Quote Originally Posted by hybridlove420
does lighting the bottoms of leaves help? the top is where they convert co2....
I illuminate the undersides of the main branches, which gets plenty of light to all of the areas beneath the canopy...including the side-branching and lower fan leaves. I don't do many SCROG grows, and tend to keep all (or most) of my lower branching, especially if the plant hasn't been trained.

And I'm not entirely sure that the plant can't use the undersides of the leaves to photosynthesize light and C02. As far as I can remember, the whole leaf as well as the stems are where C02 and light are synthesized. It may not have the same luster as the tops of the leaves, but does this make it impossible for light to be useful there? Now I'm curious...