Itās usually best to start by seeing if anyone has already modded the particular light you want to use as a host. Then you can find out if there are triple or quad spacers already made to fit. Assuming you canāt mill your own spacer, you might have to stick with a single 6v emitter.
Is there a specific UI you want to use?
I didnāt see any 15mm 6v drivers from MTN, but Lexel might have one. Thatās my main 2 sources.
Thanks for your answer Jason!
That driver from Lexel, Iād need to use XHP50/70 leds with it?
The specific light in this case is the Lumintop Tool 25 that I received today and that some people are probably receiving now, or will receive soon.
So this light itself, I donāt think people have modded yet.
I would probably use only a single emitter, but not sure which one could be driven by 2 cells and the [INSERT NAME] driver.
The UI could be Bistro (in Lexelās drivers) or guppy3drv (MTN drivers). I pointed these 2 as I know they sell 15mm drivers, but then, again, I am not sure if they will be able to work with 2*14500 cells, and which Leds will work on those conditions.
Besides this light, some of these questions are also applicable for the mod of the BlitzWolf BW-ET1 (side switch) that I intend to mod.
Iām not sure if anyone makes a Buck driver that small, so you might be limited to a 6v led.
The XHP50/70 are 6 volt, but there are others out there. Iām not too familiar with them. Maybe someone else can comment on them. (Nichia 144A is 6v)
The xhp50/50.2 does not like FET drivers. The 70/70.2 would be fine with FET.
I really donāt know what kind of drivers are available in that small size. I think thatās what you need to find out first. Iāve never built anything with such a small driver.
Maybe the driver size is similar to the earlier Tool AA. Have you checked Tool AA threads?
Sorry Iām not much help.
If 1+1 is 2, then shouldnāt 2+2 be 3?
If the government tells you that 2+2=5, then that's what it is.
Hey Jason, thanks again for the replies!
Bummer that there are not small drivers for these kind of things :zipper_mouth_face:
The driver is custom shaped and has 14.3mm diameter and then some wings that make it go to 15mm.
But a shaved 15mm driver would make the job!
Then the LED pcb is also very small, like 12mm diameter, but the pill allows for something more!
I will have to explore what the host allows me to do, and seek what drivers vs Leds will fit the mod!!
Thanks again for the reply!
If anyone else has a hint on these stooooid questions of mine, please let me know 
Can anyone tell me what Iām doing wrong? This is the first time I held a DMM and I canāt seem to measure current. I followed the manual to the dot but nothing is happening.
If it helps:
- I tried to set the dial to microamps and switched the red lead to the right port and it seems to work fine(as in the light lights up but canāt measure anything because itās overloading).
- I watched djozzās video as well as a reference.
- The light is a Convoy S2+, biscotti, 6x7135.
Note: Image shows the DMM in a negative value even though the leads are not touching anything
Donāt exceed the amperage rating for the ports as you can blow fuses and the correct fuses are hard to find.
Everything looks fine. With that type of light you have to connect and then disconnect reconnect fast like a half press of a tail switch to cycle modes.
Make sure the one lead is touching clean, raw aluminum.
My meter reads the same regardless of polarity. You can try switching the leads around to see if it makes a difference with your meter.
Is the flashlight turning on?
Thanks for the feedback JasonWW.
I tried connecting the negative end of the battery with some wire laying around and connected it to where the red lead is touching and it turned on so I assume thatās a correct place to put it?
It didnāt when I did it before. Just keeps showing a negative value from 0.2-0.5mA.
It doesnāt turn on at all. Iām not sure if itās my lack of knowledge or the DMM is just defective. Voltage measures fine though.
You might have blown a fuse inside or the fuse might be missing on the 10A side.
Keep in mind that DMM are only good for measuring low currents accurately. Above a couple amps they can be off by a lot. For accuracy you want to use a clamp style ammeter. I only use my DMM ammeter for moonlight levels and parasitic drain measurements.
I see, Iāll try opening it up. Thanks for helping me out!
Edit: Confirmed it was a blown fuse. There was 2 inside and swapped it for the one in the micro amp one and its working now. Still need to find a new one though. Thanks Jason!
One thing you learn quick about DMMās is that you keep your probes plugged into the voltage holes.
When you put the probes in the amperage holes to measure something, put them back on the voltage holes as soon as your done. If you forget and then go measure a batteries voltage, the fuse will blow right away. 
After you do that a few times and have to order special fuses you learn not to do it any more. Itās a real pain in the rear.
No, because ā3ā already has an intrinsic and local value equal to 1+1+1.
+1 this
This is why I have two DMMās dedicated to Amp measurements only :person_facepalming:
BTW, those Aneng DMMās are pretty precice. Considering the price.
I have an Aneng 8004 thatās only used for milli/microAmp/parasitic drain measurement. Compared to a calibrated Fluke DMM, the yA are āonlyā off by 1-2yA :student:
Anyone having facebook problems atm
Iāve got a couple potentially stupid questions.
1) Iāve got a utorch lantern/bug zapper that takes a 18650. It has a sleeve inside that when removed it looks like it can fit a 21700. Will this break the light? isnāt the voltage the same?
2) Simon already said no, but if I had a convoy m3 that takes one 26500 battery and found a long enough tube to fit two 26500ās would it break the light? why?
Thanks!
1/ 21700 batteries are fairly new, and predominantly used in high-end flashlights. Thatās why I think this sleeve is meant to fill the space needed for a 3*AAA battery carrier. Those have a diameter of a bit over 22.6mm.
Edit: a 21700 has the same voltage as an 18650, that does not hurt a bit. But I may be too long to fit.
2/ 2 batteries āin a rowā have a voltage of 2*4.2V = 8.4V. You fry the driver when that is built for 1*4.2V.
I bet a 26650 battery may fit
And yes two batteries stacked together results in 8 volts instead of 4 volts
I found the perfect holster for the emisar d4s, I just received it today. It is a pistol magazine/flashlight holster I found at my local academy
Any way I can upload a pic on here to share? I may find the link on academyās website and copy and paste it but Iād rather show you guys how perfect of a fit it is!!!