we use 1.2m+2.4m bud tents, in the small one we use 2 600 super novas,intake 5" out going 6" r.v.k fans,and a air conditioning unit,in the big one there is 3 600s and 6" intake and 8" out going r.v.k. fans and a airconditioning unit witch is also a de/hum machine,we do s.o.g with 100 clones in the 1.2m and 200 clones in the 2.4m one:thumbsup: