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 0441; 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.