Amazing!
I've had trouble stacking 7135's and getting the light not to flicker, described in post #51 of this thread. I tried making a "linger special" with 2 XML's soldered in parallel onto the same PCB and driving with a 12 x 7153 chips. It was pulling ~ 4.2A (2.1A per LED), but the problem was I was getting flickering issues on all modes (high, med, low). I checked all connections and everything seemed to be visually ok, but it's hard to tell with the micro soldering. I was running with 1 x 18650, but also tried 4 x NiMh C cells. Less flickering on the C's, but was still not perfect.
The suggestion was made that I might not be getting good electrical connection at either the AMC 7135 stack solder joints, or where the 2 x XMLs were reflowed. No flickering issues with an unmodified 2.8A board, but output was not impressive.
If I could solve the flickering issue, I would be very happy.
