Bulb life

Posted by David Sherman [72.47.9.228] on Friday, January 28, 2011 at 00:15:46 :

In Reply to: Re: What's the point? posted by gmharris [71.105.178.157] on Thursday, January 27, 2011 at 21:57:15 :

The figure I have always heard is that bulb life is inversely proportional to the 4th power of the voltage. I don't know if that's true or not, but there's definitely a very steep decline in lifetime with higher voltage. If the 4th power rule is true, going from 6.3V to 8.4V (nominal) cuts the lifetime down to about 1/3 of what it would be at 6 volts. Perhaps the compensating factor is that you never get anything like full voltage at the bulb in a 6V truck due to inadequate wiring. I've never tried the 8 volt routine myself, so I'm just assuming it must work okay in a lot of cases because lots of guys do it.

Follow Ups:

• Re: Bulb life - Todd Somers 10:45:52 01/28/2011
• Re: Bulb life - Clint Dixon 07:38:53 01/28/2011
  • Clint....and everyone else. - Jerry in Idaho 10:21:01 01/28/2011
    • Good question, how to keep the 8 v charged... - Doc Dave 18:23:55 01/28/2011
      • Re: Good question, how to keep the 8 v charged... - Kaegi 21:32:33 01/28/2011
        • Re: Good question, how to keep the 8 v charged... - Steve Pellock 15:15:41 01/29/2011
          • Re: Good question, how to keep the 8 v charged... - Kaegi 16:49:23 01/29/2011
    • Jerry....and everyone else. - Clint Dixon 12:25:26 01/28/2011
      • Clint..... - Jerry in Idaho 16:03:30 01/28/2011
    • Re: Clint....and everyone else. - Kaegi 11:58:41 01/28/2011
    • Re: a marked man...... - AAA 10:44:17 01/28/2011
      • Re: a marked man...... - Jerry in Idaho 11:17:25 01/28/2011

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