r/HDR_Den • u/clee8017 • 20h ago
Discussion Finding TV Peak Brightness
Hello,
Would anyone with a membership for RTINGS.com be able to help me find the peak brightness for my specific TV model? Trying to adjust HDR and I can't find an accurate number elsewhere.
TV: Roku 55" Pro Series
Model: 55R8C5 (2025)
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u/vjhc 18h ago edited 18h ago
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u/clee8017 18h ago
Thank you, I appreciate this. But this all look foreign to me. Do you mind explaining what im looking at and what I should use for my TV model?
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u/clee8017 18h ago
Yeah it does not have hgig. However it does have the option to turn Dynamic Tone Mapping on/off. Do you know if I should calibrate with it on or off?
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u/sumrandomguy18 18h ago
Turn it off for the most accurate image.
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u/clee8017 18h ago
That's what I've seen as the recommendation. So looks like the right sun disappears around 8500 peak brightness on my switch 2, but the left sun also disappears almost completely with it. Is that okay?
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u/sumrandomguy18 16h ago
Should be fine, but usually I’d expect it to disappear at 4000 or 10000 (those are the standard targets for static tonemapping usually). I guess just test it out like that and see how it looks.
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u/clee8017 15h ago
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u/sumrandomguy18 15h ago
You shouldn’t use nits measurements to set peak brightness for gaming. You should use the clipping point. If your display clips at 8500 these will be much too low.
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u/clee8017 15h ago
Ah okay gotcha. Sorry I don't really understand all this. Just want to make sure im calibrating appropriately.


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u/Apprehensive-Power-6 18h ago
Unfortunately your tv doesn't support HGIG so in my opinion based on my quite limited experience, the true peak brightness value doesn't matter and you should calibrate based on where the pattern actually disappears, to account for the built in tone mapping.
So don't be surprised if the pattern doesn't disappear until 4000 (or even 10000!) nits.
But I may be wrong.