I'm FINALLY getting ready to move my 7 week old chicks into the coop. I've read its good to keep the chicks inside the new coop for a few days so they learn to return there at night. I'm concerned though because it's pretty dark inside the coop and I know chickens don't see well in the dark. The coop is 4'x6' with windows on each of the 4' walls, but it's still dark inside. Should I put a light inside while I'm coop training?