I stepped up today.

Got a digital/switchable ballast, 400mh/400hps, cool tube setup now

How far should the MH be from the plants? Seems to not cover all the leaves at the edges as well, when i get it close.

I ran outta money, so I modified a $40 Stanley fan for the exhaust. It is working quite well, and when I get a carbon filter in there, it should be even more quiet.

I have a few layers of activated carbon filter material, installed at the exit grill for now. It works. Of course, I plan to have my complete filtering system in place before I flower.

Going to try to find a way to lay my screen tomorrow, so I can start ScrOG training.

Thanks for the tips and comments. I appreciate them all.