High-intensity Discharge Lamp
High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. This tube is filled with both gas and metal salts. The gas facilitates the arc's initial strike. Once the arc is started, it heats and evaporates the metal salts forming a plasma, which greatly increases the intensity of light produced by the arc and reduces its power consumption. High-intensity discharge lamps are a type of arc lamp.
High-intensity discharge lamps make more visible light per unit of electric power consumed than fluorescent and incandescent lamps since a greater proportion of their radiation is visible light in contrast to heat.
Read more about High-intensity Discharge Lamp: Construction, Radioactive Substances, Applications, End of Life
Famous quotes containing the words discharge and/or lamp:
““Weren’t you relieved to find he wasn’t dead?”
“No! and yet I don’t know it’s hard to say.
I went about to kill him fair enough.”
“You took an awkward way. Did he discharge you?”
“Discharge me? No! He knew I did just right.””
—Robert Frost (1874–1963)
“Thus he struggled, by every method, to keep his light shining before men. Surely the lighthouse-keeper has a responsible, if an easy, office. When his lamp goes out, he goes out; or, at most, only one such accident is pardoned.”
—Henry David Thoreau (1817–1862)