>I was using my shack's 13 volt dc line, but I've found when
>I ran the bulbs from the dc supply the life was shorter.
I have experienced the same thing with conventional incandescent pilot
lamps. Running them on DC seems to lead to a very short life.
Someone once explained the reason, but I forget why. It is some kind of
"effect" with a proper name attached, and I recall it having something to do
with the molecular structure of the filament forming segmented rings on the
surface of the wire. It's been so long since I read the document that I
don't have a clue where to look to find it again.
Don k4kyv
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