It has been in the 80s during the day and about 60-65 at night. They stay in our shed in the brooder box we built for them. My chicks are about 2 1/2 weeks old and have had their heat lamp on constantly. They are all huddled in the shade. I read that you shouldn't turn the lamp off but even as high as I can go they stay mostly in the shade. Is it okay to turn the lamp off? And how long can it stay off for? Thanks!