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Here's the math: 600w/hour = .6kwh .6kwh x 24 hours = 14.4kwh/day 14.4kwh x 7 days (your first week running 24 hours) = 100.8kwh. .6kwh x 18 =10.8 kwh on days running 18/6 10.8 x 23 (number of days in the month on 18/6 cycle) =248.4kwh. 100.8kwh + 248.4 kwh = 349.2kwh for just the 600w lamp...