Xenon Flashlights Xenon flashlights. Xenon is a type of gas that is used in 2 ways within flashlights. Some Xenon flashlights trap some xenon gas within a filament based bulb. The Xenon gas may change the color of the light radiated by the filament, but ultimately the filament is responsible for producing the light. The Xenon won't make it any brighter. This is a typical implementation in lower cost Xenon flashlights. More expensive flashlights, like high intensity discharge lights actually use electrodes to fire a spark that ignites a paste inside the bulb. The paste vaporizes and the Xenon gas burns. The Xenon gas actually produces the light. The composition of the paste and the burning vapor produced dictates the color range. Gases with more Xenon composition burn in the 4000-5000 kelvin range (daylight/sunlight), while gases with metal halide composition burn in the 6000-7000 kelvin range (bluish/white).