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How much energy is wasted by leaving a light on?


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Wiki User
October 02, 2009 9:38AM

Take the wattage of the light times the length of time in hours that the light is left on. Divide this figure by 1000 to get kilowatt hours, multiply that figure by the cost of electricity in your area in cents per kilowatt hour. The final figure will give you the cost of operating the light or wasted electricity if no one benefiting from the light.

For more information see the answer to the Related Question shown below.