The pink glow you see over Denver is just the Broncos growing grass… Seriously

If you’ve noticed a pink glow in the sky around downtown Denver over the last few months, it hasn’t been the Northern Lights, aliens or some sort of divine sign… It’s just the Denver Broncos growing grass!

According to Denverite.com, “We do have an idea of what this could be!” team spokesperson Megan Boyle wrote. Turns out, the light originates from a new system of powerful LED grow lights. Empower Field groundskeepers use the lights to preserve the stadium’s green grass, especially during the winter months.

“During this time of year, it is common to experience extreme weather, colder temperatures, and weakened sun intensity,” Boyle wrote. “Grow lights (which emanate the light you are seeing) assist in the growth of the grass, keeping a healthy and safe playing surface for the team.”

The light does not come from the towers that illuminate the stadium during games. Instead, these long strips of LEDs are temporarily placed on the field itself, held up a few feet above the turf.

The system is brand new, according to the Denver Gazette. The technology first became popular across European soccer stadiums before coming stateside. It’s just one part of the Broncos’ strategy to maintain a grass field, instead of risking injuries on potentially more hazardous artificial turf.