Hmm… I EDC a D4s, so the added width of a 26650 isn’t a big deal. But I really like the size of my EC65 and I wouldn’t mind more lights in that size.
The other issue is a lot of “tube” lights try to keep the reflector the same size as the battery tube so there isn’t a jarring transition (D1S). A 26650 light would allow a larger reflector resulting in more throw, but once again 21700 lights are slimmer and have I mentioned I really enjoy the size of my EC65?
So… Sofirn SP33?
Tomato-paste can (vs sodypop-can) light that takes a 26650.
All the fancies like a lighted side-switch, battery indicator, etc.
Does a 21700 light really need a new driver?
The 18650 drivers (can be ) fine. If higher turbo is needed take 26650 driver.
For me personally it’s about the extra runtime. Not the extra lumens.
Impossible to answer that question without all details.
I’m always looking for the ideal runtime vs output vs size ratio.
A light with big head I won’t even spend $1 on. (my 26650 light is more compact than many 18650’s)
Runtime is another big deal for me.
While nice lights (looked seriously at the 18650 version) it seems to be geared to much to a turbo monster which is of less intrest for me.
21700 tube with a pocket clip for the D4S…yes, please!
I asked Hank and he doesn’t have any plan for a 21700 cell tube
It would be very easy to make one that threads on the D4S head, though
I don’t like the E07 so I think I’ll stick with my D4S
Would love to see a 21700 tube for the emisar series!! Now I´m thinking firefly, though I´m happy with my 2 D4´s and the D1s…
And topic died…? 
One thng about 21700, they are stronger than 26650 and 18650.
Noctigon K1 uses a 21700 battery.
which 21700 would you recommend for k1
If you have SBT-90.2:
All other emitters:
am i correct in assuming that its because sbt has a high drain? while all other emitters, including osram, are sufficiently handled by 10A discharge? does this make sbt run time less?
and also, it seems sbt advantage is high lumen? but whats the point of high lumen in a dedicated thrower? isnt kcd more important? the osram 2.1 having 650kcd will still have higher beam intensity, aka look brighter, than the sbt, no? sorry im still very new, just gathering pieces of information trying to put them together.
Noctigon K1 with SBT-90.2 can use FET turbo, while other emitters can only use regulated mode up to 5A or 7.5A max current.
SBT-90.2 has a much bigger hotspot, but because it can put out more lumens it also has very good throw. Other emitters have very good throw, but the hotspot is much smaller.
I recommend SBT-90.2 if you can afford it.
ya i see its 50 bucks on top, thats quite deep…i think maybe ill just stick to osram, its meant for pure throwing anyway, dont need a huge hotspot
21700 Emisar lights would make sense!
Great news, flooders or throwers? I still look for something what would keep high lumen flood on bike night rides better than Emisar D4s. Emisar lasts longest time when outside temp ist about 8*C.
The name is Noctigon K9.3, guess how it will be like 
?
This is great news!! Will it use the same battery holder (with charging function) as the K1?
9 emitters in 3 triples?