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May7-07, 10:21 PM
P: 2,530
I don't know how big the factor is from cold vs hot on a filament russ. The cold resistance is alot lower than most people think. It is usually assumed (mistakenly) that it is closer to the hot resistance. Measure it with an ohmeter cold and compute it hot (full voltage) and you'll have it.
On the inverter, don't forget to figure in the inefficiencies of the inverter.