Thanks, that would make sense if I assume 1990 is some well-known baseline date for Apple serials.
By the way, as promised I just measured my A018 screen with the default color profile using Calman and an i1Pro spectro. In the graphs below the 100 value on the horizontal axis corresponds to max brightness and every step lower corresponds to one step lowered brightness, so 100 = 16 max brightness, 90 = 15, going down to 0 = 6 brightness.
RGB balance
0----------------------------------------------------------------------------------------------------100
What can be seen is that the color temperature slowly shifts to more blue when the brightness goes up. All colors are between 99 and 102% over the entire range, which is excellent and results in a very low Delta-E76:
Delta-E76
The green line corresponds to a Delta-E76 of 3 which is generally considered the visible threshold. (Side note: the yellow line means good performance, anything above the red line is seen as poor)
Color temperature
Color temperature is between 6500 and 6640 over the measured range. 6503K corresponds to daylight whitepoint (D65). Going down on the temperature scale below 6500 means a warmer color (red/yellow), going higher means colder (blue/cyan). Lots of PC screens are 8000-ish or higher so this is a really great result.
So this screen is by no means "yellow".
I also like the gamma of the screen, so there is no need for a custom color profile here!
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