Research References:

Gongruttananun, N. "Influence of red light on reproductive performance, eggshell ultrastructure, and eye morphology in Thai-native hens." Poultry science 90.12 (2011): 2855-2863.
Huber-Eicher, B., A. Suter, and P. Spring-Stähli. "Effects of colored light-emitting diode illumination on behavior and performance of laying hens." Poultry science 92.4 (2013): 869-873.
Rozenboim, I., E. Zilberman, and G. Gvaryahu. "New monochromatic light source for laying hens." Poultry science 77.11 (1998): 1695-1698.
Siopes, T. D., and W. O. Wilson. "Participation of the eyes in the photostimulation of chickens." Poultry science 59.5 (1980): 1122-1125.
Nuboer, J. F. W., M. A. J. M. Coemans, and J. J. Vos. "Artificial lighting in poultry houses: do hens perceive the modulation of fluorescent lamps as flicker?." British poultry science 33.1 (1992): 123-133z