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Proceedings Paper

Design and development of a light module for constant climate chambers based on LED technology
Author(s): Paola Belloni; David Rose; Daniel Molini-Vazquez
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Paper Abstract

The rapid improvement of the LED-efficiency in the visible range and the availability of UVA-LEDs motivated us to perform a feasibility study focused on developing a light module powered only with LED sources for photostability tests in constant climate chambers. We first carried out a market analysis to identify suitable LEDs for this application. Secondly, a new opto-mechanical light module was developed and optically simulated with the software LightTools®. The geometrical distribution of all LEDs was optimized to provide uniform illumination at a given distance and a spectral distribution according to the guideline ICHQ1b for photostability tests. Finally, an opto-mechanical prototype was built up and measured. Both irradiance/illuminance measured values and spectral distribution were in very good agreement with the optical simulation values. The uniformity too was better than predicted and within the 10% target value. Nevertheless, in a further optimization, a 3D-textures pattern was added on the front size of the glass plate located under the LEDs. According to the final optical simulation results this typical backlighting optimization provides an additional improvement of the uniformity. In conclusion, we have demonstrated that LEDs can already provide an efficient optical alternative to classical fluorescent lamps in this demanding industrial application field. But two few UVA-LEDs with the right wavelength and power are available on the market. And none has undergone the reliability tests required by this application (humidity, temperature, lifetime )

Paper Details

Date Published: 18 December 2012
PDF: 7 pages
Proc. SPIE 8550, Optical Systems Design 2012, 85502E (18 December 2012); doi: 10.1117/12.981146
Show Author Affiliations
Paola Belloni, Hochschule Furtwangen Univ. (Germany)
David Rose, Hochschule Furtwangen Univ. (Germany)
Daniel Molini-Vazquez, Univ. Complutense de Madrid (Spain)

Published in SPIE Proceedings Vol. 8550:
Optical Systems Design 2012
Laurent Mazuray; Daniel G. Smith; Jean-Luc M. Tissot; Tina E. Kidger; Frank Wyrowski; Stuart David; Rolf Wartmann; Jeffrey M. Raynor; Andrew P. Wood; Pablo Benítez; Andreas Erdmann; Marta C. de la Fuente, Editor(s)

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