规定了三种灯的螺纹形式和尺寸以及灯及其外壳的基本尺寸:提供近端和远端照明的内窥镜仪器用A型灯；B型灯，类似于A型，但更小，适用于支气管镜；C型膀胱镜灯有三种尺寸。购买本文件时可获得的所有当前修订均包含在购买本文件中。

Specifies the form and size of screw thread and the essential dimensions of lamps and their housings for three types of lamp: Type A lamp for endoscopic instruments giving proximal and distal illumination; Type B lamp, similar to Type A but smaller, suitable for use in bronchoscopes; and Type C, cystoscope lamps in three sizes.All current amendments available at time of purchase are included with the purchase of this document.