Thanks nocturne for this very informative post.
Re. 219C, here is what Maukka said in his Astrolux S43S (4x219C) review:
With regard to tint, the beam is very even. There’s some artifacts at the edges, which may be because the optic might not sit perfectly on the LEDs. This was the case with the Astrolux S42 as well. It’s not noticeable in actual use though. I haven’t seen this with lights using Carclo optics.
and:
Some modes between the 7135 and FET get a bit greenish in tint, but low modes and turbo are very nice
In his conclusion:
The tint consistent throughout the beam and neutral on most modes. It still doesn’t achieve the rosy beauty of some 219Bs, but can be altered using filters
Re. brightness, I don't think I will ever need the extra 40% over 1200lm, I assume the latter is enough to blind an assailant and impress friends.
Re. beam shape, in fact I like a very smooth transition between the center and the edges, like e.g. on my Zebralight H51Fw. As far as I understand this can be achieved whatever the LED using the 10623 optics or d-c-fix film.