US Patent 9756837 Differential illumination to select egg laying sites

Differential illumination systems and methods selectively provide light having different spectrums in an aviary system for housing animals located within an enclosure, and in the enclosure. A first light source produces light with a first spectrum, and illuminates an internal volume of the aviary system. A second light source produces light with a second spectrum different from the first spectrum, and illuminates the enclosure outside of the aviary system. The first spectrum can have a higher red component than the second spectrum to encourage chicken to lay eggs inside of the aviary system, and the second spectrum can have a higher blue component than the first spectrum to discourage chicken from laying eggs outside of the aviary system.