i run two thousands at 300 per month.
$20 to $30 max.
It depends on how much you pay for a kilowatt hr. it should be on your electric bill.
STEP ONE - TAKE HOURS USED AND MULTIPLY BY 1000W (12hr a day X 30 days = 360 hours)x1000= 36000
STEP TWO - TAKE THAT NUMBER AND DIVIDE IT BY 1000 TO GET YOUR KWH USED (36000 /1000= 360
STEP THREE - TAKE THAT AND MULTIPLY IT BY COST OF ELECTRICITY.
My cost is 6.8 cents a Kwhr so that would cost me $24.48 per month per light.
360 x 6.8 cent= $24.48
Don't know where the other guy gets his electricity $300.00 dollars for two lights is way out of whack.
peace