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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

This sounds amazing, and I can tell you know more about this than me, and I know you are alluding to other issues with rods versus cones ... but are you sure 720nm is outside of the CIE 1931 color model? I would have thought it shows up on the stimulus curve for red en.wikipedia.org/wiki/CIE_193...