My family has chickens and they're a little over 7 months. We have 3 barred Rocks and 3 Rhode Island Reds. Today when I checked their nesting boxes, one of them had a printer paper white egg. I suspect it was from our Chicken Lillith as she seems to own that nesting box so to speak. Is a sudden change from brown to whtite eggs a sign of anything? It's been super cold here, so we've had their light on the past 2 nights, but we bought a red bulb for them for tonight. Will a red bulb still keep them warm but allow our girls to sleep?