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The amount of energy used for Christmas lights is usually written on the box. A 100-bulb strand of mini Christmas lights that are 40 watts, use .04 KWH per day and cost 11 cents a month, if you have them on for only one hour a day. Most people use about 20 strands of lights, and have their lights on for about three hours a day. Your approximate cost for 20 strands of lights during the holiday season is $7 a month.
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