“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.
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!
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.
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…
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.
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
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