if you have good ventilation and a fan,the 400 will maybe do just as well as the 600,because of the closeness you could put the light,it is all about how much usable lumens your plants recieve not watts.they say that 10,000 lumens is all thats required for optimum buds,but im just experimenting with that now,as well during plant rotation they get even more lumens.So I want to iluminate a 3'x3' room
I have looked at the classical HID lamps but am also interested in LED lighting.
Which would you use?
If i was using HID I was thinking 400w. Does that sound right?