Fluorescent light cost

What is the cost to run fluorescent lights for seed starting?

By looking at my electric bill, I see that electricity costs about 10 cents per kilowatt hour. Here is the calculation for running two 40 watt bulbs for 90 days (March/April/May).

2 x 40 watt bulb x 14 hours per day X 10 cents /1000 watt-hour = 11.2 cents/day

11.2 cents/day x 90 days = 1008 cents or $10.08 for 90 days

or $3.35 per month per 4' fluorescent light fixture.