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Proceedings Paper

Replacement of fluorescent lamps with high-brightness LEDs in a bridge lighting application
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Paper Abstract

There are many advantages that LEDs offer for use in general illumination. The use of LEDs in certain applications can provide improved energy efficiency. For example, in traffic lights in the United States, LED technology has taken over the market not only because of the energy savings as compared to standard incandescents, but also because of the reduced maintenance costs associated with bulb replacement and improved reliability. With useful lifetimes exceeding 40,000 hours or more, today's high flux LEDs can provide illumination solutions with replacement periods of 8 to 10 years or more. This paper will examine a bridge roadway lighting feasibility study which the authors' company recently undertook. The application required the LED units to reproduce the photometric performance of 64-inch (1.625m) fluorescent lamps. In addition, the LED units were required to survive a harsh, outdoor marine environment with an expected lifetime of 7 years or more. To achieve these results, a number of design elements were studied including: optimum heat dissipation in a sealed enclosure, ease of installation, and design of power supplies having expected lifetimes to match the LED light engines. Results of these studies will be discussed as well as illustrations of the designs chosen.

Paper Details

Date Published: 12 September 2006
PDF: 11 pages
Proc. SPIE 6337, Sixth International Conference on Solid State Lighting, 633719 (12 September 2006); doi: 10.1117/12.682727
Show Author Affiliations
John W. Curran, Dialight Corp. (United States)
Shawn P. Keeney, Dialight Corp. (United States)

Published in SPIE Proceedings Vol. 6337:
Sixth International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Tsunemasa Taguchi; Ian E. Ashdown, Editor(s)

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