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The light is emitted from an arc discharge between two closely spaced electrodes hermetically sealed inside a small quartz glass tubular envelope capsule. Additional Article Information: =============================== 460 Words; formatted to 65 Characters per Line Distribution Date and Time: 2008-03-03 13:24:00 Written By: Magnalight Copyright: 2008 Contact Email: mailto:[EMAIL PROTECTED] For more free-reprint articles by Magnalight, please visit: http://www.thePhantomWriters.com/recent/author/magnalight.html ============================================= Special Notice For Publishers and Webmasters: ============================================= If you use this article on your website or in your ezine, We Want To Know About It. Use the following URL to let us know where you have used this article, and we will include a link to your website on thePhantomWriters.com: http://thephantomwriters.com/notify.php?id=5757&p=load HTML Copy-and-Paste and TEXT Copy-and-Paste Versions Of Article Are Available at: http://thePhantomWriters.com/free_content/db/m/understanding-hid-light-technology.shtml#get_code --------------------------------------------------------------------- Understanding HID Light Technology Copyright (c) 2008 Magnalight Magnalight http://www.magnalight.com High Intensity Discharge (HID) lighting technology replaces the filament of the light bulb with a capsule of gas. The light is emitted from an arc discharge between two closely spaced electrodes hermetically sealed inside a small quartz glass tubular envelope capsule. To operate, they require ballasts, which supply proper voltage and control current. The amount of light produced is greater than a standard halogen bulb, while consuming less power, and more closely approximating the color temperature of natural daylight. In all High Intensity Discharge lamps, light is produced by passing a current through a metal vapor. Free electrons colliding with an atom in the vapor momentarily knock an electron into a higher orbit of the atom. When the displaced electron falls back to its former level, a quantum of radiation is emitted. The wavelength of radiation depends on the energy zone of the disturbed electron and on the type of metal vapor used in the arc tube. HID lighting has several advantages over conventional halogen primary lights: * More light output. The HID lamp's lumens per watt (LPW) efficacy is roughly six to eight times that of an incandescent lamp. * Whiter light. The color temperature of HID lighting more closely approximates the color temperature of natural daylight than does a halogen system, which appears yellowish in comparison. We use the term "correlated color temperature" to indicate that the light appears as if the discharge lamp is operating at a given color temperature-- traditional measurements of color temperature are drawn from the properties of the metal used in the bulb's filament. Typical color temperatures are 2800K (incandescent), 3000K (halogen), 4100K (cool white or SP41 fluorescent), and 5000K (daylight-simulating fluorescent colors). A white light has a perceived brightness which may equate to the higher stated efficacies-- ie., although an HID lamp might have equivalent lumens as a higher wattage halogen bulb, the HID will appear brighter and more pleasing to the eye than the output of a halogen lamp. * Longer Service Life. An HID lamp will last, on the average, 3 to 5 times as long as a halogen bulb. In normal use, an HID bulb should last beyond one thousand ignitions. The ballast in an HID lighting system generally has two purposes. It provides the proper starting voltage to strike and maintain the arc, and it regulates the proper current to the lamp once the arc is established. Ballasts are not interchangeable among different types of HID lamps. A ballast design incorporates electronic circuitry to provide specific lamp/ballast operating characteristics. As an example, the effects of line voltage variations on resultant changes of lamp wattage are a function of the ballast circuit design. Requirements for a circuit which will provide a finer degree of lamp regulation generally result in a higher ballast cost. --------------------------------------------------------------------- This article has been written by the staff of Magnalight.com MagnaLight meets the high powered lighting needs for a variety of industries including the military. They also offer a number of lights for use by hunters, fishermen, and outdoor enthusiasts. They provide a wide-selection of Magnalight Spotlights, Boat Lights, 24 Volt Lights and more. http://www.magnalight.com --- END ARTICLE --- Get HTML or TEXT Copy-and-Paste Versions Of This Article at: http://thePhantomWriters.com/free_content/db/m/understanding-hid-light-technology.shtml#get_code ..................................... TERMS OF REPRINT - Publication Rules (Last Updated: May 11, 2006) Our TERMS OF REPRINT are fully enforcable under the terms of: The Digital Millennium Copyright Act http://thomas.loc.gov/cgi-bin/query/z?c105:H.R.2281.ENR: ..................................... *** Digital Reprint Rights *** * If you publish this article in a website/forum/blog, You Must Set All URL's or Mailto Addresses in the body of the article AND in the Author's Resource Box as Hyperlinks (clickable links). * Links must remain in the form that we published them. 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