Relaying your headlights vs. headlight life

[mike]

It was a long time ago but I seem to remember that a
10% drop in voltage equals a doubling of lamp life 


--- William Magliocco <magliocc at rocketmail.com> wrote:

> Just a thought...
> 
> When you give your headlights a nice, potent source
> of
> DC power, they will draw more current, etc. than
> through the Audi OE wiring.
> 
> One of the minor drawbacks is reduced filament life.
>  
> 
> I work with vacuum tubes in large UHF TV
> transmitters.
>  These run $30,000 to $60,000 each.  We are taught
> to
> run the filaments as low of a voltage as practical
> to
> get the desired operation on the tube.  Filament
> voltages above what are necessary shorten tube life,
> end of story.  There is a term for this called
> "filament management".
> 
> In an automotive application, of course, we want
> nice
> bright headlights...
> 
> Bill M.
> Atlanta
> 
> 
>        
>
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