At 01:14 PM 2/18/02 -0600, you wrote:
>  By "DC thing is pretty
>much a myth"  do you mean you think they'll run as well on DC as on AC?
>I can't imagine why they wouldn't.

DC causes tungsten atoms to migrate in one direction along crystal
defect lines. The result is 'notching' and premature failure. It is more of
a factor in low-current (< 50mA) bulbs.

Here is data from one manufacturer where they claim an average reduction
of 50% in life. But if you put your bridge and MOSFET in there, the lights
will last longer on account of them being dimmer (12th power relationship
with voltage, so a 3.5% change in RMS voltage will have the same effect).

http://www.htl.co.jp/pro/kogata/tokusei_e.html

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
9/11 United we Stand

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