There is a funny tendency of people to put high intensity lights on top of entirely unmanned systems. Microwave relays, solar farms, remote storage facilities, high tension towers, water tanks, and so on. These lights do nothing useful, waste power, but seem to be assumed to be required.
It is really astonishing how far a single high intensity light that is not shielded can contaminate the night sly with pollution. It does not take many such ill-considered light fixtures to contaminate an otherwise pristine dark sky.
This is one area where dark sky ordinances, and recognition of dark sky preserves are important. It helps keep the 'stupid' light.
Additionally this encourages properly shielded light fixtures. We need light to shine down to see things at night, light shining horizontally into our eyes makes things harder to see, and light shining up into the sky does nothing useful. Reflective shielding (or properly design LED lights which are inherently directional) save energy and money. When light is used only for illuminating the ground, something like 90% of it is absorbed.