Correct, my point was, Calman tells the pattern generator it wants 100% red. It sends the same command to the pattern generator (100% red) whether it's measuring Rec.709 or Rec.2020. The difference comes in how the display interprets 100% red, how it measures, and how Calman interprets that measurement. I've used both my Radiance XE and Calman Mobile Forge/Chromecast as pattern generators and they work fine for HDR, I just had to put my RS600 in the right mode manually.Not really, 100% red in rec-709 isn't the same red as 100% red in BT2020. However, you are correct that UHD or HDR patterns are not needed.