Holiday chicken coop

Gary put up some ice sickle lights up on the coop today for the hens. They glow down in the back yard! We put a brooder light in the 'run' area to knock off the chill and it has worked really well so far. We've had night it's gotten to 24 degrees outside and stayed at 34 degrees in the roost. The girls are still laying about 3-4 eggs daily. I've wondered if constant light is detrimental but I haven't gotten a definitive answer.