But, did you know that they also help cows produce more milk?
Cows exposed to 16-18 hours of light for a year produced 8 percent more milk, according to the 2015 Michigan State University research study.
While researchers had known for three decades that cows could benefit from long-day lighting, farmers were never able to establish the correct lighting conditions.
Enter LED lights into the equation.
Researchers equipped Wings Acres Dairy — a 100-cow dairy in Barry County, Michigan — with new LED lights, sensors, and an automated control system. The new setup did the trick, exposing cows to the optimal amount of light for 66%-75% of the day.
Researchers ruled out two other potential factors for the increase — farm operational practices and weather conditions — and concluded that the LED lighting did in fact lead to more milk.
In addition, farmers estimated a 50 percent reduction in lighting expenses and predicted that the LED lights would pay for themselves within a year.
“Anecdotally, the dairy farmer has noticed that cows in his milking herd have become more docile and less agitated,” the researchers added.