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Proceedings Paper

Practical optical design of an LED collimator
Author(s): H. Rehn
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Paper Abstract

We present a detailed investigation of an optical system which couples the light of a Lambertian Source (for example, a high power LED array) to an equal etendue target. Such a system can be applied for gobo illumination or for illuminating a lightguide. Though the efficiency of such a system may by ideal in theory, real-world constraints make it imperfect. The actual light collection angle by the target may play a role, and requirements such as the clearance between the optics and source or target and the maximum system diameter will have an influence on imaging and non-imaging designs. As for some applications an uniform illumination of the target may be required, we finally analyze the ability of various designs to deliver homogeneity.

Paper Details

Date Published: 23 September 2015
PDF: 8 pages
Proc. SPIE 9629, Optical Systems Design 2015: Illumination Optics IV, 962907 (23 September 2015); doi: 10.1117/12.2191217
Show Author Affiliations
H. Rehn, OSRAM AG (Germany)


Published in SPIE Proceedings Vol. 9629:
Optical Systems Design 2015: Illumination Optics IV
Tina E. Kidger; Stuart David, Editor(s)

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