OK, so the light itself is for heat, but as my chicks grow when should I start turning off the light at night? Should this be governed by temp alone? I.E. only turning off light at night when night-time indoor temp becomes OK by the 5 degree per week rule. I heard they tend to peck when the lights are on 24 hours, I haven't noticed this being a problem, but I'm probably going to obsess about it anyway so I figured I'd just ask! Thanks to all.