I have two sets of chicks. The first are about 5 weeks old and I have them my only spare wire cage with a light in the big coop/rabbit shed. The second set are only about a week old. I have no room out in the coop so I have them in my bedroom in a big wooden box with a low watt bulb(steady 87 degrees). My wife thought they were cute at first, but she wants them to go outside now! At roughly what age can I put the older chicks in their own coop with no brooder lamp? They have most of their feathers and are starting to outgrow the brooder.