IEC 60809:2021适用于用于汽车应用的电光源，例如用于道路车辆的道路照明装置和/或光信号装置。 它特别适用于联合国决议R.E.5中列出的光源和受其他立法约束的光源。 本第四版取消并取代了2014年发布的第三版、修正案1:20 17、修正案2:20 17和修正案3:20 19。本版构成技术修订版。 与上一版相比，此版本包括以下重大技术变更: a)介绍用于前照明应用的LED光源的光技术测量。 b)由于以前版本的原始数据表和一些数字没有可编辑格式，因此按照当前的起草规则从旧格式复制，现在采用单一语言格式。有些复制品构成了对原文部分和原图的微小（明显）编辑改动；未引入技术变更。

IEC 60809:2021 is applicable to electric light sources for use in automotive applications, for example in road illumination devices and/or light signalling devices for road vehicles.
It is especially applicable to light sources listed in UN Resolution R.E.5 and light sources subject to other legislations.
This fourth edition cancels and replaces the third edition published in 2014, Amendment 1:2017, Amendment 2:2017 and Amendment 3:2019. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Introduction of a light technical measurement on LED light sources intended for use in front-lighting applications.
b) As the original data sheets and some figures from previous editions were not available in an editable format, they have been reproduced from their old format, following the current drafting rules and are now in single language format. Some reproductions constitute minor (obvious) editorial changes of the original text sections and original figures; no technical changes were introduced.