I have the lights on already from 3pm-8pm. My girl's Hens-ly Palace is under a shingled 25x25 roof (no rain or snow after that disasterous halloween snowstorm last year made airplane wreckage out of my just finished enclosure), so I have 2 heat lamps outside the hen house, and 2 more inside. I also have an Eco-heater safe wall radiant panel attached to the underside of the roof in the henhouse. This keeps it warm(er), even though I leave the henhouse doors wide open for air circulation, year round, which in the NY winter can be a challenge. My girls laid right through last winter like crazy, but are now about 18 months old and molting. I have one Cuckoo Marans who laid about 5 eggs this time last year and then nothing for a whole year. Then today a beautiful chocolate egg! I have new 18 week old started girls coming from Murray Mac Murray any minute.