Look in the Convoy store on AliExpress.
There is a 3 mode buck driver there, and could well be resistor modded without heat problems to 4 - 4.5 Amperes.
It is a double PCB diver, but no parts on the bottom PCB.
I think it’s around $ 6.
Danke @ The_Driver! 
Bedankt @ Jerommel!
Complex little driver! I just put a 6A LD-A4 in an Eagle Eye X6 host that came in today. I soldered two 20mm copper boards together for height, used a 35mm TIR with a deep narrow “cup” over an XP-L HI and connected these with 20 Ga Turnigy leads. Set up for 5A, with 4 levels and moon mode engaged it works pretty nicely.
The large TIR will show it as unique, the LD-A4 guarantee’s it. 
Where did you buy the TIR for X6? can you give the link please? Thanks Dale.
I honestly have no idea. It was in my kit, appears to be new, was in the black plastic holder and I had to remove it to fit into the bezel of the X6 which was a little tricky. Works pretty neat…
Was it from Justin?
I have bins and bins of bits from Justin, as much or more than what I already had of my own. His stuff and my stuff together makes for a LOT of stuff! I can’t remember my own purchases, still finding things in his stuff that I didn’t know I had.
Y’all just can’t know, it’s like he’s here with me all the time. 
Bittersweet, at times. Uplifting in other moments. And so it goes…
Hahaahaaa thanks anyway Dale. Wonder if it’s one of the Kathod optics or not…
Straight, no spacer?
Its taken me awhile to remember where I used a similar optic. Justin sent me the optic. Cant remember the diameter but thought you may have used one in your mod.
I think that optic might be Ledil Iris, if it’s ~38mm. Doesn’t look like Khatod PL1672.
Edit: measured actual Ledil Iris optic at 35.0mm. 38mm includes the holder diameter.
I received the KW CSLNM1.TG leds today. I will do an output test one of these days (if maukka or Koef3 do not beat me to that 
), but for now I measured tint at 0 degrees, 30 degrees, 60 degrees.
0 degrees: 6100K on top of BBL, CRI 68
30degrees: 5800K creeping up above BBL, CRI 67
60degrees: 5300K going further up, CRI 65
WAIT! Dots? Are these some kinda micro-COB emitters or something? Won’t those tiny dark spots make it challenging to get max luminance in a thrower?
Same as the black flat, not any significant variation when on high power.
Completely invisible after all the imperfections on optics.
Thanks Enderman!
You’re welcome
The “white flat” looks so pretty
Thanks Hoop, nice info.
Can’t wait to get mines !
I forgot to put my old test results:
I calculated/estimated lumens from my lux numbers and datasheet bin specification.
Yellow marked lumens calculation are based on old black flat measurements at 1A as reference (made by koef3 I think), non-marked lumens are based on ~middle of bin lumen number at 1A from datasheet (330lm, actual middle is 335lm).
Using yellow for calculations….
If this emitter really has 1.0609 mm² and 952 lm we’re at 285 cd/mm².
Note that according to package drawing in the datasheet this LED is 1.0609 mm² minus rounded corners.
Also note that the Blackie HWQP while nominally 1.0609 mm² minus cut corner was measured at 1.12 mm².
I tried to measure the size based on djozz photo, but haven’t really arrived at satisfactory numbers…
Assuming that it actually is 1.0609 mm² it is much more efficient than the previous generation (in terms on intensity vs. efficacy). I’m really anxious to see a Koef3 test where I can compare it with the competitors directly…