> Are there other switches in the same panel that are lit to the same
> brightness? If you are so inclined, you could always measure the
> resistance of a working bulb in another switch and derive from
> there. V=IR and all that rot.
But don't forget that the resistance changes dramatically when the bulb is
lit (and even varies with how brightly it's lit) ... you really need to
measure voltage & current rather than resistance.
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