Hey gc, can't find a consistent answer to this anywhere. Although I find it fairly intuitive, I've heard many different answers. If I'm running a 120 w centrifuge fan (400cfm) with a fan speed controller (120 v with max 15 amp) at around 50% speed, how many watts is that for the day assuming it's running at the same speed 24/7. Is it simply half the watts of the fan since it's running at half speed? Does it still use all 120 w while only running slower? Or is it somewhere in between assuming the fan router uses some watts? The same question goes for 600w light with a digital light timer. If in 12/12, does the light only use the 600w every hour it is on, and it and the timer use 0w when it's off? Thanks for help with these novice questions!