Quartz Tungsten Halogen (QTH) lamps are popular visible and near infrared sources because of their smooth spectral curve and stable output. They do not have the sharp spectral peaks that arc lamps exhibit, and they emit little UV radiation, see the spectral irradiance curves of our QTH lamps.
Our QTH lamps use a doped tungsten filament inside a quartz envelope. They are filled with rare gas and a small amount of halogen. Current flowing through the filament heats the tungsten to >3000 K. The filaments of our 10 to 250 W lamps are dense planar structures for highest image brightness. The white light produced radiates through the clear quartz envelope.

Quartz Tungsten Halogen (QTH) lamps are popular visible and near infrared sources because of their smooth spectral curve and stable output. They do not have the sharp spectral peaks that arc lamps exhibit, and they emit little UV radiation, see the spectral irradiance curves of our QTH lamps.
Our QTH lamps use a doped tungsten filament inside a quartz envelope. They are filled with rare gas and a small amount of halogen. Current flowing through the filament heats the tungsten to >3000 K. The filaments of our 10 to 250 W lamps are dense planar structures for highest image brightness. The white light produced radiates through the clear quartz envelope.