Second, the intensity of the tungsten halogen lamps could be reduced in order to lower the thermal heating of plant canopies.
Early color film scanners used a halogen lamp and a three-color filter wheel, so three exposures were needed to scan a single color image.
Currently, it is lit by a halogen lamp.
The halogen lamp can operate its filament at a higher temperature than a standard gas filled lamp of similar power without loss of operating life.
In a halogen lamp, filament evaporation is prevented by a chemical process that redeposits metal vapor onto the filament, extending its life.
The white light is generated by a halogen lamp and modulated.
Most overheads use an extremely high-power halogen lamp that may consume up to 750 watts.
A conventional quartz halogen lamp is used in place of the reflector lamp.
