sorry about the burns, hope it wasnt too bad. and i cant really answer your question about yellowing, since i havent gotten that far in my own grow yet. but your plants still look good, i wouldnt complain about having a couple like that. im almost finished with my new grow cabinet. pretty excited...wiring it up now. its going to have 14 light sockets and 1 18" fluorescent. 12 sockets are in the bottom portion, some of them have splitters for more bulbs. 2 sockets are in the top, along with the 18" fluorescent. i hope i wont need more light lol.