I believe light bulb manufacturers have to balance lamp efficiency
(light output/power input) and lamp life. You can get very long lamp life
by operating at a lower temperature (also changing the color). Probably
the simplest way to do this is to use a lamp rated for a higher voltage.
I've seen some broadcast transmitter sites that are using high wattage
230V lamps at 120V. They're kinda red, aren't very bright, but they last
forever.

Harold


On Tue, 6 Mar 2001 09:46:00 -0500 David VanHorn <dvanhorn@CEDAR.NET>
writes:
> >BUT, in those years I've never had to replace a single bulb.
>
> I'm not surprised.
> Bulb life is terribly non-linear, and extremely sensitive to
> voltage.
> If you don't mind everything being orange, you can operate it at a
> low
> voltage where the filament evaporation is greatly reduced.
>
> All the diode is doing, is reducing the filament temperature.
>
> --
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>
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