That would be better - it would lose more heat. But I like my one the way it is...
It would be a pretty easy light to mod.
Wow that’s weird Mine has the longer threads like the bryinte on the right … It is 6 full turns before it drops off the threads … The head side does look a little bit shorter threads and went 5 turns before it fell off the threads . Wonder if your tube is just flipped around?? …I do like my bezel ground down smooth it looks and feels much better …My biggest complaint with this light (xp-g version )Is the body,specificly the center tube The flat spots on the body makes it slicker for no reason ,just so they have a place to advertise .What I want is just all knurling . This is the same reason I’m afraid to buy the D-11 Nitecore …Silly flatspots
Send me your bezels ..
Boazs' Yezl bezel grinding services
lol...thank you Dr. Seuss!
No, it isn’t flipped, it is a different body. Even the lanyard holes are ultra thin on Yezl. I suspect different batches or even built by different factories with the “same”(!) specs…
I received my AW 2900mAh protected li-ion and 1600mAh IMR cells yesterday. With a full charge, the protected li-ion puts out the rated 2.5A but the IMR does a full 3.5A on high. I noticed that there is almost no difference in brightness from 2.5 to 3.5 amps. After doing some reading of Crees product sheets, I see that the XM-L is rated at a maximum current of 3A. It doesn't say what happens when you go beyond that.
One thing I did notice, the head of the light would get absurdly hot in seconds but with the protected cell at the right current, it was a bearable amount of heat.
Am I turning my light into a heater with the IMR cell with no increase in light output?
Yep. You practically have to solder the XML directly to a giant block of copper and cool it with a fan to get good results at 3+ amps.
Got mine also today.
After a few minutes on high, it gets very hot.
Is this still safe for the battery, I don't want it to explode in my hands.
How many XML lights do you own?
Unless you have unusually heatproof hands it will get too hot to hold before the cell overheats. But when it gets too hot to hold, I'd take the cell out and let it cool before using it again.
I've got a TD15X, one of the hardest driven 1x18650/2CR123 lights/2x18650, and 2 more eventually making their way to me,but I can read graphs and interpret data.
nice light, 105 dollars 
!!
Yep, although I sorta think I might of gone with the TK35 for the better form factor in 2x18650. However, I could never use the throw of it-the TD15X pretty much throws way to far already, though I love the massive hotspot outdoors, and I probably will run it on 1x18650 when I'm camping.
When I'm out in the wilds I tend to find I use the low power / low output lights a lot more. But the throwers when you have a kilometre or so line of sight are a lot of fun. If I had to carry them on my back rather than in my car, I'd not bring a thrower at all - it'd be one of the pure flood headlamps I own. If the car is carrying them I'd bring every light I own. But there are no large predators here - the last wolf was killed in the 16th century. YMMV.....
[quote=srfreddy]
Yep. You practically have to solder the XML directly to a giant block of copper and cool it with a fan to get good results at 3+ amps.
[/quote]
I mentioned this before in the MadMatch build thread, but it bears repeating. During testing I observed extremely minor gains past @3-3.2amps. Pre-build test had 7 XM-L's mounted to a 10 pound block of pure aluminum. Regulated bench power supply was used, along with a Fluke 724 w/ RTD to track temps. Throughout the tests, emitter base temp never rose more than a degree. Any gains available at 4+amps should be magnified by the use of 7 emitters, and to the human eye there was only the slightest increase. To me, certainly not in any way enough to justify the extra power expenditure. I did not use a luxmeter to do a ceiling bounce, just the naked eye.
Lux figures may show an exact quantitive increase, but I'm not in the habit of illuminating the night with numbers.
What were they mounted on?
Wet ground just eats light up though, and when you're running, it takes a TON of output to not trip over something on blackish ground.
Phoew it feels good to be back at this site!
(haven't been posting for quite a while, since my wallet didn't allow me getting any ore crazy then i already was! :p )
but now the bug has bit again and HARD!
Ordered myself a grey L2P, a black L2P, a L2I, some bezels, some coated lenses, some manafont ultrafire drop ins and this yezl today...
DAMN YOU REVIEWERS!! :d
No seriously now, thank you very much for this review Match i've been reading a lot of your posts lately and every single one of them is very interesting to follow!!
First i doubted at this light but after seeing it in action with thommy (who happens to be the father of my girlfriend) i just had to buy it!
This light really is a portable powerhouse!
I would also like to add a thanks to Ric Thomas (salesman of cnqualitygoods who you can add in messenger) for his help and for giving me the 10%CPF discount rate...
(God is my witness that i only have that account for getting the 10% discount 
)
So thanks again Match and please keep us entertained with your interesting posts!!
Welcome Back, KDLST! Thanks for the nice comments, and I'm happy to be of service! Since writing this post, I've rectified the minor gripes I had with this light and it's quickly becoming a favorite. The one thing I wish it had was a deep pocket clip. Guess that just gives me incentive to make/mod one for it.
Btw, Ric is now giving that same 10% discount to members here as well.
If this light just had a low that I could use, I would be all over it. My typical use is in the house and walking to/from the car at night. Any more than 10 lumens is too bright for my most used level. Rough number since its floody.
Has anyone changed the driver in one of these to get a decent low and maybe current regulation? If it comes apart easy, this might be a great upgrade.
Just got my Yezl Z1x in the mail yesterday. This is my first 18650 light. All my other LED lights are smaller lights using AA, AAA, or CR123 or similar sized cells.
My first impressions:
(1) Build quality looks rather shoddy - the anodizing looks cheap and the lettering looks painted on and is not at all crisp. Even worse, the bit of plastic at the base of the lanyard looks to have dented in the thin outer edge of the lanyard mount on the casing of the light. This dent is quite large - perhaps 2 mm deep and is very visible. The anodizing around the edges of the dent has cracked and flaked off. The build just looks and feels cheap.
(2) The tailcap unscrewed smoothly and the battery fit fine (I used an AW protected 2600 mah 18650). Turning it on... WOW! This sucker is BRIGHT!!! Far brighter than my Thrunite 1C (estimated at 450 lumens), or my Xeno E03 with XML (estimated at 490 lumens). The beam is ringy due to the small smooth reflector and large die, but this isn't really a problem because of the huge amount of light coming out of the front.
(3) Too heavy for EDC - The Yezl doesn't look that much bigger than the Thrunite 1C. They're almost the same width and the Yezl is only about an inch longer. But the Yezl feels like it weighs around twice as much. This is probably due to the weight of the heavier battery combined with the Yezl's thick pill. The Yezl fits in my pocket, but I don't think I'd carry it as an EDC light unless I knew I'd be needing a strong light.
(4) Grip feels decent - the knurling on the Yezl is very subtle. But it's enough to make the light feel secure in the hand.