i run 60 plants in my 4x4 scrog with a 600w hps. running 2 gph drippers in a tray of expanded clay pepples. start the plants in 3 inch rock wool cubes until about 8 inches tall then bury them in the clay pepples. each plat gets its own dripper. water runs usually about 3 times a day for 15 minutes, sometimes 4 depending on the plants needs at the time. recerculating system with dutch master. very happy with results. think i liked the flora nova better though, havent got the dutch master quite right yet.
i have one of these hoods with the crappy seal, wasn't aware they make a high temp silicone. thanks i will be looking for that at the hardware store soon