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 &circa; 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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