The numbers worth remembering
| Reference point | Brightness |
|---|---|
| SDR reference white (BT.709) | 100 nits |
| Typical HDR mastering display | 1,000 or 4,000 nits |
| Consumer HDR TV peak, common range | 400 to 2,000 nits |
| PQ curve maximum | 10,000 nits |
The PQ curve's 10,000-nit ceiling is headroom for the future, not a target. No consumer display comes close, and content mastered above 4,000 nits is rare.
Peak versus sustained
A display's advertised peak brightness is usually measured on a small window, often 10% of the screen area, held briefly. The same panel driven at full screen may deliver a fraction of that. This is why MaxFALL, the frame-average figure, exists alongside MaxCLL: a display needs to know both the brightest pixel and how much of the frame is bright, because sustaining a bright full-screen image is a thermal problem, not an optical one.
What "ten times the headroom" means
The common claim that HDR gives ten times the range comes from comparing SDR's 100-nit reference white to a 1,000-nit mastering target. It is a fair description of the encoding, not a promise about your display. What you actually see depends on the panel, and a 500-nit monitor showing a 1,000-nit master is tone-mapping every highlight above its ceiling.
Questions people ask
How many nits do I need for HDR to be worth it?
Roughly 400 sustained is where the difference starts being visible, and 600 to 1,000 is where it becomes obvious. Below about 350 a display accepts an HDR signal and then tone-maps it into a range that cannot show the headroom, which is why cheap HDR monitors disappoint.
Is a brighter display always better?
For highlights yes, up to a point, but peak brightness alone is misleading. A panel's advertised figure is usually measured on a small window held briefly; full-screen sustained output is often a fraction of it. Black level matters as much, which is why OLED at 800 nits can outperform LCD at 1,500.
Related: the numbers behind the headroom.