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

机译：在桥梁照明应用中用高亮度LED替换荧光灯

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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.
机译：LED具有许多优点，可用于一般照明。在某些应用中使用LED可以提高能源效率。例如，在美国的交通灯中，LED技术已经占领了市场，这不仅是因为与标准白炽灯相比节省了能源，还因为与灯泡更换相关的维护成本降低以及可靠性提高。随着超过40,000小时或更长的使用寿命，当今的高通量LED可以为照明解决方案提供8至10年甚至更长的更换时间。本文将研究作者公司最近进行的桥梁巷道照明可行性研究。该应用要求LED单元能够再现64英寸（1.625m）荧光灯的光度性能。另外，LED单元需要在恶劣的室外海洋环境中生存，预期使用寿命为7年以上。为了获得这些结果，研究了许多设计元素，包括：密封外壳中的最佳散热，易于安装以及具有预期寿命以匹配LED光引擎的电源设计。将讨论这些研究的结果以及所选设计的插图。

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