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I spent the last month obsessed with finding colors that can't be displayed on a conventional screen. This is what I found. moultano.wordpress.com/2026/06/19/w...

fun fact that's not covered: with a bright enough 720nm LED in the dark, you can see beyond CIE 1931. i use a custom-made ~40w Emisar flashlight. it lies outside the rod cells' spectral response curve and only stimulates the cones, which is ordinarily impossible for light

because the rods should ordinarily always be stimulated when the cones are going off, the brain can tell something is viscerally wrong with the light, but the visual sensation (?) of it is impossible to describe accurately

it doesn't affect night vision *at all*, even compared to ordinary red LEDs. it's blindingly bright when swept across the eyes but leaves no afterimages. you can find your way around with it at night and look up and the milky way is just There.

I showed it to an older fella who'd had artificial lenses implanted and he went "WHOA" and covered his eyes and said it was the most insanely bright red light he'd ever seen

But that's true for any red astronomy compatible led flashlight! I love those precisely for this weirdness :) the bw photography rooms of old were also similar a bit, but led is even better!:)