Halogen capsules are basically energy efficient halogen lamps with high brightness of the emitted light and have a long life. They work on the principle of miniature bubble with an incandescent filament, in which has a small amount of added halogen gas. The combination of the halogen gas and the tungsten incandescent filament produces a cyclic chemical reaction which results in the emission of light. The tiny size of the halogen capsules allows them to be used in a variery of projects.