REPORT ABUSIVE REPLY
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Message Subject
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Do you experience Experience Phenomena with Electronic Devices? Are you a SLIder?
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Poster Handle
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Anonymous Coward |
Post Content
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At the end of life, high-pressure sodium lamps (standard streetlamps) exhibit a phenomenon known as cycling, which is caused by a loss of sodium in the arc. As a result, these lamps can be started at a relatively low voltage, but, as they heat up during operation, the internal gas pressure within the arc tube rises, and more and more voltage is required to maintain the arc discharge. As a lamp gets older, the maintaining voltage for the arc eventually rises to exceed the maximum voltage output by the electrical ballast. As the lamp heats to this point, the arc fails, and the lamp goes out. Eventually, with the arc extinguished, the lamp cools down again, the gas pressure in the arc tube is reduced, and the ballast can once again cause the arc to strike. The effect of this is that the lamp glows for a while and then goes out, typically starting at a pure or bluish white then moving to a red-orange before going out. [ link to en.wikipedia.org (secure)] This happens to everyone because it happens eventually to ALL streetlights. It is NOT a phenomenon, but it is a psychological condition to believe you are causing it. [ link to en.wikipedia.org (secure)]
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