Dark Skies are not only a problem for astronomers. They also cause problems for migrating birds and insects.
Read about the problem of dark skies from the articles below. If you are installing external lights, pay attention to the fixtures and install the fixtures and wattages compatible with dark skies concepts.
Light Pollution Poses Threat to Migrating Birds, International Dark-Sky Association, May 9, 2019, https://www.darksky.org/light-pollution-poses-threat-to-migrating-birds/#:~:text=Given%20that%20most%20songbirds%20migrate,also%20disorient%20birds%20during%20migration.
National Audubon Society and International Dark-Sky Association Partner to Protect the Night Sky for Birds and People, National Audubon Society, September 11, 2020, https://www.audubon.org/news/national-audubon-society-and-international-dark-sky-association-partner-protect
Kelly, Grace, Insects Do It in the Dark: Glaring Problem of Light Pollution Has Simple Solutions, ecoRI News, June 18, 2020, https://www.ecori.org/pollution-contamination/2020/6/17/night-lights-do-nothing-to-calm-the-beasts
Walker, Connie, A Silent Cry for Dark Skies, National Optical Astronomy Observatory, Astronomical Society of the Pacific, https://astrosociety.org/file_download/af8838b4-7bef-458e-bd9d-883a04da04fe