I have 10 Silkie chicks ranging from 3 weeks to approximately 6 weeks (maybe a few weeks older). I have them in a 2ft by 4ft enclosed brooder with a 250 watt red lamp on them 24-7. I have an opening at one end to allow them to go into the chicken run if the so desire. After a couple of days none have ventured out into the run. I'm wondering if I leave the heat lamp on will the chicks go outside if they get to warm? I have 4 or 5 of the chicks that still seem to small to be without the heat lamp. I am new at raising chicks so any advice you might have would be greatly appreciated.