Just remember -
Maximum amount of healthy green leaves = maximum amount of energy produced = maximum growth/results.
Besides, why remove them, they are not doing any harm and if the plant did not need them, she would not have grown them in the first place!
The plant knows best how to get maximum results, it is only stupid interferring man that thinks he knows better!
Try and only ever remove yellow leaves, for by the time they are yellow, they have done their job.
This holds true for both autos and photoperiod plants.
Also, the older leaves provide a rich source of "pre-made" vital growth elements that the plant will draw upon during flowering, this is (partly) why the leaves go yellow during flowering. It is more efficient for the plant to re-use the pre made sugars, carbs, amino acids etc from its older leaves, than it is to manufacture these growth elements from new while also growing the flowers. So, not only does leaf removal reduce a plants capacity to produce energy, it also robs her of this vital resource of pre made growth elements she desperately requires during flowering. Basically, leaf removal = smaller buds!
Further, removing healthy green leaves and forcing the plant to grow new healthy green leaves seems stupid and inefficient to me, and no doubt, the plant thinks so the same thing too!
Then again, I am a very "anti-defoliation" person and believe that the plant knows best, so why interfere too much?
I do however believe in a small amount of well considered "lollipopping", just to reduce the amount of insignifigant inner growths.
Hope this helps, Organoman.