DIN EN 60061-4-2010 灯头、灯座及检验其互换性和安全性的量规.第4部分:指南和通用信息
Lamp caps and holders together with gauges for the control of interchangeability and safety - Part 4: Guidelines and general information (IEC 60061-4:1990 + supplements A:1992, B:1994, C:1994, D:1995 + A5:1998 to A12:2009, modified); German version EN 600