i want to vertically hang a 600 watt bulb and put my ladies around the bulb. will i need a ballast system??? help
already answered this in your thread directly under this one?"!?!? also i beleive HPS lights emit lumens more efficiently from a horizontal position! delete that other thread man!!!
if you like you could use a normal HPS, and then hang a cfl in the middle of ya plants, might work well!