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

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giorgoskok
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Received another ut02 (cw) some days ago , and this particular light is making 1040 lumens .

DB Custom
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FWIW, without the lens mine is making 1159.2 lumens, so there is some 48 lumens blocked via the lens… which actually speaks very well for the lens of choice they put in this one! Wink

cdjaney
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DB Custom wrote:
From post #179, earlier this evening…

“Just pulled mine off the shelf, well rested, and it does 1070.2 lumens for 2 minutes then takes 30 seconds to ramp down to 745.2 lumens where it sits stable for over a minute and I cut it off, the head is warm to the touch.”

I may not be a mathematical genius but even I can garner that 1070 well rested lumens is much more than half of 1300 ANSI rated lumens. The well rested cell in question is an OLD Moli 26700 sitting at 4.02V.

Edit: For the record, my UT02 with a Sanyo 20700B cell at 4.15V makes 1107.45 lumens. As tested moments ago before plugging the light in for charging.

Edit II: With the 20700B cell charged in the light, it makes 1111 lumens.

DB…..I can’t remember. Is your UT02 stock or did you mod it (resistor mod, bypass etc)?

John 1:5 "The Light shines in the darkness, and the darkness did not comprehend it."

DB Custom
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It’s stock, kept it that way for the comparison to the U21 and find I rather like it… don’t want to replace the driver due to the 3A built in charger.

Or that’s what my memory tells me, I’d have to open it up and look to be 100% sure.

giorgoskok
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2A battery charger .

Btw , modded a lot of them , and if someone wants could probably keep the charger , I’m now working on one like that …

DB Custom
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Confused now, sure thought it was the UT02 that had a 3A built in charger… now I can’t find if there’s one I have that does or if I just got it wrong. Thanks Giorgo.

maukka
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Mine rises slowly up to 1.9A. 3A would be quite difficult for most USB power supplies.

DB Custom
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But of course, with most USB outlets having a 2A max. Seems there was a light that had more than one USB charging port that could be used simultaneously to charge faster although that’s not where I got the 3A figure, must’ve just made that one up. Sick and tired of being sick and tired…

maukka
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DB Custom wrote:
But of course, with most USB outlets having a 2A max. Seems there was a light that had more than one USB charging port that could be used simultaneously to charge faster although that’s not where I got the 3A figure, must’ve just made that one up. Sick and tired of being sick and tired…

Yup, the MecArmy PT60 for example goes to almost 3A with three micro usb charging ports (or just one if the charger is up to it).

nodoubt
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mine makes close to 1100 lumens, and 99 k lux, its nw

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giorgoskok wrote:
Btw , modded a lot of them , and if someone wants could probably keep the charger , I’m now working on one like that …

I ordered last week an UT-02. I will be interested in the details of your build to keep charger and make better driver. Please inform me when you do it. So then If I will be unhappy with performance I can make an upgrade. Big Smile
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I just got mine. It only does 2,2A at battery Sad The lowest I ever seen for a UT02 in this topic.

giorgoskok
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It depends on the battery . The lowest it draws , it’s more efficient .

Check OP here : http://budgetlightforum.com/node/51557

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Mine has black LED centering ring and no manker branding on any boards.

giorgoskok
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U21 changed centering rings too 1-2 months ago , i remember reading this somewhere

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Well, after modding 3 of those using r100 and running them moderately for already 3 month( security and hunting mainly, like every night) we could say the driver seems to be stable enough.
3d emitter, tail amps at 4.2, candelas 135k

Do not apply more agressive modding cause the driver will fail, i have several failed so far

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Thx! I will do the R100 mod.

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Mitko wrote:
Well, after modding 3 of those using r100 and running them moderately for already 3 month( security and hunting mainly, like every night) we could say the driver seems to be stable enough.
3d emitter, tail amps at 4.2, candelas 135k

Do not apply more agressive modding cause the driver will fail, i have several failed so far

Mitko, can you tell us where the driver is likely to fail? Thanks for any help here

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Most likely the power elements: the coil and mosfets: i`ve examined only 1 of those failed drivers actualy cause its hella time consuming and those elements were fried, prolly due to the heat caused
cooling this driver is a must btw, it heats alot, those lovely sillicone cubes will help

Also using a 1206 as a mod R would be good too, the resistor also generates lotsa heat so a bigger one is actualy a good idea

gastonpatagonico
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Hi, which batteries does mitko use? I measured different distances, with liitokalas and does not exceed 119000 cd in 7 meters, greetings !!
Mitko
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Efest Purple 4200 with a bypassed front spring ofc, on some of those torches the centering ring needs to be tuned too( usualy sanded a bit, but only an idea)

I dont have a reliable Liitokala source anymore….EU regulations… i have a feeling they will ban flashlights sooner or later

gastonpatagonico
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Thanks for your prompt reply, regards!
Lj-_-
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So it’s safe to mod with a 100R resistor?
Is wiser to use some silicone heat transfer cubes with just the 100R only mod?

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I was about to buy it because of the 33 USD deal, but then I read a few reviews and I really don’t like the fact the the led is underdriven. Actually I was looking for thrower bigger than my C8 (not huge like the convoy L6, still easy to carry), without spending too much, but I don’t think this UT02 will significally outperform my C8 with XP-L HI and FET+7135 driver… so what’s the point in carrying a bulkier flashlight?

I mean, the host looks awesome, but considering the 12V Led and the electronic switch, I don’t think it’s easy to swap just the driver (I wouldn’t care losing the charging if the led is driver at its full potential). The people who had the failed driver, what have you used to replace it?

Of course modding the original driver is always an option, but this particular light seems to have an easy failing driver even in stock, like stated in the posts above…

I a bit confused :s what would you suggest? Also the deal is ending very soon…

Lj-_-
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I am trying to remove the head from the battery tube but it seems to be stuck. Is it glued on?

ZozzV6
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I have the same question.

giorgoskok
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Lj , is your led centering ring black too ?

If yes , they are probably glueing them in the last batch

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Yes, the centering ring is black.
Any recommendations on breaking the glue?

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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

Lj-_-
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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.

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