Profile: Anderson Thermal Devices, Inc. offers infrared heaters. T3 and T4 lamps utilize a low mass tungsten filament to provide a high temperature source that responds rapidly to voltage changes? allowing for precise control. Lamps are hermetically sealed and filled with an inert halogen gas. The lamps are available with a white ceramic or gold reflector coating on the back of the lamp to make them unidirectional. Ruby Red colored quartz lamps are available for filtering out most of the high intensity visible light. QF style heater is an economical and rugged heater with quartz fabric as the radiating face of the heater. The elements are right behind the quartz fabric which is laminated to a 1? thick refractory material. The heater has 3? deep aluminized steel housing and has mounting studs and a junction box in the back.