The product comes in full range RGB .exr and HDR formats which are the best for HDR images.
The Exr and HDR formats resolutions:
8192x4096 4096x2048 2048x1024
The HDRI was made using my scene which can be found here:
Previews rendered with Cycles and HDRI strength set to 8.
After purchase you’ll get my full support if needed.
Thank you! Have a nice day! :)