Thanks Mike, received the K2 KIT today and i must say im impressed!
Heres a mini review as promise, sorry no equipment for detailed testing
excellent fit and finish, nice HA3 match, just very slightly darker on tail. It has a very bright defined hotspot with bright corona(see photo) and good spill, pure white as expected of WO tint. Output is impressive, more than i expected. Comparing it to my Arc 4+ UWOK, its slightly dimmer than level2, which equals to about 55lumens. Very bright for something as big as your thumb!
Also the luxeon K2 have lower slugs, similar to the joker lux3s, so Mike had to adjust the reflector to optimise focus.
These K2 luxeons are Bright! my one is underdriven, imagine how bright it would be driven at spec!
Arc4+ UWOK Level2 v. KIT k2 UWOJ