Mercury-vapor lamp

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Mercury-vapor lamps producing a blue light

A mercury-vapor lamp is a special lamp. It makes light by a spark in a tube that contains mercury. The spark makes the mercury atoms release ultraviolet light. The ultraviolet light shines on phosphors which make white light from it. The EU wants to ban them because they contain large amounts of mercury and are not efficient like fluorescent bulbs. They last much longer though. They are the bluish streetlights.

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