my chickies are 5.5 weeks old and very nearly fully feathered (just a few downy wisps here and there) they have been in the outside coop for 2 days with a light bulb on them. I went out to turn on the light tonight and they were all snuggled together in one of the nesting boxes. They seemed to be ok and actually yelled at me when I turned the light on! I live in WA and it gets into the 30s still at night... am I cruel to leave the light off?