Having calibrated both OLED TVs and PJ, they are drastically different when it comes to HDR calibration
I believe the approach for HDR calibration on PJ seem accurate in that the calibrated image should average 40-50 nits and have a peak brightness no more than 100nits
The main issue is not calibrating to a standard brightness. The main issue is some disc /movies are mastered in 4000 nits and some in 1000 nits. This is the main problem
Movies mastered in 1000 nits are less of a problem for most pj. The ones in 4,000 and 10,000 are
When the source plays a material mastered in 4000 nits, we need to use a different profile , calibrated with settings optimised for 4000 nits source material .
On the same movie itself, like blade runner movie, US Disc are mastered at 10,000 nits ! Whilst the UK UHD version is mastered at 4,000 nits ! That’s why this is one helluva challenging movie when it comes to video
They will look drastically different using the same pj, one will appear slightly more washed out , if you apply the calibrated 1,000 nit setting on the PJ for the 4000 nit bluray source from UK. They will look awful
So it’s also important, if the PJ comes with at least 2 picture modes for HDR, if you intend to calibrate the PJ for HDR 1000nits curve and HDR 4000 nits curve