i got a room with 3,000 watts, and a/c which keeps it 75 degrees all day..i grow 6 plants but i split my room into 2. 1 side has the 3,000 watts, one side completely dark. i veg about 6 weeks with the 3,000 until they are about 2 feet tall bush's. i dont top all i do is stretch the branch's down...