Cara Smith took a photo of the scene around 6:30 on Friday as she went to work at Copperstate Farms, the state's largest medical marijuana wholesaler.
He lives about two miles west of the farm and says he usually can't see the lights from his home.
"The purple lights are always there, but they don't usually light up the sky this way," he told CNN. "It had snowed that morning and it was still very foggy and cloudy."
Snowflake is located in Navajo County, Arizona, about 175 miles northeast of Phoenix and 50 miles southwest of Petrified Forest National Park.
Some people complained of light pollution, while others said it was cute.
Copperstate Farms has 40 acres of greenhouses – the size of 30 football fields – which use a combination of red and blue lights at night to help its plants grow, according to a company spokesman.
The lights look purple from afar, but normally it's nothing of the sort.
Drops of water in the low mist reflected the light, which made it spread in the sky.
The farm has 70 cannabis strains in production and another 40 in development and has been growing crops since 2017.