DisplayHDR 400 is a certification standard developed by VESA for high dynamic range (HDR) displays. It indicates that a monitor can achieve a peak brightness of 400 nits, which enhances the visibility of bright highlights in images. This standard is designed for entry-level HDR experiences, making it suitable for casual gaming and multimedia consumption. While DisplayHDR 400 provides improved brightness and color accuracy compared to standard displays, it does not support advanced features like local dimming or a wide color gamut. Users can expect better contrast and detail in bright scenes, but it may not deliver the full HDR experience found in higher-tier certifications.