It's based on the materials available to patrons of the East Baton Rouge Parish Library, though anyone can check it out. (In fact, I encourage it.)
Here's the web address - https://ebrpl.libguides.com/lightpollution
(If you're wondering what an InfoGuide is, it's simply an online research guide that describes a particular library system's resources on a specific topic. Here's a link to the ones published by the East Baton Rouge Parish Library - https://ebrpl.libguides.com/)