Colorimetry is hard. The mapping depends on way too many factors (e.g. what light you use), even if you assume sRGB on the RGB side. An unqualified RGB tuple is almost meaningless.
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…but the ratio depends on the display, e.g. some displays have white subpixels.
DIsplay technology is irrelevant. The definition of the sRGB colorspace doesn't care how you implement it. White subpixels are a hack to get better brightness at the expense of color purity, and never help you if you're trying to cover the sRGB gamut.
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I posit that any display using white subpixels and assuming subpixel independence (no weird global power limitations/interactions or whatever) that covers the sRGB gamut can also cover the sRGB gamut at identical brightness with the white subpixels always off.
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ok, even though my previous statement was wrong, *that* isn’t necessarily true, since even the purest blue available is close to pure 470nm light, which is well within the range where M and L are significantly activated in addition to S; therefore…
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