Original: Illumination and optics Gas-discharge lamps Xenon is used in light-emitting devices called xenon flash lamps , which are used in photographic flashes and stroboscopic lamps ; to excite the active medium in lasers which then generate coherent light ; and , occasionally , in bactericidal lamps .
Simplified: Xenon gas is used in electron tubes , bactericidal lamps , stobe lamps , and lamps used to excite ruby lasers .