12 cents per hour which is the average amount charged by most electric companies per kilowatt hour for my example. This means the cost of electricity to operate a 250 watt bulb in a heat lamp, 24 hours a day, for 30 days is $21.60 (Wiki).Click to see full answer. Beside this, how much does it cost to run a 100 watt heat lamp?So, a 100-watt bulb would only cost $0.84 per hour if electricity cost $8.40 per kWh. In reality, electricity costs somewhere between $0.05 and $0.50 per kWh.Also Know, how much power do heat lights use? 200-250 watts Additionally, how much does a heat lamp cost? In Stock. I bought the Zoo Med Deluxe 8.5in Porcelain Black Clamp Lamp for Reptiles in conjunction with the Zoo Med 60 Watt infrared heating bulb. The heating bulb worked great but the clamp lamp was a bit finicky. Top Selected Products and Reviews. List Price: $12.96 You Save: $3.37 (26%) How much does it cost to run a reptile heat mat?The answer will be how much it costs to run for a day in pence. Eg, if a kWh is 13 pence, with a 12w mat on for 6 hours a day, it will cost roughly 1p a day to run.