Anything else, in my opinion, is like selling LTE as “5Ge”.
Also, no, the 400/600 etc is just brightness: HDR10 and HDR 400 are the same, except HDR 400 mentions the level of brightness on the display. [1].
You may be thinking of HDR True Black, which is a further enhancement, but something different. Deeper blacks can also be achieved by non-OLED displays that support full-array local dimming, and it looks like most displays that support FALD are also HDR displays.
[0]https://en.m.wikipedia.org/wiki/High-dynamic-range_video
[1]https://www.bluecinetech.co.uk/hdr10-vs-hdr400/#:~:text=HDR-...
Bit depth is the resolution of the color space.
> Also, no, the 400/600 etc is just brightness: HDR10 and HDR 400 are the same, except HDR 400 mentions the level of brightness on the display. [1].
Vesa [0] disagrees with you. Note the Maximum Black Level Luminance restrictions. Minimum brightness + maximum black level = minimum contrast. That's why legacy display technologies with mediocre static contrast (TN, VA, IPS) need backlight hacks to support those specifications.
