I just got my 4 x 50.2, daytime here in sunny Arizona. Small white room ceiling bounce check looks like very close to 10,500 lumens, as compared side by side with FW21Pro vn, both with 21700 40T and my subjective eyes.
White wall hunting shows both a very nice defined hot spot and also nice, wide usable spill width, too.
The dawn of the new flashlight day is in seven more hours, then I will take it outside for a spin. I am sure I will be happy with its combination of power, beam width and throw.
This light fits in as a EC03 with more power via additional emitter, and as a FW21Pro with more throw from larger diameter reflector and additional emitter.
In a few weeks, I will find out how much another sample can be enhanced with 4 x 90.2. Also, I am guessing that the stock 4 x 50.2 can be boosted to 13,000 lumens.
Don't forget to tighten the tube to head out of the box; and yes, it has normal modes for normal runtime, too. Yay!
Thanks to all who made this single cell 4 x 50.2 config come to happen. I hope it is not to soon to say that this is an important standout light.