Utorch UT02 Review

I believe it’s because of the driver
I read somewhere that the current required by boost driver depends on the input voltage

Pushing it harder against the springs will not change the batteries voltage.

Maybe the springs are low quality and causing a voltage drop to the driver.

Then compressing them so they both touch reduces the voltage drop by half.

It’s odd. Maybe it needs a proper spring bypass on both ends to get consistent amp readings?

That’s what i am talking about
Volt drop on spring makes the driver require more current

That’s what i am talking about
Volt drop on spring makes the driver require more current

So I guess EDSG Chris’s light might measure 5+ amp if he doesn’t press the battery too hard.

I wonder if the early lights reviewed would get about 3.8 if the reviewers pushed harder to engage both springs?

I’m going to pass this information on to them and maybe they can test the theory.

so i found some interesting today
first:
when you press the spring hard(not too hard, normal press to be exact). the current will be about 3,5A, then you slowly reduce your force to spring, the current will slowly goes up to 5.8-6A
but when you press the spring hard again(like how you press at first, and not turn off the light). the current will stay remain, 5.8-6A, strange.
then you switch to low then high again, now the current will be about 3.7A
so

maybe i accidentally active “super turbo mode” :stuck_out_tongue:

Copy your last post here:

It is more likely to be seen by those with UT02’s.

What cells are you using? I am using Samsung 25r in it. 18650 won’t push as hard against the springs.

I just woke up and it’s 4am might as well get do some testing of my own nothing else to do at this time. I’ll try some 26650 in the light.

I done the maths before you need around 3+amps to get enough wattage to produce 1300 lumens.

my cell is protected Fenix 26650 4800mah

btw, my manker u21, i’m not sure if it is an early version, because i bought it about just 2-3 months ago
from hkequipment
ps:anyone know where to buy its lens, i accidentally touch the len with my glued finger, now it’s very annoy to look at its len

It has to be early because the newer ones won’t go beyond 2.8A at the tail cap.

Is the lens coated? If not then you can use any cleaner. I’m guessing it is coated and you don’t want to damage the coating. What type of glue did you use?

You might try some cleaners only on the outer edge that is not seen. If it doesn’t damage the coating, then use it on the glue. Worst case is you make the glass pure with no coating. It’s not too big a deal.

Edit: yes, review says it’s coated. What if you flip the lens so the glue part is outside and then just clean it with a chemical taking the coating off? As long as the coating is on the inside, then all is good. You won’t loose than extra 1% of output. :slight_smile:

it’s coated, and yeah, try many types of cleaner, none of them work
and i has no idea what glue is it, at first i thought the len was dirty, so i kept using it for a short time then notice it’s glue, :frowning:
it’s diameter is 55mm, so i am finding 55mm AR coated lens now

No cleaners worked?

Did you try brake/carb cleaner on a rag and then wipe the lens?

Worst case, use a razor blade.

tried with Bake soda, soap, toothpaste, aceton, and many things, sadly, it’s still there

Is it a chip? A razor blade will get it for sure. That’s how window tint is often removed. A sharp blade will not scratch the surface if you go across at a shallow angle.

Thanks, mate
But not sure razor blade will do, it is very thin, when rubbing it, i dont feel anything

You can use your finger nail to see if its really not on the other side of the lens what you’re seeing. Just becareful not to scratch your lens with your nail.

I just got one and tried it with a half charged cell. Will I get more brightness with a fully charged cell or is the light well regulated?

It’s a boosted driver. 3v to 12v. I’m not sure at what point in battery voltage the output drops.

I got my UT02 today. I really like it, especially with that coupon price. My button doesn't light up at all though, is that normal? Was reading the OP and it mentioned light is purple when off, but not mine.