I love this discussion! It's an excellent debate, is it not? I would love to know all the factors involved. That's funny that you mentioned the reverse respiration oldmac, I'm glad you did, cause I thought the same thing when I read it. I agree with you too italiano, I bet it is different for different strains. which is why I believe the breeders should supply this info. with their strains. Logic would tell you that breeders are breeding their best performing plants in their environment, and I'm sure breeders are just like the rest of us, everybody does things a little differently. And as oldmac pointed out, befree's revelation is nothing more than pure genious! For indoor growers it would make sense to switch the light cycles to take full advantage of the excess Co2 @ night. And last but not least. My fellow Tn brother. Pimp, you too are correct this should be a sticky, and we also need a grow mod. I'm sure the right person will come along or step up to the plate. There's several members here who have the chops. thank you guys for your input, ya'll rock!:thumbsup: