本文件提供了取样、测试间隔和持续时间的指南和推荐程序，以及LED灯和灯具的长期光通量维护投影方法。其目的是帮助产品制造商和用户、标准制定机构和其他组织避免与过度产品测试相关的任何不必要的负担。一方面在测试时间和努力之间寻求平衡，另一方面则在足够的统计精确性之间寻求平衡。提出了光通量维持投影的直接法和组合法；后者允许使用为被测灯具或灯具以及其中使用的LED光源获得的光通量维护数据。

This document provides guidance and recommended procedures for sampling, test intervals and duration, and a method for long-term luminous flux maintenance projection for LED lamps and luminaires. The intent is to help product manufacturers and users, standards developing bodies, and other organizations to avoid any unnecessary burdens related to excessive product testing. A balance was sought between testing time and effort on one side, and sufficient statistical rigor on the other. A direct and a combined method for luminous flux maintenance projection are proposed; the latter allows the use of luminous flux maintenance data obtained for both the lamp or luminaire being tested as well as the LED sources used in it.