It takes the human eye over thirty minutes to get fully dark adapted.
ANY white light can make that cycle start all over again.
Use these instead of unfiltered lights, but keep them dim. Bright red lights could ruin someone's astrophotography efforts. No campfires or camping stoves. If you absolutely have to leave at any other time, yell out a warning five minutes before you leave so that astrophotographers have time to save their photos, and others can shield their eyes. Use only your parking lights until you are away from the observing site.