despite the desciption the driver I mentioned does not have low voltage alarm.
the seller i bought it from wants me to send it back.
I do not think this will help because I suspect the whole batch of drivers does not have low voltage alarm.
I ended up buying a more expensive 17mm 8x7135 driver($10) which hopefully does have the low voltage alarm as promised.
Do you mean its stock driver does not have low voltage warning?
And you bought one piece of 8x7135 Nanjg driver at $10? That is very expensive and may I know where did you buy it from?
The stock driver in my light. Which is probably the same as the one in yours and most others have good current regulation (about 1,8A to the emitter) when input voltage is from 8,4V and far below 5V. I did not see any low voltage warning or cut off. It could easily drain unprotected cells below 2V without the user noticing. I would certainly recommend protected cells with that driver.
i replaced the stockdriver with a 8x7135 driver to make sure i get 3 amps to the led.
indeed the nanjg driver is not that expensive ($3 at fasttech)but the type i bought has a bit better finishing and a better spring.
i bought a 20mm version and i like it a lot
because of the bad exerience with a driver without low voltage warning i wanted to make sure i got something OTHER then a nanjg
i will use the 7135 from the other driver to boost the one i bought to 4 amps
this is the one i bought of ebay(yes it is expensive but quality looks similar to what i bought before and that one was really good.)
At last i have received my light my 1st zoomy it is well made ( built ) big head with big glass lens i like it soo much it feels good in the hands
about its driver i think it canāt be resistor modded right ?
I put in a modded LD-40 with an R120 stacked on top of the original R100 resistor and 340kcd is the best I could get with dedomed XP-G2 S2 2B. 
Current measured at tail is 2.60A with two 18650, that translate to 4.30A to the LED by estimation. I have modes problem with the LD-40 when using two 18650, may or may not fix it though.
did some testing tonight to see how far it would reach
i have 3 windmills at my horizon
windmill at 1270 meters, no problem, lights up in the dark sky
windmill at 1380 meters, no problem, lights up in the dark sky
windmill at 1610 meters, does not light up in the dark sky
so with a fully charged 18650 IMR and 3 amps to the XP-G2 led the range is about 1400 meters i guess.
do not know the light intensity but in the end range is what counts.
do you have pictures from that comparison?
To those who are doubtfull of the range spotting of windmills I'll just add a few observations.
Windmills are oftenmost whitish/light grey.
They are slightly reflective due to this. The ANSI standard limit of vision (0,25 cd) is based on a non reflective surface. Removing this limitation makes almost any light have endless range as you could theoretically set up a perfect mirror the size of a barn to make sure your single aaa light had a 3 km range ;-)
I have spotted windmills at 900 meters with a ~35 kCd light (kCd measured by myself later).
Due to having no spill at all zoomie lights do not reduce your night vision as much as reflectored lights do as the "backscattered" light from the spill of a reflectored light plays heavily on your eyes. Especially high powered ones (lights that is. My Eyes do not require external power :-p )
My modded LD-40 is pushing >4A to the dedomed XP-G2 and it only give me 340kcd, that translates into 1166 meters.
There is no large open space or buildings from very far away to aim my light at around here.
I don't know about these, but the common dutch windmill is brown (covered in reed) and not reflective, apart from the blades, they aere mostly white
Ah yes. The Dutch. I was of course referring to electricity producing wind turbines as they are mostly seen in Denmark. Sorry.
LOL, I guess that I am so dutch that I only thought of traditional windmills. Now I see that it makes more sense if gravityZ referred to modern windmills :-)
need help plsā¦
i tried to get the pill out
like the first time when i got the light and lubed the sealing:
unscrew teh bezel, use needle nose pliers and turn
that was easy then
but todayā¦ lets say: if i had a swear jar i had to put a lot inā¦
the pill does not move.
in no direction (should be counterclockwise to get it out - right?)
any ideas?
could it be that the pill got a ābumpā from the head when screwed out while zooming?
i will try the heatgun tomorrowā¦
-> i did not play more than 5 minutes since i got it
Both of the pills in my 1405 screwed out easily clockwise.
clockwise??
Yea itās reverse threaded.
BINGO! it is open!
i tried cw - but not hard enoughā¦
thank you!
which resistor did you pigyback to get which Amps?
-> i read 0,85 A stock
For one light I stacked 2 r150s on top of the r120 to get 2.6 at the tail from 1A stock. For the other one I swapped out the driver for a nanjg at 3A but more will be stacked to 5A
the windmills indeed are grey and used to generate power.
i do not think they are replective but since they are grey they will stand out the background more easily then other objects.
having said that i still the UF-1405 is superior because of the big lense.
i gave an exact same setup(8x7135 driver, xp-g2 dedomed, 1x 18650) in another zoomie with a 35mm lense. that one could barely light up the first windmill at 1270 meters and did not reach the others. so if that light is not able to do the job then a zoommie with a smaller lense or aa batteries is definately not going to reach it.
give me some time to should some photoās
i will wait for ideal conditions and try to shoot a photo while lighting up the windmill.
last night had a clear sky but also a full moon which is not very good for contrast