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Proceedings Paper

Accurate colorimetric feedback for RGB LED clusters
Author(s): Kwong Man; Ian Ashdown
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Paper Abstract

We present an empirical model of LED emission spectra that is applicable to both InGaN and AlInGaP high-flux LEDs, and which accurately predicts their relative spectral power distributions over a wide range of LED junction temperatures. We further demonstrate with laboratory measurements that changes in LED spectral power distribution with temperature can be accurately predicted with first- or second-order equations. This provides the basis for a real-time colorimetric feedback system for RGB LED clusters that can maintain the chromaticity of white light at constant intensity to within ±0.003 Δuv over a range of 45 degrees Celsius, and to within 0.01 Δuv when dimmed over an intensity range of 10:1.

Paper Details

Date Published: 12 September 2006
PDF: 8 pages
Proc. SPIE 6337, Sixth International Conference on Solid State Lighting, 633702 (12 September 2006); doi: 10.1117/12.683239
Show Author Affiliations
Kwong Man, TIR Systems Ltd. (Canada)
Ian Ashdown, TIR Systems Ltd. (Canada)


Published in SPIE Proceedings Vol. 6337:
Sixth International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Tsunemasa Taguchi; Ian E. Ashdown, Editor(s)

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