I have 9, 5 week old chicks (looking like 7 pullets and 2 cockrels.) Its been warm inside the house (75-80) so I haven't had the lamp on them for several days. We finished building our coop and the chicks have been trying to get out of the brooder and are very active and loud. I would love to move them out permanently. It is currently in the 60s-70s during the day and 30s-40s at night. The chicks are not fully feathered but are mostly there. They just need some more neck feathers. I would put the lamp on at night for them, would they be ok?