I have a standard outdoor jar light fixture. I use an LED bulb in the summer. For Winter, I took the cover off and put in a 150W heat lamp bulb. The fixture is mounted on the wall above the front door. The coop size is 4x8x 4 high. The closest roost is about 12" away and the nearest bedding is over 2 feet below. For Winter, I put plexiglass over the front door to keep heat in, but left the vents open between the rafters for ventilation. I use the bulb all day until about 2200 each night. They get a break from the light for about 9-10 hours and I turn it on again the next morning when I let them out for the day. I did this with the LED light because I want to keep them laying by extending their daylight hours. I'm thinking about leaving the light on all night for the next couple of nights because temps will be in the teens and is not typical for Texas.