Lamps based on different colored LED are an obvious choice for such systems. The light from the differently colored LEDS needs to be mixed together very well because otherwise objects in the beam could create colored shadows. The difficulty is that we often want a lighting system where the light is collimated, where we can set the color of the beam, and where the lamp is as small as possible with an as small as possible exit diameter. This means that ideally we would like to mix colors etendue preserving. In this paper we discuss a new method of color mixing with dichroic color filters, which aims to achieve this. It is based on a special arrangement of the color filters, whereby the filters act as collimators. We have build prototypes and have done raytracing simulations. These show that we can indeed mix light of different wavelengths and make relatively small, color-variable, collimated, high brightness, light-sources. The advantages are an increase in brightness, a reduction/elimination of the colored shadows, and a small volume. This new method can, e.g., be used in spotlights, mini-beamers and logo projectors.

Citation Download Citation

R. P. van Gorkom, M. A. van As, G. M. Verbeek, C. G. A. Hoelen, R. G. Alferink, C. A. Mutsaers, and H. Cooijmans "Etendue conserved color mixing", Proc. SPIE 6670, Nonimaging Optics and Efficient Illumination Systems IV, 66700E (26 September 2007); https://doi.org/10.1117/12.733748

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available