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Message: <blockquote data-quote="SRT Handz" data-source="post: 348643" data-attributes="member: 8001">High-intensity discharge (HID) lamps are electrical lamps producing 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 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.Compared with fluorescent and incandescent lamps, HID lamps have much higher efficacy: they give a greater amount of light output per watt of electricity input.<img src="http://greg.whoopdee.com/HID.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>