I have found this air stone:
Fish Farm Supply: Aluminum Oxide Airstones
It's a 7" round x 1.5" deep aluminum oxide stone, but it requires 1.5cfm :
Super Luft Pump - 2.9 psi - 22W | Air Pumps | Air Pumps & Supplies | Aquarium - ThatPetPlace.com
Your average fish pump, (10-30 gal) from...
13 bulbs in a 2'x2' setup... is that right, 97 watts??? What's the lumen output? Way less heat signal, and reduced power usage, Nice. Nice price tag too.
"Sticky Situation" Out door odor control? My best suggestion would be to spread the ladies out. Do a "Guerrilla Style" grow... a plant here, a plant there, anywhere someone might not find her. This would eliminate you worrying about smell detection & gettin busted in your garden. Down side is...
I'm a true believer in cfl's. There's no reason to "up" your power bill (In a Small Grow) by using MH. Plus the temps are much lower so closer application to the plants. I've gotten excellent vegetative results with one of these:
200 Watt CFL - 600 W Equal - Full Spectrum 5000K - Spring Lamp...