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Proceedings Paper

Accelerated optical polymer aging studies for LED luminaire applications
Author(s): Edgar Estupiñán; Peter Wendling; Marijan Kostrun; Richard Garner
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Paper Abstract

There is a need in the lighting industry to design and implement accelerated aging methods that accurately simulate the aging process of LED luminaire components. In response to this need, we have built a flexible and reliable system to study the aging characteristics of optical polymer materials, and we have employed it to study a commercially available LED luminaire diffuser made of PMMA. The experimental system consists of a “Blue LED Emitter” and a working surface. Both the temperatures of the samples and the optical powers of the LEDs are appropriately characterized in the system. Several accelerated aging experiments are carried out at different temperatures and optical powers over a 90 hour period and the measured transmission values are used as inputs to a degradation model derived using plausibility arguments. This model seems capable of predicting the behavior of the material as a function of time, temperature and optical power. The model satisfactorily predicts the measured transmission values of diffusers aged in luminaires at two different times and thus can be used to make application recommendations for this material. Specifically, at 35000 hours (the manufacturer’s stated life of the luminaire) and at the typical operational temperature of the diffuser, the model predicts a transmission loss of only a few percent over the original transmission of the material at 450 nm, which renders this material suitable for this application.

Paper Details

Date Published: 30 September 2013
PDF: 19 pages
Proc. SPIE 8835, LED-based Illumination Systems, 883502 (30 September 2013); doi: 10.1117/12.2024044
Show Author Affiliations
Edgar Estupiñán, OSRAM SYLVANIA Inc. (United States)
Peter Wendling, OSRAM SYLVANIA Inc. (United States)
Marijan Kostrun, OSRAM SYLVANIA Inc. (United States)
Richard Garner, OSRAM SYLVANIA Inc. (United States)

Published in SPIE Proceedings Vol. 8835:
LED-based Illumination Systems
Jianzhong Jiao, Editor(s)

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