sRGB is quite literally defined as "the average 90s CRT in an office environment", i.e. full-white sRGB on a HDR display should be around 100 nits or so in thos

sRGB is quite literally defined as "the average 90s CRT in an office environment", i.e. full-white sRGB on a HDR display should be around 100 nits or so in those reference conditions (i.e. display set to "reasonable" brightness).