Xenon capsules create a light from an electrical discharge between two electrodes in an environment of metal and halide salts, mercury, and xenon gas hermetically sealed in a quartz capsule. Hella's xenon capsules provide a blue-white light source that is very close to natural daylight and delivers at least 70% more light at a lower wattage that traditional lamps. Xenon capsules should be use exclusively with xenon lamps / ballasts.