since i grow scrog style, the light is a fixed distance from the screen so it was no closer when i switched to the cooltube.

c02 changes the whole equation, with co2 you can runn a good deal hotter without problems.

all growspaces are different so what works for 1 might not work for another. that being said, my personal experiences have shown me that if i can keep the temps in the lower 70's rather than 80's my plants grow much much better. doesn't anyone else notice that winter harvests always seem to be much better than summer harvests?