Hi everrrrrrrready, i was wondering how much your light bill went up with that 400 hps light ? DId u buy the cooltube because it was getting too hot or did u just buy it when u bought the bulb and balllast. Also where did u get it and what brand is it. I know it is alot of info im asking, but this will serve me alot, as im going to be growing in a closet similar to your and i will proably be flowering 2to3 plants at a time.