I agree with all above - 21 mm toooo wide for AAA light.
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I think this body shape would be nice as a 14500 twisty. 21mm would be okay for 14500.
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I think that is too wide for AAA, but it could work well for an AA light.
For AAA I think you should try to make it 15mm wide at most.
I don’t know how popular an AAA mule could be, I don’t think it has been made before.
I think a longer size would be fine, in exchange for a small reflector/TIR. Most people interested in AAA do it for the narrow size, not caring as much for the length. I think a length of around 75-90mm would be ideal, if using a mechanical switch. Shorter if using twist mechanism.
I quite like that ,one thing my keychain aaa’s don’t have is throw, So a bigger head like that with a reflector and maybe NM1 would be good.
In Raw aluminium or Stainless steel so keys don’t scratch it up, 10440 capable.
A smaller ,simpler (hopefully cheaper) GT nano.
Personally, I would love to see a AAA/10440 tube style light with an OSRAM to punch out to 25 meters. It seems like all of my options for AAA/10440 is either the Lumintop bigger head with pencil beam out to 100 meters, or an ultra floody flashlight good for under 10 meters. There’s hardly anything in between.
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A design similar to an older stainless steel Thrunite TiS (mod with warm white XP-G2) would be perfect. I still wear this lamp with a suit for lack of a worthy successor because it is simply inconspicuous and looks classy. It does not have this tactical look some other lights have and it is also very small.
I don’t like such a playful knurling, especially with such a compact lamp. As simple as possible, with a few edges at the top and bottom, and with an optional clip, perhaps even - if possible - without a knurling. I find this design somehow disproportionate, it doesn’t really fit together.
And for me a keychain light does not need throw. It should be just a flooder because usually I need light in my near area (finding keyholes, looking in basement, guiding my way to the car), not far in the distance. If I want this I would grab a pocket thrower.
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Wow! I just looked it up, and that is one nice looking light. Reminds me of the Tool AA somewhat.
I agree 100% with you, that would be very nice. It could be designed to look similar to the S2+ or S6, with the simple diamond knurling.
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FYI, if you can source a Jetbeam Jet-u, it can run on 10440. The TIR is decently throwy, it would probably work well with a W1, I stuck a 219b in mine, with 1.6kcd on high with a 10440.
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Yes, but the AA is much more bulky in comparison to the TiS, also the TiS is a simple 3-mode twisty, which is imho just perfect as keychain light.
For me, this is the real deal here - it is really small and inconspicuous.
Alternatively, the TiS also fits in any pocket.
@Simon_Mao it would be really cool if you could make such a lamp a spiritual successor to the TiS. Of course existing drivers wouldn’t fit here, it would require a small driver (driver PCB diameter of TiS around 11 mm), but I hope that wouldn’t stop you from developing such a lamp…
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It’s similar shape to the Maratac AAA light. Wasn’t there a twisty that reylight produced years back which was also similar? I’ve been holding off the lumintop AA/aaa offerings for various reasons…
As far as I know Maratac lights are manufactured by Lumintop, according to CountyComm cosmetic specs.
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I’m planning on trying to swap emitters on a SL Macrostream. If that goes well, I’ll try it with a Microstream. Although they are pretty floody, I’m hoping to maybe double the throw, but it will be awhile.
I was hoping it would be a tailclicky flashlight 
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Would be very difficult to create a reliable keychain light (where size is absoutely crucial, nobody likes a brick on their key ring) with a tailclicky. Maybe some sort of e-tailswitch might be an option here, but only with twisty UI it is possible to create short and small key chain lights. Even a side switch makes the light bigger since the driver has to be bigger (in height) because of the switch. A robust attachment for a ring on the tail would also be difficult to implement. Not to mention the price, which is another issue.
I guess with the zebralight-method one could make a sideswitch light that is not longer (driver around the LED, button basically “hidden by the reflector”), but doing that in such a small formfactor sounds borderline impossible. At least with reasonable R&D costs.
For such a key ring light it’s actually a contradiction in terms: a key ring light has to be as compact as possible, has to withstand everyday use with keys in your trousers (this is where sideswitches with rubber caps are likely to fail at some point, say hello to the Ultratac K18), shouldn’t look completely unsightly after just a few weeks and, above all, has to be cheap. Nobody will want to spend 200 dollars on a key ring light. And this can basically only be achieved with a Twisty. The advantage is that the driver can be kept very small, no switch can break, and the whole thing can be built very cheaply.
Thrunite has built the Ti3 for precisely this reason: it is very compact and can be built very cheaply. The problem with the unsightly appearance could be solved with a stainless steel version, which Thrunite also offered with the TiS at the time.
And I also wonder whether Zebralight has a patent or something on their design, after all, to my knowledge, no one else has yet built anything like it.
LF2XT was a successful example that this was possible, way back in… 2012?
edit:2009! Originally sold for $65, nowadays that would be c.$95, still a premium light but proof small + tail clicky possible. I’m not saying this is what Simon should build, just that it’s possible.
Personally, I’m a fan of compact twisty AAA lights, the ITP i3 (since became Olight isomething) was an absolutely brilliant little light, I think I still have it somewhere, still rocking the c.6000K XPG-R5 
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I have the 11mm driver circuit, but it doesn’t support the 10440 Li-ion battery.
I want to extend the diameter to 13mm.
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13 mm to get compatibility with 10440? This could be good in terms of good design and proportions.
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