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Poultry light programs are a popular topic of conversation as a part of managing the poultry house environment. However, if a poll of light programs was conducted, one would find that there are many different variations in the light programs. Features of light such as photoperiod length, light intensity and even spectrum vary a lot among different operations and farms. Light is critical in avian reproduction and is managed closely in pullets, breeders and layer housing. Light is also important in broilers. For example, bird activity is correlated with light intensity. Light management can impact poultry behavior, physiology and performance.