Xenon Origin and History 

was first discovered in England by chemists Sir William Ramsay and Morris William Travers on July 12, 1898, after discovering Krypton and Neon. Since Xenon is an odorless and colorless gas that exists only in trace amounts in the atmosphere, it is very difficult to take notice of it. Xenon and other noble gases were discovered by evaporating liquified air and collecting the residue. By cooling the air to below the boiling point (from gas to liquid), the air would condense to a liquid. The liquid air is then gradually warmed up, vaporizing lighter gases such as oxygen and nitrogen. Xenon gas can then be confined separately from the atmosphere. Collecting xenon is expensive because there is less than 1 parts per million in volume of the Earth's atmosphere. 

Xenon is most commonly used in light bulbs and as a general anesthetic. When it is trapped inside of a bulb, electricity discharged through the gaseous xenon would emit a bright light of the entire spectrum. These light bulbs are very common in automobile headlights, such as the Audi A4 light bulbs. Other common uses of Xenon are in X-rays, plasma display panels, and anesthetics. 

HID Xenon lights are brighter, stable and more economically friendly than regular halogen light bulbs. They do not look like regular halogen bulbs because halogen bulbs contain a bright filament. Instead, the xenon bulbs contain electrically charged xenon gas and metal halide; whenever they collide, the bulb becomes illuminated.