Copyright © 2019 Apple Inc.

The files in this folder consist of SDR - sRGB patches of varying intensities. 

Internet & Web (sRGB) reference mode has a maximum luminance of 80 nits.

The theoretical (ideal) luminance values are:

10-bit Codeword   cd/m^2	
64                0.0000
108               0.3165
152               0.8075
196               1.5811
240               2.6712
284               4.1067
328               5.9135
372               8.1149
416               10.7322
460               13.7853
504               17.2928
544               20.8906
588               25.3135
632               30.2394
676               35.6832
720               41.6596
764               48.1824
808               55.2652
852               62.9207
896               71.1616
940               80.0000

The ideal CIE 1931 x,y values are the same for all luminance points.

x: 0.3127
y: 0.3290