My 2 cell version runs on 1 cell as well at just over 3 amps. The Xtar 2600 measured just a little over 4.1 volts unloaded at the time I tested it.
Edit: My original test was incorrect at 2.49 amps. Not sure what mode I was in, but it wasn't on high.
Seems like it is direct drive for 1 cell voltage. I tried a lower voltage cell @ 3.75 and it did 1.65A.
Like i said to Agenthex, i need to get a new meter!
What are you using now?
The same one which HKJ evaluated as the cheap meter as in the one you get in MF or DX (DT9205), but the leads are 10A AWG18 ones from my Uni-T. The Uni-T (low-end about $30) went haywire when i measured HID ballasts, you know when a 100W starts up it goes above 10A.
2100, I wish I knew what to recommend. The DMM's I own are close to 10 years old. I'm not up on current models. What are you looking to spend?
Probably a Uni-T 58E, I think the local electronics shop is selling at $50. Actually most models are around there for our really simple usage in this $$ range. For Flukes you really need to go the really high-end range.
Looks like a great meter for the money. Very good specs indeed :)
The specs are definitely not real. But I guess hopefully would be better than the really cheapo meters.
So you're saying it's like the Lumen ratings of cheap Chinese flashlights. What has this world come to lol!
i have not tryed my TR-3T6 3 x 18650 on 1 x 18650 only the normal 2 x 18650,s and the 3 x 18650,s im happy with running two most of the time, i didnt buy this cause it was a pocket torch i have others for that.
its the same as my TR-1200 it can run two or three 18650,s and the battery tube, extention tubes, glass lense and tail cap are all the same.
the only diffrence is the alloy ring inside the bezile on the TR-3T6 is where the TR-1200 drop in screws into and the head has less fins and the TR-3T6 head is larger and made for a screw in, the TR-3T6 it better handled for heat, but ive ran my TR-1200 for many 30 to 50 mins runs on high and one 85 min run on high and its current is pritty steady.
so the TR-3T6 host is just a modded TR-1200 host thats seams to be pritty common on the budget lights use in alot of torches from all over.
Does anyone know of a forward clicky that can be used with the 3T6?
today i had some time to kill today so i thought ill do a test on the TR-3T6 Triple XM-L 3 x 18650
using two trust fire flames resting voltage 4.12v
internal resistance of the batteries 150 mΩ but you have to take into account my soldering the rare earth magnets and the 18 awg main charge leads.
at the start of the test 2.6 amps at the tail cap (i get readings from 2.6 amps to 2.9 amps with my trust fire flames depending on the Ir of the batteries) for the test i used the lowest current draw of the batteries i have.
starting temperature was 19 degrees c (66.2 f) on the torch head between the bezel and fins and i used a small desk top fan on high to act as active cooling, i would of done this test with a bush walk with the torch on high but the weather has been crap.
run time of the test is 30 Min's timed on an iphone 4 the torch was ran on high mode the whole time.
end temperature of the torch was 29c (84.2f) i unscrewed the drop in (screw in) as quick as i could but by the time i got it out it was 22c (71.6f) all temp readings where done with a digital laser point temp gun at a distance of 300mm (12 inch)
at the end of the 30 min test the current draw had rose to 2.92 amps and the resting voltage of both cells where 3.76v.
i used an old fluke and a cheap DMM to confirm results
i will repeat the test using 3 x trust fire flames over a 45 min period
today i had some more time to kill today so i thought ill do another test on the TrustFire TR-3T6 Triple XM-L (3x18650)
using three trust fire flames resting voltage 4.15v (average)
internal resistance of the batteries 223 mΩ (average) but you have to take into account my soldering the rare earth magnets and the 18 awg main charge leads.
at the start of the test 1.58 amps at the tail cap. (i get readings from 1.5 amps to 1.7 amps with my trust fire flames depending on the Ir of the batteries).
starting temperature was 20c (68f) on the torch head between the bezel and fins and i used a small desk top fan on high to act as active cooling, i would of done this test with a bush walk with the torch on high but the weather has been crap.
run time of the test is 45 Min's timed on an iphone 4 the torch was ran on high mode the whole time.
end temperature of the torch was 31c (87.8f) i unscrewed the drop in (screw in) as quick as i could but by the time i got it out it was 23c (73.4f) all temp readings where done with a digital laser point temp gun at a distance of 300mm (12 inch)
at the end of the 45 min test the current draw had rose to 1.65 amps and the resting voltage of the cells where 3.76v (average)
i used an old fluke and a cheap DMM to confirm results im pretty stoked with the results 
Thanks for the measurements, only confirms that I think this is the best deal I have ever gotten on a flashlight, mind boggling compared to what was available just a few years ago when we were paying $80 for Fenix's with 1/20 the output.
Great forum
have the comparison with sky ray?
nice i wondered why it was so deep
Hi, i just realized great thing(at least for me). Thanks to buck/boost driver used in our 3T6 lights we can use 4xAA to power them. They will fit in almost perfectly(with extension tube) and due to strong springs on both sides there is almost no rattling so no modding is needed. I know that this is not for general use but as a backup in low mode it's perfect.
I did a quick measurement:
4xAA rechargeable 2500mAh total 4,82V(not fully charged)
HIGH mode 3,05A
MED mode 1,55A
LOW mode 0,34A
Interesting find, thanks, but only possible in the 3x18650, not in the 2x18650