There is no off peak in my state since electric company deregulation. Set your light schedule to what is most convenient to your schedule and, or, grow environment, (heat, humidity) my friend.ok so im at the hydro store today htg is just a bit away. and he says i should run my lights at night. now im logical in my thinking that the heat from outside,and im in the south, should help mask the heat from inside. am i wrong?