I think I tried to help by telling you to get better quailty, smaller fans and use more of them, but then asked for a dimesion of the room and you didn't give that info, just (15) 600 watt HPS lights is all. I would have mentioned those details in the beginning.
What brand of fan is making all the noise?? It's difficult for anyone here to inagine 9000 watts of HPS and such a small fan being used for ventilation. I have more than 250 cfm of air moving through my 8' x 8' room, thats why the comments came out. You didn't give us squat for details and it seems like you don't care to give any details.