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The answer is 40 watts, power is a rate of energy. If you are looking for the total amount of energy it uses over its life, take its expected life and multiply it by 40 watts, which will give you your watt-hours.

For example

Expected life of the bulb is 2000 hrs

Then it would be 2000*40 = 80,000 watt - hours or 80 KW-Hours

Power companys charge by the KW hour used

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