Interesting. As I understand it, shifting the red curve to shorter wavelengths, even by a seemingly small amount, would improve visibility. And something I've learned is that red vision varies by a fair amount from person to person.
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Is there vision tests similar to audio tests where they figure out one's individual responses to different wavelengths of light? Super neat.
It would be cool to simulate different people's vision, not just colour-blindness but the more subtle variations.
Unlike consumer audio equipment where you can easily do a frequency sweep to test hearing, you'd need a specialist light source to do the same. Something like a tunable laser. You could probably use a prism to do a similar sweep from a white light source.
This setup is straightforward to adjust to different types of color vision too. They use 3 lights because that's how many opsins normal humans use for color vision. If you're testing di- or tetrachromats you can use 2 or 4 lights respectively, or 12 if you're testing intelligent mantis shrimp.