I bought a timer at Lowes the other day for use later when extra light is necessary in the coup, I was a little chagrined after I got home to see that it said it would turn on a dusk and then stay on the number of hours I set it for. I guess dusk is what triggers it on. Maybe all the reasonably priced timers are like that. I had been hoping to set the timer to go on a number of hours before sunrise instead. That way the incandescent light would give a little heat the coldest part of the night and, also, I read that it's less upsetting for the chicken to have a light suddenly go on in the am than to have one suddenly go off in the pm. What does yours do? Are there any economical timers that would go on the dark before sunrise, do you know?