I feared using the lamps so I got the EcoGlow. It's been great that the girls get normal light cycles. They know when it's bed time and are quiet all night! I read some place that chicks that use these types of heaters tend to not use them as long. My girls are 3 weeks old. One day after a short field trip outside they seemed to forget where the heater was after returning. They were very loud even after lights out. When I showed them where the heater was they settled in for the night. For the last week or so they seem to only sleep in front of it. A couple nights later I noticed they all huddled in the furthest corner from the heater but seemed happy and were quiet so I let them be. Wondering if they are just outgrowing the need for it? Next week our weather is "supposed" to get a little warmer and be 40s and 50s at night. That would put them around 4 weeks when the weather gets better. If they continue to not use the heater would I be safe to move them outside? I've read so many things on this............some say 4 weeks, some say 6, and yet others say 8.