i have more room than i need, i only have the one light and it seems if they aren't under the lamp shade they dont get as much light as the ones in the middle. I do try and rotate them around but that can be difficult to as there are two main sizes among them, about 11 are larger and bushy and the other 7 or so are very solid compact plants (too many?). I have them in a corner that is painted white with two reflective panels i can move arond to make up the other two walls. I have a fan running to move the air around a bit (room too big to heat up much). No real flowering room and only a mh light. I have the light quite close to the top of plants (about ten inches) If i raised it up a bit i think i would get a wider area but would that slow down growth?. Lol, Sorry had a BIG fat J b4 and just realised i'm just rambling a bit. Cheers.