I like how you think... Our chickens used to go out at first light, in the winter that was okay. It was more of a chore getting them out at first light in the summertime, getting up so much earlier. This is our second year and they seem to like having a little more time in the house, at least that's what they're getting, and they seem just fine. I know I like it better. We have to close the hen-door at night, as we live in the woods and brushy area that harbors lots of nasty chicken eaters. If we lived in a more open area, I'd leave the hen-door open since they go out into a fully enclosed run. Then after it is fully light and I have had a chance to check the area, I let them out to range freely for most of the day.