srvctec - great pics and description, thanks.
You're welcome! I can't even leave new stuff alone if it isn't the way I want it.
I better don’t ask for the purpose of a titanium split ring. 
Lol, wanted to have a closer look at the “spotted” LED in my KR1. There is one of these transparent o-rings between the head and the bezel. Yeah, these crappy ones that break easily. Mine got stretched pretty badly and it wasn’t easy to screw the bezel back on. Probably not water resistant anymore. Maybe it’s time to order a bigger set of o-rings…
There were some splatters of flux all over the MCPCB. And I found some tiny solder balls. Quality control could be better.
Btw, Hank offered me a replacement MCPCB. 
I think I can live with that and for Hank it should be more cost efficient than everything else.
Beauties:
D4V2, SST-20, 3000K, KR1, XP-L Hi 5D, 4000K
The color of the KR1 isn’t show correctly. It is a desaturated cyan, probably a color that cannot be pictured well digitally. Love it.
I have read on another thread that Hank offered to custom-build a D4v2 with Luminus SST-20-DR (deep red, 660nm). I would be highly interested into something like that in a KR4 but I wonder how four of these LEDs will cope with any of Hank's drivers. I would prefer hardware-based current control instead of a custom-coded Andúril version.
hows the surface on the KR light is it smooth or rough ?
Neither. It’s a little bit rough, but very fine.
Yes, we have customized this LED in the KR4, KR4 driver can be fully regulated without direct drive.
That was me.
Hank built this flashlight for me a couple of weeks ago and I actually have it. It works well and it is fun to play with. It doesn’t even use a custom version of Anduril (AFAIK). SST-20-DR are rated to be driven at up to 3A, same as white SST-20. Obviously they will be overdriven in a D4V2, but it seems that they can handle it. I use 100% turbo a lot and it has not killed the LEDs yet.
I wouldn’t worry about it; if you want a custom KR4 with these emitters, just order one, it will work just fine.
It’s nice 
That's great. I will send you an e-mail right away to also get such a custom light. :LOVE:
Thanks a lot lightdecay! I will be happy to place my next order at Hank's shop. If only the long waiting to get this light could be skipped...
Ask Hank if he can ship to your location with DHL. It could be a lot faster.
Thanks to you guys I just placed another order via e-mail for this custom KR4 with SST-20 Deep Red (660nm) and another KR1 with W2.
Hank already replied - wow, that's fast. These new lights will greatly fit into my Emisar collection. :-)
If I recall correctly, all my orders from Hank came delivered by DHL anyway. However, fast shipping is always a good thing.
It's nice! Hope this helps. There are some really fine grooves machined in the body.
I made a quick video comparing beamshots of the W1 KR1 with the BLF A6, Emisar D1 (SST40 5000k), Emisar D1s (6500k) and Astrolux FT03 (XHP 50.2 5700k)
So it’s not a custom driver? Same D4v2 driver as other SST-20 lights with direct drive on turbo?
If I interpret Hank's answer correctly, he probably uses the new regulated (5A?) KR4 driver in D4v2 to use SST20DR.
I don’t think that is the correct interpretation, his post does not mention D4V2 at all. I think he is saying that he previously built a KR4 with SST-20-DR, and that it is possible to disable direct drive on KR4 driver, but he is not saying that it is needed for this LED.
My D4V2 does not have the KR4 driver.
- Hank would have told me if he needed to use a different driver, so that I would know which firmware I needed to flash when updating.
- My flashlight blinks during ramping at the transition from 1x7135 to 1x7135 + FET, and button LEDs become brighter, exactly like my other D4V2s.