It is capable of driving a 3v led with 1s, 2s, 3s and even a 4s battery setup? Without needing to change components on the driver?
Or is 1s still limited to 3v LEDs and 2s to 6v leds and 4s to 12v LEDs?
It can drive 3V LED with any voltage up to 20V, but this is linear driver,it burns extra voltage into heat. This driver is good when voltage of LED and battery are similar, like 2S cells and XHP50.2, XHP70.2.
In combination with mosX MCPCB generated heat in mosfet is not problem at all,since it's well cooled on mosX. Second generation of XHP50 and XHP70 have very low forward voltage, so they draw too much current with DD drivers which can lead to LED death or at least low efficiency because of too high current. Efficiency is equally bad in all modes that are derived by PWM of DD mode. Also 7135 regulators have max. operating voltage lower than 8.4V, so reliability is questionable when they are used in 2S setups.
This drivers provides constant current on all modes, so there is no problem with too much current on high mode, LED efficiency is max. possible in all modes. Disadvantage of CC method was extra heat generated in driver(mosfet to be precise) - that is completely solved with mosX board because mosfet is on same MCPCB as LED.
Are you planning someday to develop a buck driver, to run leds from a battery set-up with much overvoltage, like 2S for a 3V led?
Yes, but I have to have linear drivers too, they will always be one of the options because of small size and relatively low cost/Watt.
Do you have exact specifications for the thermal conductivity or thermal resistance of the insulating layer of the MosX PCBs?
I filled my Jaxman M8 with Led4power’s components, led driver mcpcb tailswitch and springs too. link to pics . By now most of my collection has at least something from this store inside, a good testament to how much I like the stuff but I’m going to have to try to do something different in my next build not to let things get too boring 
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I know dielectric thickness is 35um,dielectric conductivity is not specified directly, but based on some other numbers I calculated that it must be around 10W/mK.
So it should be equivalent to ~160um of PbSn solder layer thickness (I calculated this before as 200 something um,but that calculation was wrong).
Most of DTP boards have that order of magnitude DTP pad height variation, so performance in theory should be DTP-like for most LEDs, to check this I will do some DTP vs mosX tests for several LEDs.
Thanks. The central solder pad of the Osram Black Flat has an area of 3.06mm2.
So the thermal resistance of the insulating layer when using this LED is: 35μm / (10W/m*K * 3,06mm2) = 1,144°C/W
Add this to the 0.027°C/W of the aluminium PCB (1.6mm thick, 210W/mK) you get 1.171°C/W.
With 22W (maximum measured by Köf3, can vary quite a bit, I assume 80% efficiency) it thus adds ~20.6°C to the temperature of the LED.
Assuming perfectly even solder pad height a 20mm copper Sinkpad PCB would add less than 1°C (0,0147°C/W).
So while you're PCBs are a great idea, I agree with you in not reccomending them specifically for the Black Flat (most people use this LED at close to maximum power). Does your supplier offer other insulation materials?
I will test black flat also. Your calculations are correct, at extreme power densities even solder thickness and DTP pad flatness has great influence.
First test: XM-L2 (U4 bin probably) on DTP vs mosX
^ looks like the same performance.
Was it the same led reflowed first on the DTP board and then on the mosX board? What happened at ‘FAIL’ ?
POOF!
Two different LEDs from same tape, at 6A they died, I think this was known characteristic of XM-L2 U4 bin,besides extremely high Vf.
Nice, both PCBs are not limiting the performance. The Vfs are super high. They aren’t even good for 5A anymore.
Neven, when you come out with the e-switch driver, will you be able to use push button and e-switch like the LD2?
There will be separated e-sw and t-sw options.
Added soldered Luxeon Vs on various mosX boards, also variants without mosfet/NTC for direct replacement in many lights like Convoy triples and Emisar D4 quad :
https://led4power.com/product-category/leds/
All this good stuff, so little money left after Christmas! :person_facepalming:
I knew I should have waited some more time :person_facepalming:
But, I’m happy with my order, received today 
Thanks led4power!! Everything well packed and neat :sunglasses:
I want to make a correction on something I’ve said in the past about thermal protection triggering too soon on my E2L.
Yesterday I rebuilt it with new leds and in the process I noticed because a crumb of dirt got under the mosled pcb during reassembly, the board wasn’t making good thermal contact on the side of the thermistor.
So that explains why thermal protection triggered almost instantly (always less than 15s), and the driver heat management was working as intended all this time 
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After a more careful reassembly it takes something above 30s at 9A before stepdown with factory settings, which is in line with what I had expected in the first place.
I also melted the lighted tailswitch :person_facepalming: , but it’s not the switches fault, I think I might have damaged it during soldering of the spring as it always felt a bit too easy to click, and during a runtime test at 9A it just melted in place :weary: