im using (2) sun 4 ft florescents, (1) 4ft natural daylight flourescnt, (1) 4ft cool white flourescent, (2) 2ft natural daylight flourescent and (2) 2ft plant gro flourescents, ive read to mix differnt bulbs to get a wider color spectrum of light, so far so good. i want to add another 4ft fixture but i think it might be to much heat cause right now my closet runs between 80-84 degrees with 45-55 percent humidity, so im thinking right now it might get too hot unless i add a good ventilation duct. but im going to wait prob next time around. im also glad i didnt start these outside the weather has been horrible in mass.