Dr. Barbara Murphy discusses the complex role that light has on horse physiology, especially in reproduction. She highlights the role of blue light in mares reproductive cycle and how it can be used to improve breeding efficiency. The Equilume light mask is discussed and how it can be used to help manage light exposure to benefit breeding. The conversation also touches on light's effects on gestation length, foal development, and horse health, providing practical advice for breeders on optimal light exposure and alternative lighting options.