area is fine. trim off any lower growth that doesn't get light. that's wasted energy. that energy can be redirected to the tops where you will get bigger buds there. it also looks like its a little too hot in there. whats your temp/humidity? maybe cut back on the nutes it looks like nute burn too.
I think the light is reaching the bottom of the plants!
Hey man why you got more tinfoil up in there!!! Just white paint would be better, seriously tin foil has no place in a grow room, 50cents of white paint is easily better and no hotspots! Grrrr tinfoil, it sh!t man.
Lol the plant burn, flush then reaply 1/4 strength. Maybe a flush could be hard here but best advice.
People think that tin foil reflects a lot of light and evenly, well it don't, rip it out dude and just paint the walls white.