1.Apply on the public square , airport , wharf, station, building lighting , advertisement plaque, exhibition center etc prefocus lighting .
适用于广场、机场、码头、车站及广告牌、展览馆等聚光照明。
2.Position camera on tripod and prefocus on inside of tank.
把相机固定于三脚架，预先对水缸内部调焦。
3.Electric Lamps - Condenser-Reflector, Four-Pin, Prefocus-Base Projection Lamps - Dimensions
电灯.聚光灯.四脚聚焦投影灯反射器.规格
4.Electric Lamps - Single-Contact Medium Prefocus Base-Down-Type Projection Lamps - Dimensions
电灯.灯头向下单触点中聚焦投影灯.规格
5.Dimensions for Projection Lamps - Four-Pin, Prefocus, Base-Down Type
放映灯规格.四脚预聚焦灯头向下型
6.Types and dimensions of prefocus caps
预聚焦式灯头的型式和尺寸