4K and HDR are different standards, but they both deliver a quality image for projector image. 4K HDR means that your projector supports both two standards.
Some projector beginners want to know that what kind of HDMI Cable is compatible with 4K HDR. This article will give a list.
HDMI 2.0 a/b with High-Speed Certification Standard is certified for 4K HDR at 60 fps for great transmission quality.
HDMI with Premium High-Speed Certification Standard has stricter testing for 4K HDR at 60 fps and expanded color feature, which is the best choice.
Please note that HDMI Pre 1.4 is not compatible with 4K or HDR signals.