Review : Utorch UT02 Flashlight (XHP35 / 26650 / usb rechargeable)(in progress)

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Lj-_-
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Lj-_- wrote:
AlexGT wrote:
Heat and strap wrenches, for heat you can put it in boiling water, inside of a waterproof bag, the temp will never rise above 100°C, use gloves.

That is how I managed to open my TN-31


Thanks Alex, I’ll give that a try. I assume wrapping the torch with a piece of thin rubber and using a nylon strap wrench would be best.

Ok, so I don’t have any strap wrenches, so I improvised….!


I tied some pieces of paracord to two screw drivers and wrapped two pieces of thin rubber around the body and head of the light. Then I wrapped the paracord in opposite directions several times until tight and used the screwdrivers as leverage. Same principle as using strap wrenches.
No heat required, just brute force Cool

ZozzV6
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Great work! Thumbs Up Tomorrow I will do mine! And add some resistor to bump up the current to a bigger but safe level.

Lj-_-
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ZozzV6 wrote:
Great work! Thumbs Up Tomorrow I will do mine! And add some resistor to bump up the current to a bigger but safe level.

Thanks.
What resistor value are you going for? I’ve got some 100 Ohm resistor’s that I’m going to try.

ZozzV6
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Do you mean R100 labeled resistor? That is 0,1 Ohm. I have a lot R100 so I try it with that.

Lj-_-
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ZozzV6 wrote:
Do you mean R100 labeled resistor? That is 0,1 Ohm. I have a lot R100 so I try it with that.

Yeah I meant R100 not 100 Ohms Facepalm

SoCalTiger
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In case anyone is curious, this light will work with a 3xAAA battery adapter as a power source. Out of curiosity, I tried it with some fresh AAA Eneloops. Turbo mode didn’t work but on High it was getting in the range of 400-500 lumens. The battery indicator was red in this mode due to the voltage. Not too shabby although I’m sure the runtime would not be good on High. I was considering gifting one with a NiMH option to someone who didn’t own lithium batteries.

Agro
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I’ve had UT02 before and lost it.
Today I received a new one and noticed a big drop in quality:

  • the USB port cover is very flimsy
  • I got a nearly 2 mm dust particle inside reflector as well as small amount of fine dust
  • There’s ~1 mm gap between the head and the battery tube. I see grease shining in it.

KawiBoy1428
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Agro wrote:
I’ve had UT02 before and lost it.
Today I received a new one and noticed a big drop in quality:
  • the USB port cover is very flimsy
  • I got a nearly 2 mm dust particle inside reflector as well as small amount of fine dust
  • There’s ~1 mm gap between the head and the battery tube. I see grease shining in it.

Where did you get it from?

KB1428 “Live Life WOT

Agro
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I think there is exactly 1 shop that sells Utorch lights:
Gearbest.
At least that is where I bought it.

KawiBoy1428
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Didn’t know that Gearbest was the exclusive seller, thanks!

Early on when they first came out I had 2 that where really dirty, the last time I purchased 4 of them was 2 Christmas’s ago and they were perfect. I was about to get 2 more?

Meh back to the quality lottery again… Facepalm

KB1428 “Live Life WOT

hIKARInoob
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No science here… But when they start selling these for less than 30 bucks… yeah, I kinda can imagine manufacturer needs to spit ‘em out faster…

giorgoskok
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Well , last one i received back in November was superb . I guess i was lucky …

I wish there were more hosts with this reflector diameter , like the Supwildfire 18650 light but in better quality .

arficus
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Just got a NW one for $29. Great light. I appreciate the extra capacity of 26650, and with such a large head there’s really no reason not to use one. I would’ve paid extra $10 or so for (slightly throwier) emisar D1s, but it’s use of single 18650 in this form factor seems ridiculous.

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arficus wrote:
Just got a NW one for $29. Great light. I appreciate the extra capacity of 26650, and with such a large head there’s really no reason not to use one. I would’ve paid extra $10 or so for (slightly throwier) emisar D1s, but it’s use of single 18650 in this form factor seems ridiculous.

+ 1 exactly

BLF A6
a few C8`s,
HS 802, dd SST40 @4.6 amps,
P30,
Emisar D1s xp-g2 dd S4 2b
S70s,
UT02 - 5 amps and luv it ! with E2 3C
Klarus G35
Maxtoch New Sniper M24 dd U3
MF02 ,
i think iv got it covered !

komeko
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For some time I wanted to improve my UT02 but … I could not take out the driver. I could not sleep tonight so I took one more approach and succeeded. As it turned out, the tile is slightly different from those in the first versions. You can see big sloppiness. In addition, I received a “corporate modification” in the form of an additional capacitor. Hmm interesting. I added the resistor R100, corrected the cables, cleaned and reassembled. It works and it’s good. The current measurement for 4.15V in turbo mode is 3.93A and in High mode 1.32A. Before modification, I had 2.9A and 0.9A. As I later make a calibrator measurement, I will complete the entry.

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Supplement, before modification, color 4258K and 3292 Lux with 5m:

After modification, color 4332K and 4505 Lux with 5m:

Click on:        ANSI WHITE

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SikSemper
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Lfatman wrote:
Hello.

As the resistor mod using an R050 gets similar readings than Manker U21, and I fear it may be dangerous for the driver, I made this mod using an R100 from Fasttech.

These are my readings

Modes:
1- ———-
2- 0,20A
3- 0,62A
4- 1,34A
5- 3,85A.

I ran it in turbo mode in periods of five minutes until the voltage dropped to 3,5V

4,14V. 3,85A. 144.400 Cd.
4,01V. 5,19A. 146.160 Cd.
3,90V. 4,29A. 143.600 Cd.
3,69V. 4,47A. 145.080 Cd.
3,56V. 4,60A. 143.280 Cd.

In five minutes it gets very hot.

At 3,5V turbo mode is not maintained and the flashlight only has four modes.

Can you or someone provide a like to where you can get the resistor on fasttech? I can’t find it anywhere. Other vendors included. The main problem is that I don’t know what size resistor. Is it a 2512, 1812, 0805, 0603? Thanks

komeko
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The resistor has a length of about 2mm

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SikSemper wrote:

Can you or someone provide a like to where you can get the resistor on fasttech? I can’t find it anywhere. Other vendors included. The main problem is that I don’t know what size resistor. Is it a 2512, 1812, 0805, 0603? Thanks


Since you are in US, I would buy on ebay. I think you need the 1206/3216 size 1/4 watt. This is a common size for sense resistors. If you want R100, look here.
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk...

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komeko
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Too big.
Of course, the larger one will also fit, but originally it is 2mm, at least from what I remember.

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JasonWW
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komeko wrote:
Too big.
Of course, the larger one will also fit, but originally it is 2mm, at least from what I remember.

So like a 2012 (2mm x 1.2mm) or 0805?

Here is one.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk...

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Lfatman
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Lfatman wrote:
https://www.fasttech.com/product/1615807-1206-0-1r-smd-precision-resistors-100-piece

It’s discontinued. That’s why we can’t find it with a search of the store.

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arficus
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So an 1/8 W R100 would work?

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arficus wrote:
So an 1/8 W R100 would work?

It looks like it. They are so cheap, you might buy some R082 and R120 as well. Maybe even some R050 to try out, but it might push the driver too hard.

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vidramon
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I don’t read whole topic but maybe some have the same problem, my sample of UT 02 is only getting barely 800 lumens, and tail current is 2.6A. Ok, I’m not expecting 1300 lumens but 1000 will be expected any situation similar to mine ??

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