Just saw this on the Nitecore website
4000 lm and battery smaller than TUP? 1000 mAh vs 1200 mAh… 
Nitecore says “The world’s smallest 4,000 lumen flashlight”
Shove a 18350 into the D4V2 and BOOM you have a smaller flashlight that does 4,000 lumens with more capacity!
That is tasty - so is a D4V2 though 
If I had both in front of me, I don’t know which I’d pick. I do rather like this more modern take on a quad…… I have more than my fair share of quads, but all round with no oled display (I know it’s just a toy lol)
On the flip side, I don’t have any with aux lights - I love the look, not so sure if I’d want it on my bedside cabinet that bright though - gitd does a grand job.
Interesting. I’d take D4/KR4 shorty over this 365 days a year, though.