Interesting, i've read in the past that blue lights are used sometimes in places where they want to dissuade people from intravenous drug use because the blue light makes it harder to find a vein. I wonder if that qualifies as fine detail.

That's not at all about fine detail, but is about relative amounts of absorption/reflection of the light between skin vs. vein.

See https://en.wikipedia.org/wiki/Metamerism_(color)

The hospital toilets in Melbourne definitely have that setup. It was weird seeing basically every surface as just a shade of blue and nothing else.

I do wonder - now that most people have a phone with a flashlight - would not the druggies illuminate their own arms with white light and not be too bothered?