i use 3 150 hps flood lights but i did not separate the balasts. what i did was mount the whole units to a white closet rack and then attatched ratchet straps to the rack for raising and lowering as needed.i posted pics of the setup here once i think.
then i added cfl's from lowes,300 watters/63 watts use at 17 bux each.i daisy chained those on a 12 gauge wire,2 of these with 4 lights on each with 1 plug on the end.these take care of the lower canopy.
but yah i need to stop here lol my light bill is only 35 bux or so a month more and i have a 7'x4' room now.my calculations came out to 55 watts per/sq.but i am now out of room to expand as the closet is now my veg and clone room.