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More recently, wider beam versions have become available designed for direct use on supply voltages of 120 or 230 V.

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). Quartz iodine lamps, using elemental iodine, were the first commercial halogen lamps launched by GE in 1959. The halogen cycle keeps the bulb clean and causes the light output to remain almost constant throughout the bulb's life. The production and importation of directional mains-voltage halogen bulbs was banned on 1 September 2016 and non-directional halogen bulbs followed on 1 September 2018.In June 2021, the UK government also announced plans to end the sale of halogen light bulbs from September, as part of the UK's wider efforts to tackle climate change. Incandescent lamp variety A halogen lamp operating in its fitting with the protecting glass removed A halogen lamp behind a round UV filter. Tungsten halogen lamps behave in a similar manner to other incandescent lamps when run on a different voltage. At moderate temperatures the halogen reacts with the evaporating tungsten, the halide formed being moved around in the inert gas filling. 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.

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. This allows the filament to operate at a higher temperature than a standard incandescent lamp of similar power and operating life; this also produces light with higher luminous efficacy and color temperature.The use of iodine was proposed in a 1933 patent, [4] which also described the cyclic redeposition of tungsten back onto the filament. The bulb must be made of fused silica (quartz) or a high-melting-point glass (such as aluminosilicate glass). In ordinary incandescent lamps, evaporated tungsten mostly deposits onto the inner surface of the bulb, causing the bulb to blacken and the filament to grow increasingly weak until it eventually breaks. A 300 watt tubular halogen bulb operated at full power quickly reaches a temperature of about 540°C (1,004°F), while a 500 watt regular incandescent bulb operates at only 180°C (356°F) and a 75 watt regular incandescent at only 130°C (266°F).