Taking in consideration the web environment only, not screen-to-print jobs, let's suppose that we have a font color e.g. #f1ecd6 Hex, displayed by a LCD, properly—by a hardware device—calibrated, using different profiles, applied one by one (e.g. 6500K/2.2 gamma, 5500K/2.2 gamma, 5000K/2.2 gamma or any other value set by our personal preferences in ideal room lighting conditions);
How can we know, that what we physically see, represent the "truly" value displayed on the screen, toggling between the above described profiles? In other words, which is the "right" color, the value displayed @6500K/2.2 gamma, 5500K/2.2 gamma or at 5000K/2.2 gamma in ideal room lighting conditions?
Answer
in ideal room lighting conditions?
"Ideal" is probaby all the lights turned off. So the white then becomes the pure white of your white screen. Another ideal is probably a light and gray walls that match your same white balance on your monitor. Which again depends on your monitor settings.
The question could be "What is an ideal White point", which again is relative, specifically to our Sun. In this page https://en.wikipedia.org/wiki/Color_temperature it says:
"The effective temperature, defined by the total radiative power per square unit, is about 5,780 K.[5] The color temperature of sunlight above the atmosphere is about 5,900 K.[6]"
This middle day sunlight is afected also by the blue cast of the atmosphere, which adds some blue, or some more degrees Kelvin.
But you probably need a more standarized white point:
"Daylight has a spectrum similar to that of a black body with a correlated color temperature of 6,500 K (D65 viewing standard) or 5,500 K (daylight-balanced photographic film standard)."
I would probably vote to use the D65 standard.
"Digital cameras, web graphics, DVDs, etc., are normally designed for a 6,500 K color temperature. The sRGB standard commonly used for images on the Internet stipulates (among other things) a 6,500 K display whitepoint."
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