you could run the 1000w but you are gonna need a six inch fan to do so effectively even if you run two sixes i would run a six inch fan so you can bring the lights as close as possible check these pix of a "small" system im runnin right now 600 hps 14 plant aero four inch eco fan 4in carbon filter in a 4x4 homeboxXL hope this helps:rastasmoke: