Just got my LED lights from Amazon, the 2 lights are 12W Oxyled red/blue. Trying to get picture down below 1 megabyte but having trouble. Anyway the math on cost to run 2 bulbs is 12 watts x 2 = 24 Watts x 16 hours on x 365 days equals 140,160 watts for 1 year of service. Divide the 140,160 by 1 kilowatt(1000watts) that is equal to 140.16 kilowatts and now multiply the 140 kilowatts by your cost per kilowatt ($0.11 for me) and for 1 year of service the 2 led lights will cost to run $15.41. If manufacturer test data is accurate, then the $15 is pretty close.