标准号:IS 7848-1975
发布日期:1976/1/1 12:00:00
实施日期:1999/12/31 12:00:00
适用范围: This standard lays down the safety and performance requirements of studio spot-lights for use in motion picture studios, using tungsten filament lamps and employing a prismatic condenser lens and reflector, and designed to provide a substantially uniform beam, of variable divergence.