I broke down and decided to use a heat lamp (with red bulb) two nites ago (low was 3 degrees F here - SE Ohio). My Brahma's and Brahma crosses (about 5 to 6 months old), who are normally very placid, started World War III as soon as I turned the lamp on (they had settled in for the nite). After watching 2 minutes of screaming, pecking, and shrieking, I decided the lamp was doing absolutely no good other than keeping them warm by fighting and trying to kill each other - so I turned it off. Everyone calmed down, including me, and we all survived the night just fine. I tried the lamp again this morning, a bit before dawn with temperatures at 5 degrees F, just as they were first stirring about and same thing happened. This time I didn't wait for warfare to break out, just turned the lamp off and peace returned. I really don't intend to use heat lamps very often, but we do get some below zero weather here, and I wanted to have something to use just in case. Could the red light be the problem? I know that I can get some clear bulbs, but wondered if anyone else has had this problem with red bulbs? Also considering the radiant flat panel heaters or a heated kennel mat (expensive and I'm not sure how safe they would be in a chicken coop). I didn't mention that for some reason my birds will not roost. They prefer to pile in top of one another, so I use quite a bit of pine shavings. Anyone else have this problem? Thanks for any help, this is my first winter with chickens, so I've got a lot to learn.