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 surface 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 distance 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 densities and LED array arrangement styles were calculated first. Then, the impacts of these parameters on far-field distance were analyzed. Finally, suggests to determine the far-field distance 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.