Form factor looks good.
I like the smooth transition from body to head, a design unique to rofis until now. Hoping for 21700 single emitter or quad with throwy optic.
Same ! I’m hoping for either a 18650 or 21700 with a W1 emitter…. but then again I probably should slow down on lights already eating into next years budget….
Single emitter with SBT90.2?
Finally 21700 in the compact, sorry the button is not in place but in the ass … 
Same here. This light is grossly overbuilt which is OK in general but not what I’m looking for.
Single cell with 3*SBT90.2, trendy 250W output, ultra low body weight at 25grams, reviewers then complain of direct drive circuitry not being efficient at
1W output and heating up too much at 250W output. 
Looks awesome, Hank!! Stoked for details.
Do you have a timeline for when the Nichia E21A will be available in the KR4?
I hope it’s an 8 or 9 emitter 21700. I don’t like how after the fins it’s completely smooth. IMO it looks a bit too plain. Maybe make it more aggressive like the K1.
KR1 was made complement the KR4, it is 18650.
Head diameter 35mm, length, 110mm.
W1 110Kcd, W2 100Kcd. XP-L HI 45Kcd
Due to this year’s complicated situation this has been slowed down a lot.
Awesome! Thanks, Hank! Any timeframe on the Nichia E21A? And will a range of temps be offered for that emitter?
The E21A LED should be available by June.
That looks really great, Hank.
18650? 
SBT90.2 mule on KR1? 
Yeah, 3*SBT90.2
Now we need a K1 mini (D1s replacement).
The 18350 variant is very cute.
Why do you want to use SBT90.2 as a mule? It’s amazing as a thrower but if you want a mule, rather it be the much cheaper and more efficient XHP50.2