Hi,
I did some additional tests. And for some reason however I render a clip out of DaVinci it always clips the luminance at 100% (no LUTs applied). I imported a clip with super-white did no grading to it at all. After rendering and importing back into FCP all values above 100 where cut. And there was no difference between either “Normally scaled legal video” or “Unscaled full range data”. How about that?
Greetings
Ingo