The 575 watt Halogen lamps from USHIO are designed as a medium wattage alternative to the FKW 300W and FRK 650W lamps used in theatrical fresnels. These medium wattage lamps allow for two instruments to be used on a 1200 watt capacity dimming channel while maximizing the light output. The Halogen capsule utilizes a bi-plane filament design and incorporates a special gas mixture to prevent overheating and lamp darkening in smaller and hotter instrument designs.