500 watt, tungsten halogen, medium to high voltage, single-ended Ushio’ s BTM bulb is frequently used in stage & studio lighting for its excellent color rendering and high performance lighting. This lamp is an excellent option for your stage & studio prices. Consumers should be aware that this bulb should be used in a base down/horizontal burning position in order to prevent color shift. Choose Ushio’ s BTM lamp, it’ s a bright idea!