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Date: Sun, 21 Oct 2001 23:36:43 GMT
From: hohnopsamlid.invalid (Goran Larsson)
Subject: Re: Headlamps -- 9-5


In article <B7F73CF3.14576%mgescuronopsam.com>, Marc Escuro <mgescuronopsam.com> wrote: > Now, herežs my thing. I have a 2000 9-5 Aero with 25,500 miles on it. Ižve > never heard of bulbs burning out so fast!!! I mean... Do I have to change > my light bulbs every 1.5 years?!?!?!?! Itžs weird. The lamp manufacturers specifies the lifetime of H7 bulbs (the bulb used in the 9-5 here in Europe) to be about 550 to 600 hours if used at the standard test voltage of 13.2 V. I guess the lamps used in other markets are similar. Normal voltage in a modern car is usually slightly above the 13.3 V test voltage (the voltage regulator is usually set to give 14.4 V or so) and as a 5% increase in voltage reduces the lifetime to 50% it is easy to see that a H7 bulb is not going to last forever, especially with daylight running lights. Some manufacturers produce lamps with higher light output (e.g. +30%) and they only last 250 to 300 hours, or longlife lamps with slightly lower light output but with longer life. -- G–ran Larsson Senior Systems Analyst hoh AT approve DOT se

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