Help! We're brand new to this "chicken thing" , are very enthusiastic but it seems the more I'm reading, the more I'm getting confused about the light/heat thing. We built a coop, bought some chicks and they just got moved outside to the coop today at 4 weeks old - they're feathered out and were getting too big for the inside set up... have a small insulated chicken coop 4X4X4 and a reflector lamp with 250 watt bulb inside the house itself... am leaving the light on 24/7 for heat.... but am a little confused about how long they will need the light on 24/7? And then after that, how do I know when and at what rate to reduce their light/heat needs?