Not everyone's eyes have the same sensitivity. Some single figure percentage of the population (female? I can't remember) actually have four different receptors. And then there is colour blindness in its many forms, again affecting a similarly sized fraction of the population (almost all male this time). And then there is just natural variation in all of us. The result is that people disagree about when colours are indistinguishable.
Give me a device where I can specify the exact emission spectrum (within the visible band) using perhaps a dozen control points, and I can probably give you a telly that everyone is happy with. I believe the boffins can do some very smart things with tunable LEDs these days so I expect that day will come. But not yet.
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Colour is even harder than that
Not everyone's eyes have the same sensitivity. Some single figure percentage of the population (female? I can't remember) actually have four different receptors. And then there is colour blindness in its many forms, again affecting a similarly sized fraction of the population (almost all male this time). And then there is just natural variation in all of us. The result is that people disagree about when colours are indistinguishable.
Give me a device where I can specify the exact emission spectrum (within the visible band) using perhaps a dozen control points, and I can probably give you a telly that everyone is happy with. I believe the boffins can do some very smart things with tunable LEDs these days so I expect that day will come. But not yet.