And I’ve already put money away on MK34… But they won’t get them!
I have had bad experiences with Banggood and Gearbest regarding faulty of defective products. You as customer are thrown in the deep end…
Jaxman, please make a 21700 host triple or quad host! If you are worried about the heat, just add thin spring to limit current. It would be up to the user to bypass or replace the spring to increase current. So to modders it will be a favourite 
Ugh. Junkies are just the worst!
Jaxman, I hope you’ll continue to trust your instincts, while still seeking input from your various (potential) customers.
I personally don’t see any point in rushing for a triple tube light, from the perspective of either a consumer, or maker of flashlights.
As a consumer or a manufacturer, the advantage of the 18650 cell is that it is the most ubiquitous LiIon cell type, and with that comes a variety of specific models that strike different tradeoffs between energy density/capacity, power delivery, longevity, and price. It also means that for any combination of traits, the 18650 will generally be equal to or better than other form factors (ie, for a given price and power delivery, 18650 will have greater energy density).
As a consumer or manufacturer, the advantage of any 18650 flashlight is that it takes advantage of the 18650 ecosystem, and, as 18650 cells improve, lights already owned can reap many of the (incremental) benefits.
As a consumer, the advantage of an 18650 tube light is that it is the smallest, most portable form factor flashlight that uses 18650 cells. Indeed, it is small enough to fit into my pockets. It also offers the option of gaining a more compact, portable form factor by giving up some benefits of the 18650 by using an 18350 cell and shorty tube. A 14500 light can be more compact (my EDC is usually an AA/14500 light) still, but, to date, the cells lag 18650 and the best 18630s. A 16300 is, again, more compact, and again, the cells are less capable.
As a consumer, what advantages does a 21700 tube light have over an 18650 tube light? Slightly larger volume. What’s that slightly larger volume good for? Containing slightly more “guts” and therefore slightly better overall capacity and power deliver. It may offer some future-proofing IF 21700s end up being more popular and more advanced than 18650s in the future, but they aren’t now, may never be, and will probably be a long time before that changes. A 21700 tube light will probably be able to sink and dissipate heat somewhat faster than an 18650, but without doing the math, this seems like it will be a minor improvement.
And what do I give up in exchange? At best, 21700 cells are at parity with 18650s in terms of development, but their volumes are lower, and the range of applications, at present, are much smaller, so there is a smaller variety of cells to choose from.
Most importantly though, I think, I give up portability. A 21700 tube light is larger and less portable than an 18650 tube light.
So, as a manufactuer, why should I rush to release a 21700 tube light, rather than waiting to see how the market develops? Well, right now, there isn’t much/any competition, but that could change before one actually gets a light on the market. The size of the market, and its rate of growth is also uncertain. There are, as recent comments here show, some demand, but for the reasons I’ve given above, there is reason to think it may be slow to grow.
Now, as to drivers, I think your current focus on operating within manufacturer specified currents, managing thermals and providing regulated output is a good one, and shouldn’t be abandoned. Offering a hidden “turbo” mode ( whether within emitter specs, or overdriven) with a time out may be a reasonable addition. It doesn’t require an unregulated FET driver, though.
I think selling your hosts is a good way to accommodate the customers who aren’t satisfied with your stock offerings. For the remainder who aren’t willing or able to build their own light, well, they seem like a tiny segment of your market. They may expect you to accommodate their unique needs, but that doesn’t mean you should.
That’s my 2¢, anyway.
(Note, I was/am in favor of the 21700 update to the Sofirn C8F. In that case, the C8-sized head made compactness less of an issue. At the same time, the triple emitters and the substantial thermal path meant that the C8F was capable of high sustained outputs that made the capacity of 18650 cells seem inadequate. I might have preferred a 26650 update, but I think a 21700 was a reasonable choice and a better fit for the look & feel of the light.)
hi, I think I should wait for a long time, until the 21700 battery is very easy to get ,or the 21700 battery is very polular in China, and the world. Then we must fit the battery change to make up flashlights.
Just let the time goes a little……
Thank you for your advice.
hi ,thanks for your long topic, then ,could you find a translator to transfer it into Chinese?
I will find a not busy time to read it and reply you.
@jaxman, he is saying the same thing as you:
Let’s wait until 21700 becomes more common before you make a 21700 flashlight.
I put the most important part at the beginning 
The rest was an argument to anyone who could be bothered to read that it makes no sense to rush to make a 21700 tube light.
Oh, and also support for the idea of adding a timer-limited turbo mode to your regulated drivers.
Well, yeah, but that’s already been said, and ignored (by some). I (tried to) explain why it’s pointless to keep flogging that dead horse.
To be frankly,I did not know well your words.
while,I think I want design some Jaxman flashlights that powered by CR123A batteries for the CR123A fans.
Why does my E2L strobe only sometimes as I cycle the switch?
EDIT:I figured it out, double-pressing activates the strobe function.
Robert
I am still very happy with my E2L with triple nichia 4000K on jaxman DTP board and convoy biscotti driver!
And yes, it does get hot after a couple of minutes.
But it is small, light, convenient and beautiful with the SS bezel.
And no need to mod it with pills and spacers like Convoy S2+
yes,you are very very very right :person_facepalming:
I think I’m going to order one to use as a work light.
Going to put some LH351D’s in there. Curious about it’s performance.
I’m waiting for mtnelectronics to get the warm version back in stock then I’ll have my 3rd Jaxman. You must have a great product if manker is copying it
THIS!
Especially a 26650 version. Please.
Interesting, we see more single 26650 lights like the emisar D4s and haikelite sc26, so if jaxman could make an E2XL with the same structure of the E2L, i would be interested.
That is, if they could use biscotti, bistro or Narsil
But i really like the integrated shelf and smooth stainless steel bezel and the fact it is smaller then other tube lights
Interested in 26650 version too. With 4 leds in series and boost driver. Longer runtime and constant output.
It would have to work with a side switch then. 26650 lights are not comfortable to operate with a tail switch. But I would also like a 26650 version, and even a 21700 tail clicky version too.
hi ,great discover…
Yeah, We set a hidden strobe mode in the light…… That is to say, if you fast click the button 2 times, the light will enter into fast strobe mode….
we have not modify the description in time…
If you have any question pls tell me. This function normally will not influence much during usage, I think.
Best wishes