Originally Posted by jrref
Also in order to get a very accurate reading, the meter you are using really needs to be profiled against a reference spectro. A while back I played with different "stock" profiles on a C6 compared to the profile I took with my Jeti and with my Klein on an OLED and you can get +- 50 nits or so difference depending on the profile. Also if the set is not calibrated properly and it's vectoring towards blue for example, you will read a higher PL as well. Conversely if its vectoring towards red the PL will be less. This is why if your set is reading anywhere near 650 nits or higher, the set is probably in spec. You will probably have to go through several to get one that's brighter and then it might not have as good of uniformity as the one you have now. The only other option is to exchange it for an E9 where you will probably have a better chance of getting a brighter panel.
The example of 'higher blue or higher red' can provide higher (uncalibrated output by a lot) in not valid.
Its basically the opposite.
If you have more green channel error to your RGB balance, when you will try to reduce that green your peak output will be reduce a lot compared the scenario where you will have more red and or more blue.
REC.2020 Colorspace D65 White Point (x: 0.3127 y: 0.329, 6504K) is using 26.27%, Green 67.80% and Blue 5.93% luminance per each color channel.
So if you have peak output 700 nits White, your:
Red will have 183.9 nits
Green will have 474.6 nits
Blue will have 41.5 nits
So Red and especially Blue are affecting less the peak output.
So if you try to fix a +20% more Y of Blue or Red error, you will have less luminance loss compared to to the luminance loss you will have when you will try to fix a +20 Green Y error.
Also there no spec which say what is the peak output a panel can provide. You can't say to LG that you TV is below any spec, just the average of the TV is 700 nits for that reason LG use that number for the default tone mapping.
For example I know someone with FSI OLED (which is based to WRGB OLED panel) but with totally different electronics and power supply (cost 15K$), which FSI says these panels can output 1000 nits but he is getting 650 nits and obviously are all related from panel-to-panel variations.
LG haven't released any Spec about what is the peak output any 2019 model will have.