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Quartz bulbs with gas filling that includes a halogen. The halogen combines with the tungsten evaporated from the hot filament to form a compound that is attracted back to the filament, thus extending the filament’s life and preventing from condensation on the bulb that darkens, an effect that reduces the light output of ordinary incandescent lamps. First used in the late 1960s in the motion-picture industry, halogen bulbs are not commonly used in automobile headlights, residential lighting, and underwater photography.