Metal Halide Lamps supplied to the reprographic industry are dosed with the iodides of iron, tin and gallium. In addition to the lamp’s pseudo-continuum in the 300 to 450 nm range, the gallium adds a strong desirable line at 420 nm.
These lamps can be operated from quarter power to full power using the proper switching circuits. The lamps are available in the 4000 to 7000 watt range.