DIN EN 60061-4-2008 灯头和灯座及其互换性和安全性的控制量规.第4部分:指南和通用信息(IEC 60061-4-1990 + 补充件 A:1992、B:1994、C:1994和 D:1995 + 修正的A5:1998 到 A11:2007)
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 A11:2007, modified); German version EN 600