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electric discharge lamp

   Also found in: Wikipedia 0.03 sec.

electric discharge lamp

 or vapor lamp

Lighting device consisting of a transparent container within which a gas is energized by an applied voltage and made to glow. After practical generators were devised in the 19th century, many experimenters applied electric power to tubes of gas. From c. 1900, electric discharge lamps were in use in Europe and the U.S. Fluorescent, neon, mercury, sodium, and metal-halide lamps are of the electric discharge variety.
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A ballast is a device used with an electric discharge lamp, such as fluorescent and high-intensity discharge lamps like those used in sporting arenas, to obtain the necessary circuit conditions that start the lamp and keep it operating.
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