2800 / 0.75 = 2100. 10% for glass, 15% for reflector? Maybe.... But reflectors usually are 20-25%. So not sure...
Haven't measured the tail current, with that info i'd be able to make a better informed guess.
Measured 6.1A on a 26650 MKNE IMR at the tail. Kaidomain 32600 5.3AH measured capacity gave me 5.6A. But both are 4.1V, not fully charged.
Not sure what's the output though. Must be careful when doing highest modes and i am trying to do it long enough just to get a reading, i am not sure if the driver is straining.
That’s a couple of drys and beamtech4000’s lol. It’s huge but beautiful
I measured a MKNE IMR 26650, got 6.3A. Closed the tailcap and measured. Yep got the same 210 ceiling bounce values as 3 x 18650s. Interesting, so the U2 LEDs are not driven to the max. That's a lot of output for so little current!
Tailcap current, i used a MKNE IMR 26650 and measured 6.3A. Closed the tailcap and got the same output ceiling bounce values as 3 x 18650. That is a lot of output for so little current. In high, that 1h 35 min runtime is absolutely believable. You use 3100mAh cells, draw is 6.3/3 = 2.1A. That's 1.5hours. It's actually more complicated than that but i am keeping it simple here.
Nice looking light! Price isn't in my budget though.
I linked to one of the images at the top of the post for the teaser, and made this review Frontpage and Sticky. (Moved to 18650 flashlight reviews)
Thanks a lot!
I didn't realize XTAR had a 3*XM-L fatty and this is a beaut. I definitely want, but won't be able to consider at all because of the price tag. Thanks for the review!
Thanks. Yeah it's really a beauty and most important of all this feels like a very serious light when held in the hand. As said elsewhere some of your fav/regular dealers could give a better price if you negotiated. Some folks don't want a TK70 but want to retain similar performance (the form factor of TM11 occupies another niche, budgetlight equivalent would be the DRY) and i figured this hit the right spot.
With batteries, this weighs just over 1kg, all contained in that form factor that is just a wee bit bigger than the RRT-3 XM-L. Crazy. And it shows in the heat-related performance.
Thanks for Pictures and Review
Can you comment of the stiffness of the magnetic ring? Will it wear out anytime soon or become loose? Thanks!
The tactile feel of the magnetic ring is pretty good, enough resistance and also ease of twist. I'd say same "quality" of feel as the SWM V60C. There are indents and i don't think it would wear out.
Thanks 2100. Can always count on you.
I have a TK70 now but Im quite tempted by this S1. Do you reckon its worth selling the TK70 for this? Although I do hate the PWM of S1 (its such a good torch, it shouldnt have PWM! )
The TK70 is a good flashlight, i am using it in 3D config with 2 x unprotected 32600. Hence there there is always a small risk even though i keep that at bay with regligious voltage checking. 4 x NiMH is too unwieldy for normal daily use. It's not the weight but the very high polar inertia, you cannot swing it around easily.
Both put out the same amount of light OTF (you can't notice the diff, trust me). As for throw, it is 60k vs 90k cd or 33.3% diff, so it is just a little visibly cut in throw. I have always maintained that you cannot tell any difference if it's < 20%. As you can see in the pictures, there really is just a wee bit of difference and only noticeable when you directly A-B them side by side.
The Xtar S1 is definitely much easier to use and bring around, even in a small haversack stuffed with many stuff like food/water. It is not a EDC even with a holster though.
I am current talking to Xtar HK to see if they can bump up the PWM. As for efficiency of this vs current controlled, well it is a triple XM-L and 3 x 18650...how much runtime do people want? Triple XM-Ls are already very efficient even at 1000 lumens. LOL!
Thanks! PWM for me is about it annoying me. I can detect it quite easily and its rather distracting. Unless they remove it from their final model, i think this isnt the light for me :( and i did want to like it very much!
I told them to see if 1-2kHz region is ok to do (that's the iTP flashlights frequency). They have some reason not to do it at 20kHz, not sure why but i guess for engineering they'd have their reasons.
But seriously 475Hz is not that bad, it is very usable. This is 3X faster than most budget lights.
My personal preference and priority is usually to use the light more and as often as possible. We are living in cities, we already don't have much chance to use it. Hence I am ok to accept some negatives. Seriously I do use the TK70 quite a lot (several thousand hours), but most of the time it is tailstanded as a night light in the lowest mode. Even in the house i don't manage to bring it around often. The Xtar S1 is definitely not small but it's still ok to tailstand in the toilet and move around etc.... I conbsider that as the biggest size to use.
Eg, The XTAR is as easy to use as your Olight M3X, SWM T40CS, just 2X heavier. If you hold your TK70 in your left hand and a Olight M3X in your right and you move around, the difference is telling.
I think I will hold off on the S1 at the moment. USD200 for a light with PWM is no-go for me, I'm afraid. If they remove, I might think twice. And like you said, the TK70 is just an awesome light!
Where do they get the 2800 lumen figure from?
If you are reading 6.2 amps, thats 2.1 amps per emitter which is what? 600ish lumens each?
The TK70 does 3 amps per emitter which is more like 850 lumens per emitter.
Joe,
(1) The TK70 does not do 3 amps per emitter. As far as my knowledge goes only forummers claimed that. It's probably pretty close, and anyway it's not worth to get into a debate with the other folks regarding this. I dwell more on measuring with the lux meter.
(2) This is U2, if you use the xls LED calculator and key in 320lm @ 700mA, you'd get 816 emitter lumens for 2.1A. You get 899 lumens for 2.8A drive for a T6.
https://budgetlightforum.com/t/-/2525 <<- calculator
(3) Just measured again by cleaning the MKNE IMR cell's surface and pressing harder, actually i was able to get 6.5A-6.6A peak. Unfortunately it's not really easy to measure.
(4) Important thing is, if you look above, TK70 reflected bounce is ~ 220 lux. Xtar S1 is ~ 210 with 3 x 18650. I was able to get this ~ 210 with the MKNE IMR as well with the tailcap screwed on. That is what is important and is accurate. The current reading is for reference only.
Yeah, the final measurements for output are what really matters, everything else is really just working back from that!
Remember that a good high capacity IMR 26650 even under load would be well over the forward voltage of the XM-L LEDs (maybe 3.9v under load fully charged with the XM-L vf of around 3.3v @2.3-2.5 amps) with the full calculation you get:
6.6 x 3.9 = 25.74
/100 x 90 (assume 90% efficient circuit) = 23.166
/3 (3 XM-Ls) = 7.722
/3.3 (each 3.3v vf) = 2.34 amps to each emitter.
According to the spreadsheet that means nearly 900 lumens for each U2, which would make almost the claimed amount at the emitter(s ).
hehe.... Redforest UK's calculations are deep....i understand part of it only at first glance.
Anyway Xtar S1 is 475Hz PWM for my copy (see if production copies are different), that's not too bad and very usable. Just received my 5 x XM-L Trustfire TR-J12, it's 124Hz. Now that's bad!
It's got very poor regulation compare to the Nitecore and Olight triple XML lights.
is this the most expensive DD light?