Another option is to cut them. You should go this route even if you plan to take the whole leaf eventually. Benefits - you get light into the plant and the leaf still adds production. Plus if you end up taking the whole leaf (wait 4 - 7 days) it is less of a shock. When I say cut in half I mean cut off the fingers. I only take whole leaves if / when they yellow significantly. I scrog so light penetration is what it's all about. I often cut off the fingers.