yeah, this is my first successful (so far) as well.....i read what you write above....yes i know they breathe from beneath the leaves....i lie down looking upwards and breath on them....as for the candles, i use the tea candles as well....place them into large metallic coffee containers to be safe and i put them right underneath the plants, within safe distance so as not to burn any leafs (the buckets are big so as there is no problem)....i have 5 computer fans that work 24/7 blowing on the plants, distributing the air that comes in....the thing is that i forgot to tell you this...it is not good to burn the candle during the dark cycle not because the plants do not use CO2 during the dark cycle but because they consume O2 while the lights are out.....this is part of their metabolic activities....for the lumen thing i am not sure....there is a way to have the candle burning in the room during the dark cycle without causing light poisoning, it's just not useful to do so.....bottom line, only during lights on is CO2 useful.....as for the smell, it is not a problem right now, I am in day 9 of flowering and I believe that I have a good setup....plus I live in the country in a place with no big traffic and lots of pedestrians, so even if it escapes I do not think it will be such a problem (I hope not)....my budget is somehow very limited right now & I can't afford any more expenses at the moment....anyway the candles do just fine at the moment.......you say that you study all the time? I think I will be a professor in home cannabis growing when I reach the level of Harvesting my ladies....LOL

take care man & thanx