- A gas-filled lamp containing a small proportion of one or more halogens.
- A halogen lamp (1) whose contained gas is iodine, or that of another halogen or mixture of halogens, and whose filament is composed of tungsten. The gas in these high-efficiency lamps reacts with the tungsten metal which evaporates, recycling the particles back onto the filament surface. Also called tungsten-halogen lamp.
- noun a type of light source popular in lighting rigs, which uses quartz. It is more long-lasting than tungsten but can give off intense heat.