Article View: rec.bicycles
Article #94Re: custom lighting systems
From: jeff bell
Date: Fri, 30 Oct 1992 23:32
Date: Fri, 30 Oct 1992 23:32
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davevh@microsoft.com (Dave Van Horn) writes: >Frank Ball writes: >>This is the low beam from a car with four rectangular headlights. >>The light is rated for about 200 hours at 14 volts. >I find that hard to believe.... Keep in mind that it's at 14 volts, not the nominal 12 volts. Empirically, it's been found that bulb life is proportional to the voltage to the 12th power. If you double the voltage, you'll get 1/4000 the lifetime. In this case we're increasing the voltage by a factor of 1.17, so they burn out about 6 times as fast, if this law holds. -- -Jeff Bell "Aleph naught bottles of beer on the wall..." jbell@danger.enet.dec.com
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Path: arc1-ca.pugleaf.net!sparky!uunet!think.com!ames!decwrl!pa.dec.com!sousa.ltn.dec.com!jeff From: jeff@sousa.ltn.dec.com (jeff bell) Newsgroups: rec.bicycles Subject: Re: custom lighting systems Message-ID: <2136@sousa.ltn.dec.com> Date: 30 Oct 92 23:32:45 GMT References: <1992Oct15.005546.19841@microsoft.com> Organization: Digital Equipment Corporation, Littleton, MA Lines: 20