Hey not quite sure what you were saying there dude. Anyways, I'm assuming that you mean your problem is that the lower leaves on the plant are turning yellow. This is because the upper leaves are blocking the light that can get to that part of the plant, so the leaves die. Nothing to worry about as long as the upper part is healthy. In fact, I pull off the lower yellow leaves on my plant as soon as I see them.

This doesn't happen in nature because sunlight is much brighter than anything one can muster in his closet lol