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X2 on @ChickensAreSweet and @Michael OShay
Lighting in a coop helps when cleaning a coop, checking for eggs and counting chickens properly. During the cold winter months when the daylight hours drop, adding light can help a hen to continue laying eggs. It’s imperative to have windows in the henhouse as this will strengthen and encourage the hen’s natural response to lay eggs. A 40 or 60-watt bulb positioned 7 feet off the ground produces plenty of light for a 100 square foot coop. For a bigger coop, 60 or 100-watt should be used. In cold climates, a bigger bulb or a heat bulb might be needed. In order to mimic longer hours of daylight, turn on the lights in the morning, evening or both to have a total amount of 15-16 hours of light a day. Amazingly, studies have shown that using red bulbs helps prevent picking, encourages sleep, is soothing to the birds and even helps increase egg production! Pullets need fewer hours than layers, (ten to twelve hours will do) however, exposing pullets to too much heat/light may cause them to mature early.