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:
Wow how’d I miss these? Those silicone pads are sweet! :+1:
That's actually picture of aluminum spacer in pill, thin silicone pads go on top and bottom of spacer.
That is good example why is good to have temp. sensor on MCPCB instead on driver PCB - in other case driver don't see that something is wrong with PCB contact and LED would probably de-solder itself together with wires which would cause havoc inside of light.
OMTEN switches are unfortunately made from low melting point plastic, so soldering everything around switch is more challenging.
As led4power said, it is an aluminium spacer I didn’t put the silicone pads as this was for “demonstration” purposes only, when the products arrived!
But this is top notch! Super well made
BTW, I’m using one of the the Luxeon V (with pebbled TIR lens) …and, honestly, it is the best tint I ever seen!!! Honestly!
So thank you I guess now I’ll have to try the triple with those leds :person_facepalming: :sunglasses: