500W 120V, tungsten halogen, medium to high voltage, single-ended OSRAM’ s BTM lamp 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 S90 burning position in order to prevent color shift. Choose OSRAM’ s BTM lamp, it’ s a bright idea!