CO2, what can I expect if I buy it in spray-form, and spray my plants with it? I haven't searched RIU forums yet for info, sorry about that, but could you possibly try to summarize the advantage/disadvantages? My grow area is 2,5 x 2,5 x 3 metres. In case that makes any difference, thought I'd tell you.
Let's say you'll do a stealth-grow, like in a maxi-tower desktop PC-case. You do realize, that the amount of light you'll be able to use depends on a) the size of said tower/box and b) the capabilities to get its heat out (the light), and pref. an intake at 50% power of the outgoing fan (or whatever).
Tom