Not sure if this has been done or not but here it goes. Over the winter months I had to close all the windows in my coop to help keep my girls warm at night. The only problem was that it was to dark inside when they went to roost. They would end up roosting on the floor, in there nesting boxes, on top of the feeder just about anywhere they could. I didn't have any power in my coop, and really didn't want to add any more lighting that I had to. So I came up with the ideal to make me chicken night light using Solar power. And make it as reliable and cost effective as possible. And this is what I didn't.
Took one of those 99¢ solar lights you find at Walmart.
Removed the top, and unscrewed the cover exposing the wiring.
Cut me about a foot long piece of wire(I used a old phone charger wire. Then CAREFULLY cutting and stripping back the red and yellow wiring to solar panel
Then added my extension to light end.
Then I installed my light inside my coop, ran wires outside, attached my solar panels and place panel on top of coop.
Now I have just enough light to enable the girls to get up on there roost, yet not to much that it'll change there laying habits.