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Proceedings Paper

Effects of chemical dose in increasing the output and system efficacy of short arc metal halide lamps
Author(s): Charles N. Stewart; Timothy D. Russell; Douglas M. Rutan
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Paper Abstract

Compact LCD projectors require compact, low power metal halide lamps to achieve maximum screen brightness. We have previously described such lighting systems, taking into account ballast stability, source etendue, and collection optics. Metal halide sources have a significant advantage over high pressure xenon, high pressure mercury, and halogen sources in that the spectral power distribution of the source can be optimized for the projection system. This is in addition to the inherently greater luminous efficacy of metal halide source. We present the result of recent studies on chemical dose composition in 50 Watt, 1.2 mm arc gap, long life metal halide lamps. Through designed experiments on chemical species, dose weight, and molar composition we were able to increase the luminous output by as much as 50 percent in some cases. The optimized metal halide lamp has 50 percent more red radiation than a 50 Watt, 1.3 mm gap high pressure mercury lamp and also produces a preferred color temperature. Knowledge of the significant factors that effect color allows us to design virtually any color gamut. It was possible to match the filter characteristics of a number of projection systems.

Paper Details

Date Published: 20 May 1999
PDF: 9 pages
Proc. SPIE 3634, Projection Displays V, (20 May 1999); doi: 10.1117/12.349362
Show Author Affiliations
Charles N. Stewart, Welch Allyn, Inc. (United States)
Timothy D. Russell, Welch Allyn, Inc. (United States)
Douglas M. Rutan, Welch Allyn, Inc. (United States)


Published in SPIE Proceedings Vol. 3634:
Projection Displays V
Ming Hsien Wu, Editor(s)

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