阵列型LED灯具远场距离分析

Far-field distance analysis of LED array luminaries

LED灯具通常为阵列式排布的面光源,为实现对灯具光强分布进行准确测量,照度探测器需要距离待测灯具足够远,使得面光源可近似为点光源,该距离即为远场距离。针对目前对远场距离进行规定的多项国家标准相互间不统一,且标准只考虑灯具发光面最大尺寸单一参数等问题,对阵列排布式LED灯具的远场距离进行研究,计算了不同配光分布、阵列排布方式、阵列密度、阵列尺寸下灯具的远场距离,并详细分析各参数对远场距离的影响,给出远场距离设定的建议,为确定阵列型LED灯具远场距离的光强分布的准确测量提供参考。

Light emitting diode （LED） has been the most popular lighting source around the world for its varieties of advantages such as energy-saving, environmental friendly, seismic and longeval. LED luminaries are usually assembled by aligned packaged LED dies, which are sur- face sources. In order to measure the light distribution accurately, the detector should be placed far enough away from the luminary. The measurement distance is called far-field dis- tance which makes the surface source be considered as the point source. There are a variety of national standards defining the value of far-field distance~ however, the defined distances are different from each other and only the impacts of the maximum source size are considered. In this study, the far-field distance of LED array luminary was investigated. The far-field distance of lamps with different intensity distributions, LED array sizes, LED array arrangement densi- ties and LED array arrangement styles were calculated first. Then, the impacts of these pa- rameters on far-field distance were analyzed. Finally, suggests to determine the far-field dis- tance of LED array luminaries were given. This research could offer reference for the accurate measurement of the far-field distance intensity distribution of LED array luminary.