I`m using cfl`s in the hole house and have used cfl for abut 1 year now I do not think there is anything else I can do to cut power cost.....and I do run the grow room at night gust for the fact that the night`s are cooler so my light`s do not heat the grow room or house to 80 or 90 F
(my grow room is 72 F , use 1 20" box fan and a water mister and H is 70-80% ) and I got the KWH TO DAY AND IT`S 0.050 KWH so 1000W x 18H pr day x 0.050 $ kwh = 900 / 1000 = 0.90
so I will cost me 0.90 $ for 1 day of 18 H or 6.30 $ pr week ?
+ water pump + fan