well the watts are changing all the time for my needs some times i will run 10 42 watt bulbs at 2700 kelvin mixed with 4-6 26 watt 6500 kelvin it depemds on the strains that i have at the time and how maney i have under the light that light can go as little as 260 watts to as high as 840 watts it is very customizable that is why i like it so much i think i should correct this post in saying those figures above is where i keep the light set up at bu i am sure you if you do oams law you can see that on a normal 115 vac outlet you could have a safe total of 1400 watts at 12.173 amps and and if you were getting 75 lumens per watt it would total 105,00 lumens .