American National Standard for Roadway and Area Lighting Equipment-Metal Heads and Reflector Assemblies-Mechanical and Optical Interchangeability
美国道路和区域照明设备国家标准金属头和反射器组件机械和光学互换性
ANSI C136.6-2004 (R2012, R2018) covers dimensional features of luminaires with metal heads that permit mechanical and optical interchangeability of head and reflector assemblies.