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Without even looking at your math I can tell you that a 36 watt bulb left on 24/7 would not raise your electric bill that much. Two things (at least) could have happened: you have a program where you pay about the same every month for electricity, the average monthly use, but at the end of the year they make you catch up by putting all of the amount not yet paid on the one bill (this happened to me). Or, you have at least some of your heat from an electric heater, and the cold weather made it work hard. A 1500 watt heater can quickly drive up the bill.
 
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