UltraFire UF-T20 Mini review.

My thoughts and impressions on this light.

I bought this light from the MF special that was on The Flashlight Emporium. I have been using this light for a few weeks at work inspecting under and around trucks.
I initially tested it on a lithium 14500 but the light would shut off after a couple of seconds so has not been used since. Protected 16340 batteries off the Trustfire name do not fit as there to long and again I would not use them in this light due to the voltage anyway. CR123’s fit fine but I have not used them enough to comment.
I dont have a lot of small off the shelf lights to compare this too only lights that I have built. The hot spot from the XML led is to me amazingly small. In small lights I’ve built I’m used to XML’s having a flood of light but this has a distinct hot spot and a good spill. The light to me appears as a neutral to very slightly warm tint.
The lens is advertised as being coated. I cannot verify this as it appears to be clear glass.
There is no knurling on this light. It is merrily thin lines machined in a crosshatch pattern and it is indeed very smooth.
PWM is not real good. If you dont like PWM dont buy this light.
I’m a fan of the deep bezel as this light has only been carried in my pocket which usually has keys in it. The deep bezel has prevented any damage to the lens and so far free from finger prints. It does affect the beam slightly but to me its more of an advantage than disadvantage.
I have not used the clip at all but it appears well made. I will not be removing it as I can identify where the switch is as its on the opposite side. The switch itself is tiny and has a very firm push to it for turning on. I doubt anyone would accidently turn this light on in there pocket. I do have a problem with its tiny size though which in all honesty is not a problem, just my big mitts. From new I had issues with the light working erratically. A quick squirt with some CRC internally to the switch has fixed this problem of dry contacts.
Anodizing from new was well done. It is showing a few small marks in it now but that is from the constant contact it has with the keyring that resides with it in my pocket.
I’m not a fan off flashy modes and these are well hidden and not likely to be found by accident.
The magnet on the tailcap works well and so far the light does not look like falling of anything it is stuck to.
This may not be all that hygienic but the two things this light is crying out for is less PWM and something rubber or the likes that slips over the tailcap so that you can hold the light in your teeth. I’m sure I’m not the only one that does this.
The variable brightness works extremely well. The only thing I would change here is a pause at maximum brightness and minimum brightness. As it is it just goes straight through both.
Overall I’m a fan off this light. It would off been better if it ran on 4.2 volts and protected 16340 batteries.
I apologise for the lack of pictures but I’m a bit out off action at the moment. Thanks for reading.

Thank you! :slight_smile:
Sounds quite positive so far.
One of this lights is on it’s way to me.
I’m curious if it will like my LiFePO4 14500.

Thanks for sharing! :beer:

Looks like a nice light! :slight_smile:

Hi dave_. It works fine with a Coolook LiFePO 4 and to boot is a bit brighter. I haven’t done any long term testing with this type of battery.

Cool

Mouth hold .

My EDCs have to be drool-proof .

That’s nice! :slight_smile:
Since 16340 Li-ion won’t fit or work, that would be my preferred battery type.
I’m really looking forward to get it. :slight_smile:

Too bad it doesn't pause. That's a killer. I could probably deal with the PWM.

So, mine was in the mail today. Almost disturbing fast customs handling. :wink:
The blue Solarforce protected 16340 fits just fine:

A little snug at the sides, but you can still shake the battery out and the tailcap screws on without any effort.
It also runs fine on the Li-ion cell! Maybe your driver is somehwat defective?
But as expected, the whole light gets very warm after a couple of minutes. Perfect for the freezing girlfriend/wife/daughter at the next outtoor trip or festival. :stuck_out_tongue:
I like it quite much so far. But if you are sensitive to fast flickering (get headache from LED car backlights etc) you really won’t like the PWM. :smiley:
The reflector makes a nice hotspot, I am very tempted to try a de-domed emitter tonight. :smiley:

Your a braver bloke than I am dave_. Looking forward to your de-domed experiment.

I had modified mine a while back, and before I did that I did a (super) mini review here - https://budgetlightforum.com/t/-/12119#comment-271430

I ended up tossing the head on my lathe (one of only two times I've used it so far) to open up the driver mounting location to 16mm IIRC. I used a brass adapter ring to then install a NANJG 105C that I programmed to ramp better and allow cycling of modes.

It's a handy light. When my roommate was moving in in the dead of night I stuck the magnetic tail on the inside of the moving truck to provide some light for us. I made the mistake of having it on too high of a mode, because when I went to grab it 20 minutes later it nearly burned my hand.

@MRsDNF
Not much bravery required, but a calm hand and some patience will come in handy for sure. :wink:
Not much room in that thing.

Taking out the emitter was alone worth it just to remove that white thermal goo.
Easily 30…50µm of that stuff between star and light. :Sp



Well, if you imagine that I had actually centered the emitter well (:P) it wouldn’t look that bad.
But I will swap to the other emitter back anyway, I think it’s more useful in stock condition.

@JonnyC
I can totally see one burning oneself on that light. :smiley:
It gets hot really fast.

Thanks dave_. You dont know my record on de-doming. For an XM-L in a small light I like the beam pattern a lot the way it is. Must be magic in the reflector. :wink:

You have used your lathe twice JonnyC and not shown us a picture? Shame. I’m as good on electronics as I am with de-doming. I haven’t used mine on high long enough to get that hot. Its good to know that it still worked. Cheers guys

Yeah, I already put the original emitter back in the light. It’s fine the way it is. :slight_smile:
I am also impressed with its performance on an Eneloop, makes it really versatile.