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A bulb that produces light by sending an electric current through mercury vapor which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the...
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A bulb that produces light the same as an incandescent bulb with the addition small amount of a halogen such as iodine or bromine added.
A bulb that produces light with a wire filament heated to a high temperature by an electric current passing through it.
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