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They will use the same amount of power. A 100 watt bulb will use 100 watts. If a bulb is rated at 100 watts and is specified as a 120 volt bulb, if you apply the 120 volts, it will draw 0.83 amps. Volts times amps equals watts. If you have a bulb rated at 100 watts and is specified as 12 volts, if you apply the 12 volts, it will draw 8.3 amps.

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