Nice! That’s right around where I’d expect it too. My SRK with XM-L2 U2 1C on copper SinkPADs pumps out around 2800lm at 2.8A/emitter. Seems right around on course, considering my setup (the integrating box says “keep frozen” on the side 
).
when do i get to buy a board/kit/etc? 
:bigsmile:
Well this is awesome. I was going to build my own driver using the master/slave NANJG 105C setup, but this might be the way to go. I actually started designing a circuit board on some site, but I had no clue what the hell I was doing :)
You have to be pretty damn big to need a SRK for a piss light. And really, if that is the case, you’re probably wanting more throw than flood.
J)
Sky Ray Kung. 
It appears that the OP has been updated since I first read it. This sounds like it is shaping up to be a real nice driver board and firmware. I sure hope you will be selling these.
I think that the best option for a Kung driver (for now, at least) is to add an external 8xAMC7135 board for the 4’th LED. The SRK driver board only has room for 24 AMC chips (8 per LED without stacking chips). A Kung specific driver would have 6 per LED without stacking.
OSHPARK has said they have shipped the new layout circuit boards. Should be here in a couple of days.
For the Kung we could stack 8 and parallel the the 3rd and 4th led to the double stack…that should work…or am I wrong?
I need one of these for a de-domed XPG2 SRK... let me know where to send teh munniez. $)
Updated the first post with some testing info on a real board…
Nice. The Kung needs a automatic turn down mode at a certain temperature to make it useable: when I’m using it I constantly have to switch to “low” so as not to continue slow roasting my hand. Maybe efficiency modes could be good: you could designate a max temp range and light automatically lowers when it gets over this range, increases when its below the range? I’m just throwing ideas out there, ignore if they are not doable/reasonable.
That is one great driver for a light I do not own 
. (but now I finally want a SRK, with this in it)
I can't believe it goes from 0.25 to 2600 lumens.
BTW, with 4 x 2500 mAh cells in the light the 10 uA parasitic drain will drain the batteries in 1 billion hours… over 100,000 years. :party:
any chance this can be scaled down to fit the SRM (Sky Ray Mystery)?
where do i send the monies for the board/etc!!! just read the feature list again and im excessively excited.
Brian
Why dont we start a Kickstarter or Indiegogo to crowd source enough funding to get these boards made?
I would happily contribute a nice chunk of change to see these things be made available.
I’ve done some testing on the thermal throttling code. Originally I had let it adjust the PWM up or down based upon the temperature, but this caused some problems. The temperature reading would bounce up and down a degree and the shifting PWM level would causing the light to flicker. I now only let the throttling go downward.
At the full 9 amps the case temperature reaches the 44C step down threshold after 1.5 minutes (the driver is about 9 degrees C above the case temperature). After around 10-12 minutes the light has stepped down about 50% and the temperature no longer rises. If the case reaches 60C the light shuts off completely.
Also, after doing some of the thermal torture tests, the Vf of the LEDs has shifted enough that they will no longer light up at that 0.25 lumen firefly level. It looks like the dimmest it will reliably do is around 6 lumens.