# How much does it cost to light two 100 watt bulbs for five hours a night for 30 days?

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• whatever you pay for 30 kilowatts.

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• That would depend on what your local electric utility company charges for power.

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• 2 bulbs x 100 watts x 5 hours x 30 days = 2 x 100 x 5 x 30 watt-hours.

Which equals to 30000 watt-hours.  Which is 30 KWH.

Where I am, power is 15.2 cents/KWH, so it would cost me \$4.56

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• Electricity costs vary everywhere. What my utility charges per kilowatt hour may not be the same as what is charged anywhere else. You would use one kilowatt hour per day if those are incandescent bulbs. At an average cost of 12 cents per kilowatt hour, it would cost \$3.60.

Energy efficient bulbs would obviously cost less.

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• It depends on what your electric utility charges per kilowatt hour.

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• About \$3.50 - depending where you live. If you used LED equivalent bulbs the cost would be about 35 cents.

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• Anonymous
1 month ago

Depends on power costs.  200 W = 0.2 kW

Multiply 0.2 kW by the number of hours the lights are on.  Multiply by power costs in \$/kWh

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