I have my 600w in a cool hood i can put it as close to the plants as i like, I can even touch the glass with my hand and leave it there for like 10 mins. I keep it about 6-8 inches from the tops
Yeh its huge lol, I just revived my cool hood yesterday and got that set up, Ive just transplanted the LSD and Fruity Chronic juice into 20L pots and they both are now on 12/12. Ill post some pics later on today.