it depends on whether you have a reflector or not and what ur doing with the bulb. no reflector go vert and drop it low near plants. if u got the reflector hang them horizontalAll beautiful grows guys, but was just wondering which way is best to hang lights,horizontal or vertical, or does it make any difference?
i don't know how i missed this thread. im gonna have to read the whole thing, so far just the first and last pages. are we talking about whole runs or individual plants? my cab is like 1.5sqft exactly and i use 70w right now. im in the middle of a staggered run now so i will post up some pics and stuff later.