GB/T 20149-2006 in English

《GB/T 20149-2006道路交通信号灯 200mm圆形信号灯的光度特性》由TC224（全国照明电器标准化技术委员会）归口，TC224SC4（全国照明电器标准化技术委员会照明基础分会）执行，主管部门为中国轻工业联合会。
道路交通信号灯的能见度取决于许多因素，这些因素中最重要的是灯的颜色，发光强度以及发光强度分布。 本标准涉及200 mm道路交通信号灯的颜色、发光强度及发光强度的分布。本标准还包括太阳影象光这一重大问题，该问题会影响对光信号的正确识别。

Scope

The visibility of road traffic lights depends on many factors, the most important of which are the color of the lights, the luminous intensity and the distribution of luminous intensity. This standard involves the color, luminous intensity and distribution of luminous intensity of 200mm road traffic lights. This standard also covers the significant issue of solar image light, which affects the correct identification of light signals. This standard also lists in detail the reference documents on the color of road traffic lights.