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Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps. It is also used in the flint (actually ferrocerium) of lighters.
In low-energy bulbs an electric discharge passes through argon gas containing mercury, which generates UV light. This in turn activates the coating on the inside surface of the bulb, which shines brightly. The coating includes five rare elements: cerium, europium, lanthanum, terbium and yttrium. They glow red, green and blue, which together we perceive as white light. What's inside? Lanthanum (La, element 57; emits green light)