I am using 17 26 watt 2700k cfl's, and 3 26 watt 6500k cfl's for a total of 20 cfl's in a 5ft x 5ft tent with an a/c inside, and an 8" inline exhaust fan with a passive intake. The buds are pretty dense and solid, I don't understand why people get airy buds with cfl's, mine are almost as dense...