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Anyone know what voltage bulb should be fitted to one of those small Ever ready torches?
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1.5 volt is about right if it's just a single cell.
2.5 volt if it's two cells at 3 volts.
3.5 volt if it's three cells at 4.5 volts.
4.5 volts if it's four cells at 6 volts.
Increase the last three to the terminal voltage of the battery for longer bulb and battery life, but at the expense of the light output.