DH came home and announced that a friend told him we need to light up the coop each day to extend the daylight or the girls won't start laying (they are almost 19 weeks old). He said to add 15 minutes for a few days, then another 15 min, and so on. So what is the best way? I'm guessing a 40W bulb wouldn't add a lot of heat, right? Do you add it in the morning, the evening, or both? How much do you extend the daylight (how many hours total)?