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?