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What's the point at which you start removing damaged leaves? On the one hand, damaged leaves consume energy while the plant tries to repair them. On the other hand, once part of a leaf is damaged beyond repair the plant may not put any energy into repairing it, and what remains of the leaf will still photosynthesize.
but now what about leaves that have been damaged by nutrient burn, water on the leaves, or bug damage? those almost never let go easily no matter how damaged they are.
the way I see it- there's only so much square footage of light that your bulb can produce, so after you're done training the plant to grow horizontally removing leafs won't increase the amount of light absorbed. once the floor is in complete shade your plant is catching all possible light, so removing a top fan leaf to let the light to bottom leafs won't increase the total amount of energy absorbed by the plant, it'll just redistribute it
In that case I would recommend leaving the leafs on. In this thread i was thinking primarily about leaves damaged from internal sources such as overfeeding, underwatering etc. If it was just your cat giving them a chomp then I'm sure the plant will bounce back