The design and use of lighting in dairy facilities is one way of increasing cow performance, particularly through the use of photoperiod manipulation or long-day lighting (LDL). This practice of designing a lighting system to artificially extend the duration of light that a lactating cow is exposed to require the consideration of both facility specific variables, and luminaire specific variables.
The goal is to supplement lactating cows to experience 16 to 18 hours of light. The cow response and economic analysis of this practice have been studied, at least minimally. This page is set up as a resource for this information on lighting in dairy barns.
Net Present Value Economic Analysis Model for Adoption of Photoperiod Manipulation in Lactating Cow Barns
Roberta L. Crill, John J. Hanchar, Curt A. Gooch, P.E., and Steven T. Richards
Lighting System Considerations and Design Options for Application of Photoperiod Management for Freestall and Tie Stall Barns
Curt A. Gooch, D.C. Ludington