good tread this, i find the 600watt is perfect at 1.5m square, that's how i work out all of my grows in room, shed, size etc, only stick with the 600 watt me my friend, good tread by the way.
hey, i'm El.Knightrider, & i'm looking to learn as much as i can & upgrade my skills for growing, anyone has the time to help me, i'll be a very happy man, thanks.