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Proceedings Paper

Overview Of Advances In Light Sources
Author(s): Donald D. Hollister
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Paper Abstract

Current efforts at the Lawrence Berkeley Laboratory to improve the operational efficiency of fluorescent lamps are based upon novel techniques intended to reduce internal resonance radiative transport losses. Such losses have been associated with "entrapment" of resonance radiation in the optically thick positive column of the mercury vapor discharge. Two promising techniques for entrapment reduction are provided respectively to selective mercury isotope enrichment and by the broadening of the hyper-fine structure (hfs) of the resonance line X2537 via the Zeeman effect. These techniques have, thus far, led to fluorescent lamp UV production efficiency enhancements, respectively of about 6.8% and 7%. Additional efforts to improve HID sources are in progress. Interesting metallic halides have been combined with electrodeless arc technology to produce a laboratory discharge system operating with an efficacy exceeding 170 lumens per watt, and a color rendering index (CRI) of 52.

Paper Details

Date Published: 23 February 1987
PDF: 8 pages
Proc. SPIE 0692, Materials and Optics for Solar Energy Conversion and Advanced Lightning Technology, (23 February 1987); doi: 10.1117/12.936702
Show Author Affiliations
Donald D. Hollister, University of California (United States)

Published in SPIE Proceedings Vol. 0692:
Materials and Optics for Solar Energy Conversion and Advanced Lightning Technology
Sandor Holly; Carl M. Lampert, Editor(s)

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