So with the more advanced FALD implementations we've seen the last couple of years (Vizio P, Samsung KS9800, Sony Z9D) and even the surprisingly good edge-lit designs (Sony X930D, X930E, Samsung Q9F) is it still recommended to use Full Field patterns with dimming off for measurements or is it optimal to leave LD on and use something like Constant APL 18 or APL 25 patterns? Or even 10-18% standard windows? This would be for BT. 1886 targeting.
For example, with my 2015 Vizio M, if I calibrate with LD off and then turn back on for normal viewing, my gamma readings obviously go wonky, but more disturbingly, my xy values @ 40 % grey and below shift dramatically (from 0.5 dE to just over 3 dE). CMS/Saturation sweeps also gain quite a bit of error. Visually, I don't see any obvious tints in shadows, but with the numbers jumping that much I question the dimming-off method.