I put up a plain white rope light in the run about mid-November. It gets kind of dreary and gloomy in the winter here. I don't want my chickens to get depressed. Maybe this year, I'll get some colored ones too...?in the winter i string up lights on the run.
The light is only on when they're out and about. It's not to try to make them lay later into the winter months.
In the fall, I rake up lots of leaves and dump them in the run. They love to scratch through those!