Is HDR10+ limited to 4,000 or 5,000 nits?

No. Neither HDR10+ nor HDR10+ ADVANCED is limited to 4,000 nits, 5,000 nits, or any figure below 10,000 nits. Both specifications support the complete PQ (Perceptual Quantizer) brightness range from 0 to 10,000 nits, as defined by SMPTE ST 2084 — the international standard for HDR video. The 4,000-nit figure that appears in some HDR comparisons originated during a period when a widely used HDR reference monitor capable of approximately 4,000 nits of peak brightness was the standard mastering tool at many studios. Content from that era was graded to a 4,000-nit ceiling because that was what the equipment could display — not because any HDR10+ specification required it. That monitor has since been discontinued.

HDR10+ and all major HDR formats that use the PQ transfer function share the same 10,000-nit brightness ceiling — it is a property of the shared standard, not of any individual format. When a comparison claims one HDR format supports 10,000 nits and another supports only 4,000, it is describing a historical difference in mastering practice, not a difference in what the specifications permit. HDR10+ content has already been mastered to the full 10,000-nit range. The Spears & Munsil Ultra HD HDR Benchmark (2023 Edition) — a professional 4K Blu-ray test disc used by display manufacturers, calibrators, and AV reviewers worldwide — encodes content mastered at 10,000 nits in HDR10+ alongside HDR10 and other formats. It is commercially available and has been reviewed by Sound & Vision, AVForums, and TechRadar, among others.

Most professional HDR content today is mastered to 1,000 nits, matching the peak capability of current premium consumer displays. The brightness a viewer experiences is determined by their display’s panel capability — not the HDR format. A television with 1,000 nits of peak brightness shows all HDR formats at the same maximum brightness. What HDR10+’s dynamic metadata does is ensure your display uses its full brightness capability intelligently: optimizing tone mapping for each scene rather than applying a single fixed setting to the entire program, so every scene looks its best on whatever display you have.