system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do they use red lights inside certain rooms in boats?

I often see this in films and documentaries like inside a control room in war films. I often wonder why they don't just use a regular light?
gpt
Red lights at night save your night vision. If you turn on a regular light, it can take an extended period of time for your eyes to refocus when you shut it off. That’s not the case when using red lighting.