I personally like area lights, they allow me to walk between the house and all my out buildings without a flashlight and I also allows me to see the entire area at night, I'm also able to do stuff outside at night without having to carry around a flashlight, plus the kids like being able to ride their bikes in the driveway after sunset... As said though it's no protection against predators, but it's not all bad... I enjoy being able to look out the house window or step out of the house if there is a disturbance and see both barns and the chicken coop all night...
As for the chickens as long as it's not some arena type lighting that creates a daylight experience they will still return to the coop as the sun sets,..