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Regeneration of the filament is also possible with fluorine, but its chemical reactivity is so great that other parts of the lamp are attacked.

Tungsten halogen lamps behave in a similar manner to other incandescent lamps when run on a different voltage. The first lamps used only tungsten for filament supports, but some designs use molybdenum – an example being the molybdenum shield in the H4 twin filament headlight for the European Asymmetric Passing Beam.

The combination of the halogen gas and the tungsten filament produces a halogen-cycle chemical reaction, which redeposits evaporated tungsten on the filament, increasing its life and maintaining the clarity of the envelope.

Australia banned some halogen light bulbs above 10W from September 2021,replaced by eco halogen, [7] Later than the planned date of September 2020 [8] to keep the policy in line with the European Union. Halogen lamps made for 12 to 24 volt operation have good light outputs, and the very compact filaments are particularly beneficial for optical control (see picture). The use of iodine was proposed in a 1933 patent, [4] which also described the cyclic redeposition of tungsten back onto the filament. The tungsten released in hotter regions does not generally redeposit where it came from, so the hotter parts of the filament eventually thin out and fail.At some point, however, it will reach higher temperature regions within the bulb where it then dissociates, releasing tungsten back onto the filament and freeing the halogen to repeat the process. Quartz iodine lamps, using elemental iodine, were the first commercial halogen lamps launched by GE in 1959. of multifaceted reflector "MR" lamps of 20–50 watts were originally conceived for the projection of 8 mm film, but are now widely used for display lighting and in the home.