In pre-press and photography we're used to ISO 3664:2009[0] which I believe establishes whitepoint brightness level between 80 and 120 cd/m2. It should be added that it requires isolation from daylight and ambient illumination level near 80 lux (and a good monitor)... But even at 150 cd/m2 in a room with controlled amounts of daylight, you should not be blinded by #000 on #fff.

[0] https://www.iso.org/standard/43234.html