Oregons dank, i am using 5 gal. buckets though they look small they are really 5 gallons (I tested it). i am only going to use HPS bulbs for flowering due to the fact they give of more light in the red spectrum (which plants need for flowering). I have a feeling that i wont be using co2 for a couple more grows either but check theese out!
http://www.4hydro.com/growroom/co2boost.asp
http://www.4hydro.com/growroom/co2excellofizz.asp

they are cheap and make perfect sense if you read up on them. could be a possible option for my next grow.

check out my pics of my ventilation and you should get the idea. two tubes are for exhaust and two are for intake. one of each is for my lights and the other intake and exhaust is for my room. i wanted to seal the air flow through my lights because i didnt wnat it to suck the co2, if i were to use it, out of my room while air cooling my lights. my exahuast for my lights is hooked up to a 6" mystery exhaust fan (im borrowing it, so i dont know the name of the maker or cfm's) which works very well and my exhaust for my room is hooked up to a carbon filter which is sucking air out of my room using an 8'" mystery fan. its working well and my temp is between 68F-80F.

Lets flower tomarrow! please tell me if you are up to it and ready.