I’ve had a few 519a lights, some domed (Wurkkos TS32), some dedomed accidentally LOL (S21D), some tint mixed (S21F), but bought this last one, a red Hank D4K, because I saw it on Toykeeper’s Favorite Lights list.
I’ve had it for a while now but have been too busy with the Fireflies to measure it and take beamshots. I wish that there were on-board USB-C charging but otherwise, from beautiful 519a 5700k dedomed tint, to easy of handling and quality, to sustained brightness (if a little hot), this light is a home run. I recommend it extremely highly, in particular the version with the Lume X1 Boost driver. It costs some extra $12 but is well worth it.