From [rec2100-pq](https://github.com/w3c/ColorWeb-CG/blob/hdr_canvas_r2/hdr_html_canvas_element.md#rec2100-pq) > NOTE: {R', G', B'} are in the range [0, 1], i.e. they are not expressed in cd/m2 Suggest to add: The R'G'B' value 1,1,1 corresponds to a luminance of 10,000 cd/m^2