electric discharge lamp
- or vapor lampLighting 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 с 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.
* * *also called Vapour Lamp,lighting device consisting of a transparent container within which a gas is energized by an applied voltage and thereby made to glow. The French astronomer Jean Picard (Picard, Jean) observed (1675) a faint glow in a mercury-barometer tube when it was agitated, but the cause of the glow (static electricity) was not then understood. The Geissler tube of 1855, in which gas at low pressure glowed when subjected to an electrical voltage, demonstrated the principle of the electric discharge lamp. After practical generators were devised in the 19th century, many experimenters applied electric power to tubes of gas. From about 1900, practical electric discharge lamps were in use in Europe and the United States. The French inventor Georges Claude (Claude, Georges) was the first to use neon gas, about 1910. Mercury vapour (mercury lamp) in a neon lamp gives a bluish light; mercury is used also in fluorescent lamps and some ultraviolet lamps. Helium in amber glass glows gold; blue light in yellow glass shows green; combinations of gases give white light.The sodium-vapour lamp, developed about 1931 in Europe, is a good illuminant if the yellow colour of its light is acceptable.The glow lamp, used as an indicator or a night-light, contains a high-resistance filament in a small bulb. The voltage difference between plates at the ends of this filament causes the enclosed gas, usually neon or argon, to glow faintly. It uses little power and lasts a long time. Because the glow discharge tends to keep the voltage across the lamp constant, it is sometimes used as a voltage regulator. See also arc lamp; fluorescent lamp.
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electric-discharge lamp — noun an electric lamp in which the light comes from an electric discharge between two electrodes in a glass tube • Syn: ↑gas discharge lamp • Hypernyms: ↑electric lamp … Useful english dictionary
discharge lamp — a lamp in which light is produced by an electric discharge in a gas filled glass enclosure. [1935 40] * * * … Universalium
discharge lamp — noun Date: 1933 an electric lamp in which an enclosed gas or vapor glows or causes a phosphor coating on the lamp s inner surface to glow … New Collegiate Dictionary
gas-discharge lamp — noun an electric lamp in which the light comes from an electric discharge between two electrodes in a glass tube • Syn: ↑electric discharge lamp • Hypernyms: ↑electric lamp … Useful english dictionary
Gas-discharge lamp — See also: Gas filled tube Germicidal lamps are simple low pressure mercury vapor discharges in a fused quartz envelope. Gas discharge lamps are a family of artificial light sources that generate light by sending an electrical discharge through an … Wikipedia
High-intensity discharge lamp — A High intensity discharge (HID) lamp is a type of electrical lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina tube. This tube is filled… … Wikipedia
High-Intensity Discharge Lamp — A lamp that consists of a sealed arc tube inside a glass envelope, or outer jacket. The inner arc tube is filled with elements that emit light when ionized by electric current. A ballast is required to provide the proper starting voltage and to … Energy terms
lamp — lampless, adj. /lamp/, n. 1. any of various devices furnishing artificial light, as by electricity or gas. Cf. fluorescent lamp, incandescent lamp. 2. a container for an inflammable liquid, as oil, which is burned at a wick as a means of… … Universalium
electric lamp — noun a lamp powered by electricity • Hypernyms: ↑lamp • Hyponyms: ↑arc lamp, ↑arc light, ↑electric discharge lamp, ↑gas discharge lamp, ↑flashlight, ↑torch, ↑ … Useful english dictionary
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