My chickens needed a night light to get off the roost and find the nest box in January and February. I used two led battery operated low light stairway lights. Photo sencer on/off. Lasted almost four months by then it was a non issue.
If I put a light on the outside, it would be a motion sencer light to tell me to look for the bandit trying to get my chickens. My night checks I do with a flash light.