Originally Posted by
Mitsu3000gt
If Rtings is evaluating these sets in a proper dark room (where every TV can perform at it's best), peak momentary brightness is not as big of a deal, which could be one explanation why it isn't weighted higher. Also the better blacks/dimming on OLEDs can give you a similar contrast differential to the brighter LCD sets even though they have less brightness, but I don't know where that exact crossover point would be. Peak brightness isn't everything for HDR, it's also the differential between the brightest and darkest spots, which can also be accomplished in the reverse, with deeper better blacks on a less bright TV. Gradient performance is very important to good looking HDR, but we talked about that earlier. There also has to be detail in those bright spots, not just a blob of white (unless that is how the film is intended), and you don't want any of that brightness spilling over into the dark pixels beside it or you lose some of the effect, which again which OLEDs can do perfectly, but at a lower overall brightness level.
Depending on the room the way your eyes adjust to the darkness can be a huge part of how you experience it (I had a good article on that I'll post if I can find it). If I recall, the tl;dr of it was if your eyes are adjusted to a darker overall environment, you don't need as much momentary brightness for you perceive something exactly as bright as something that is actually much brighter, but happening in different viewing environment. It's one reason why a movie theater can be blindingly bright at times, even with super shitty/dim projectors. If you have a bunch of ambient light to deal with, then sure you probably want to pay more attention to brightness, but then one could argue you don't need that good of a TV because you will never see it at it's best anyway. There are a lot of factors that go into how good HDR looks, peak brightness is definitely important but IMO it is not the single most important spec. I look at it as more of a balance between all the things that come together to make a really good HDR picture, and certainly there is a significant level of subjectivity involved there too. That is also why people should always buy what looks good to them and not what they think is supposed to look (or sound) good.