Uniquefire UF-1405 - A worthy zoomy?

Thank you bibihang! :slight_smile:

You’re welcome. :beer:

can the stock driver(modded with resistors) run a xp-g2 LED? Or what is the best emitter/driver combination for the ultimate throw ?

The stock driver can already run an XP-G2 without any mod, but the current at the LED is not high, which is around 1.6-1.8A only. You can add resistors to the stock driver to bump up the current but do this in your own risk, as there have been a lot of cases that the stock driver failed at high current (including mine). The 1405 stock driver is just a lousy driver to say the least.

For the ultimate throw combination you can use dedomed XP-G2 or XP-E2, but the XP-E2 will give you a laser-like tiny hotspot. To get the maximum throw out of each emitter, the XP-G2 should be driven at 4.2A or a bit higher than that and the XP-E2 should be driven at around 2.4A.

Does it need mentioning that the leds need to be on a copper DTP board?

Yeah of course, thanks for adding that for me. :slight_smile:

Thanks! What driver will be the best for the xp-g2 at 4 or so amps ?

There is no any high current capable buck driver that available in 17mm diameter currently (and unfortunately), even the LD-4B from IOS cannot be boosted higher than 4A or it will behave strangely on the mode changing, and the driver will get overheated very fast. Been there, done that. Members wight and ohaya have done some high current test with the LD-4B (or LD-40) before and both of them did not get any optimistic result either.

Your best bet is to use a 17mm linear driver like the popular Nanjg 105C driver, add more 7135 chips on it for higher current but you can only run your light with a single 18650 in the future. It will still work quite well and the Nanjg 105C normally have more mode groups to choose for. However if this is the way to go, it would be better to order the “shorty” version which is the 1504 in my opinion.

how about wiring 2x18650 cells in a parallel? since the tube is designed for 26650 cells, there is enough room to wire them in a parallel right? Making a “battery tray” (from a spacer like those that come with flashlights that can be run on either 18650 or 2650 cells http://www.dx.com/p/plastic-26650-to-18650-battery-holders-white-2-pcs-186751#.VPyO0lPF9Hg ) should not be very difficult. Do these drivers have a low voltage cut-off?

interesting idea….

My 7135 driver has low light warning(light drops at 5% i think) but it does not cut off. Maybe with costum firmware it has low voltage cut off. Yes that could be easily done but it will not be practical. Since I am hunter I really don't get why more manufacturers are not making similar 2x18650 flashlights like one below

But such design should also be good for regular flashaholic - you can add pistol grip below and fry everybody at 450 kcd for a least 40 minutes

Yeah I think it is possible and I have thought about this before, but I personally prefer to run it with two 18650 in series so I ended up using LD-4B with another resistor added - And again I don’t recommend anyone boosting the current of the LD-4B until too high.

As for the low voltage cut-off, it depends on the firmware flashed on each individual Nanjg 105C. For example most Nanjg 105C will only give you low voltage warning by dropping the output to low mode and flashing slowly, whereas the Qlite variant will cut off the power eventually. It really depends on the firmware itself, and you can make your own alteration if you can flash these Nanjg 105C drivers. Beside that the low voltage warning/cut-off occurring at 2.8V is just too low IMO, it is not good to have your 18650 discharged until that low of a voltage as it can damage your battery.

Well maybe no problem if Panasonic 18650 battery are used (discharge at 2,5V) :) ?

And i saw a HKJ test yesterday of the Keepower IMR18650 2500mAh (the same as the LG ICR18650HE2) thats rated for discharging down to 2.0v :open_mouth:

Interesting... Who will invent some kind of parallel tubes fur upcoming single cell UF version so we can use 2x cell in parallel? In that case I would also rise number of 7135 chips.

Or maybe some of you guys knows where such aluminum 2x parallel 18650 boxes can be bought?

There are lot of plastic ones on net but I did not managed to find aluminum.

Maybe you can use a powerbank? There are plenty to chose from, and many of them are aluminum and some of them can be opened easily.

Yes power bank could be used...

I have been thinking recently about 2x18650 tube side by side(parallel) and below that picatinny rail attachment.

I just cant think of how to make functional version of that for quick and safe swap of batteries.

But now I am thinking on your idea in small configuration. Lets say we have 3x phone batteries in parallel(6000 mah) in some home made small aluminum case on which we can mount UF head and just connect + - wires of battery pack on driver.

It would be ok for simple on/off action.

I am not sure how phone cells would take 4A or more discharge? Maybe that is way to much for them...

If you are talking about running 3x lithium polymer cells in parallel, that could possible work at 4A.

But i haven’t tried anything like that myself, but i know some of th RC guys are using lithium polymer & they often need rather high C values, so my best tips is to do some searches on lithium polymer and various RC uses and you should find some more info or discussion on it.

I didn’t realize that some batteries can be discharged until that low nowadays. Interesting, but I still won’t try that anyway just for the peace of mind. :slight_smile:

No I am talking about real phone cells. Look what I got in one battery package: https://budgetlightforum.com/t/-/32209