Yes, yes. I was really thinking you would just compare the
resistance of the known bulb with the resistance of the candidate
bulb. The V=IR part was a not very well thought out
afterthought. Sorry. In any event, I think we're overanalyzing this
whole thing. There are little bulbs out there of appropriate
voltage. Try some and find one that looks like it's the right
brightness. Done.
-Steve
At 04:56 PM 2/25/2008, Pat Horne wrote:
>Steven,
>
>Cold resistance of a bulb is much lower than hot resistance. That's
>why most bulbs burn out when you turn them on.
>
>While it may not have an exact correlation, I just measured the cold
>resistance of a 130V 75W bulb and it measured 21 ohms. That would be
>804 Watts cold filament dissipation. Using Ohms law, the resistance
>of a 130V 75W lamp will be 225 ohms hot, so you might be able to
>measure the resistance of another lamp and multiply the resistance
>by 10 to get hot resistance, but my measurements is just a sample of one. YMMV.
>
>Peace,
>Pat
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