I've gotten a few questions/comments about "lights on satellites" so time for a quick refresher: satellites reflect sunlight long after sunset, they do not have lights, they are just big and shiny. It's a lot more complicated than "why don't they just turn the lights off?"
Here's a great set of videos put together by @JohnBarentine and the IAU-CPS community engagement hub to learn more about satellites: https://cps.iau.org/community-engagement-hub/satcons-101/