How much electric cost to run LED Grow Lights?

led's can cut you electric bill in relation to running Hid's . HPS. # of light running must take into conmsideration > basicly LED or CFL's are the cheapest running Now if you are talking about yields LED's are a-head of it's class - high yields + cheapest running

If you use the light for 3+ years yes but 3+ years ago you were running burples and where are they now. The technology and efficiency leaps make
it hard for me to justify the initial cost of a top of the line light which will be obsolete in 2-3 years. For me the prices of lights have to come down to 1 euro per watt to make them attractive. I asked my plants if they wanted the top of the line model but they didn't say anything