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Luminaire Dirt Depreciation (LDD): Field Data from Several Exterior Lighting Projects

机译：灯具污垢折旧（LDD）：来自多个外部照明项目的现场数据

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摘要

Luminaire dirt depreciation (LDD) data were evaluated for seven luminaires from three different project sites in Philadelphia, Pennsylvania, Minneapolis, Minnesota, and Yuma, Arizona. In each case, the luminaires were removed from the installation, carefully packaged and transported to a photometric testing laboratory, and then tested in the "as-is" or dirty condition, cleaned, and retested. In terms of light output, the results showed that the IES RP-36-15 method for estimating LDD was applicable to the light emitting diode (LED) luminaires evaluated. General claims of lower levels of dirt deprecation (or higher LDD values) for LED luminaires than for luminaires using conventional light sources were not supported by the test data for the LED luminaires in these three projects. Though the overall measured lumen depreciation due to accumulated dirt closely matched IES estimates for LDD, the data indicated that the accumulated dirt on the luminaires dramatically altered the luminous intensity distribution of the luminaires, with reductions in intensity of more than 25% at peak angles. These effects on luminous intensity distribution are not accounted for in IES LDD estimates.
机译：对来自宾夕法尼亚州费城，明尼阿波利斯，明尼苏达州和亚利桑那州尤马市三个不同项目地点的七种灯具的灯具污垢折旧（LDD）数据进行了评估。在每种情况下，将灯具从设备中取出，仔细包装并运输到光度测试实验室，然后在“原样”或肮脏的条件下进行测试，清洁并重新测试。在光输出方面，结果表明，用于估算LDD的IES RP-36-15方法适用于所评估的发光二极管（LED）照明设备。在这三个项目中，LED照明器的测试数据不支持LED照明器的污垢折旧率较低（或LDD值较高）的一般主张，而不是使用传统光源的照明器。尽管由于累积的污垢导致的整体测量流明折旧与LDD的IES估算值非常接近，但数据表明，照明器上的累积污垢极大地改变了照明器的发光强度分布，在峰值角强度降低了25％以上。 IES LDD估算中未考虑这些对发光强度分布的影响。

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