A comprehensive model to predict solid state lighting performance

Marc Salsbury; Ian Ashdown

doi:10.1117/12.732528

14 September 2007 A comprehensive model to predict solid state lighting performance

Marc Salsbury, Ian Ashdown

Proceedings Volume 6669, Seventh International Conference on Solid State Lighting; 666919 (2007) https://doi.org/10.1117/12.732528
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

A tool to predict the behavior of LED-based luminaires is critical to their design. In the absence of such a tool, the design process becomes quite laborious and highly dependant on expensive experimental work. Unfortunately, thermal effects can make the system level behavior very difficult to predict: a change in temperature causes a change in spectral characteristics, which in turn causes an adjustment to the balance of the LEDs, affecting the heat load, and thereby once again changing the spectral characteristics. In order to accurately predict how a SSL luminaire will behave, it is necessary to model it at the system level. An accurate model must consider heat loading/dissipation, the response of electrical components to temperature, the effect of temperature on spectral characteristics (including intensity, spectral bandwidth, and peak wavelength), and then recursively recalculate the heat load. We have developed just such a model for a luminaire employing optical feedback and thermal feedforward. The model makes use of measured data for the components, and computes its system-level behavior. The model also computes the change in behavior due to aging, based on the junction temperature. The model has been verified by experiment, and found to agree to within ten percent. The aging predictions have not yet been verified.

Citation Download Citation

Marc Salsbury and Ian Ashdown "A comprehensive model to predict solid state lighting performance", Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 666919 (14 September 2007); https://doi.org/10.1117/12.732528

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