Hey SnS, great work with the L.E.D's, i've been following your logs for awhile... I'm going to be getting a procyron in a few days and i have a small set up like your doing in this thread, except as of right now i have no intake or exhaust, just a few small fans to keep the temp downand air moving... I was thinking that exhaust and intake fans wouldnt be needed if the temp can be controlled, which got me thinking about CO2... do you think that i can get away with no intake/exhaust with the led so long as temp and co2 levels are maintained? Sorry if this is the wrong thread for the question... first post lol