That HDR badge hides more than one test. Here is what to check.

HDR labels can look like a single brightness ladder: 400, 600, 1000 and higher. VESA’s DisplayHDR certification does use minimum luminance thresholds, but its criteria also cover colour gamut, bit depth, black level, contrast and other behavior. The tier is a test category, not a guarantee that every scene will look equally bright or that two panels with the same label look identical.

The current criteria distinguish a center-patch test from a full-screen flash test. Those conditions matter because a panel may produce a bright small highlight while limiting brightness across a large white image. VESA also has separate True Black tiers for displays that can produce much darker blacks.

When comparing a monitor, ask what the label’s number means and what other requirements accompany it. A peak figure does not describe sustained brightness, the size of a bright area, black-level behavior, colour accuracy or whether subtitles cause distracting changes in brightness. DisplayHDR 1.2 tightened requirements across several of these areas and added tests for color accuracy, contrast, black levels and subtitle flicker.

VESA’s public criteria show separate minimums for the center patch and full-screen flash. For example, at the 400 tier the center patch minimum is 400 cd/m², while the full-screen flash minimum differs by LCD and True Black category. The label therefore contains more information than a marketing peak, but the tier still compresses a suite of measurements into one name.

Use certification as a screening tool, then look at independent measurements if you need to compare actual panels. Check whether HDR works over the input you plan to use, whether the display’s native resolution and refresh rate remain available, and how it performs in both bright highlights and dark scenes.

Two displays can carry HDR branding while differing in local dimming, contrast, gamut and sustained output. The practical question is not simply “How many nits?” It is whether the screen preserves detail in highlights and shadows at the size and viewing conditions you use.