Rob, I am not an electrician but there is a formula to convert wattage into amps. One easy way is "the close enough" method which is 100 watts = 1 amp. So on a 15amp circuit you can burn 1500 watts, and a little more before blowing the circuit. Sorry that this is not real technical, but it close enough to determine how much lighting you can use. David Lorenzen Dallas Tx