Well, Lexel pointed out the LED's are 3 sets of 2S3P, so has 3 pairs of wires, 3 separate circuits. So either there's a component failure or maybe loose wire in one of the 3 sets of parts and wires.
Not a loose wire as all 3 banks work at the other 4 levels. I’d look over the driver with a magnifying glass to see if a resistor or some other part was burned or not soldered properly. I don’t know if it uses 7135 current chips, but if it did, it could be a bad one of those on the bank that doesn’t work.
Lexel - is the MF01.ZIP board a go, and tested? It looks dated August 27th on OSHPark here. I see steel_1024 used an earlier version - seemed ok, not sure.
On Lexels 4th batch page he says he can make them. One other person wanted one, but I think he was looking for at least 3 buyers for Oshpark, because he has to order 3.
No, not interested in an assembled board. Been building dozens of my own, ordered probably about 100 OSHPark boards by now since February 2014.
I've had issues on the 7135 channel on my other high amp 2S cell builds: 16X XHP50 and MT03 with 3 XHP70.2's. Not completely resolved, been getting help from DEL. Dunno if Lexel has built anything true high amps in 2S, meaning maybe 20K lumens and up.
I’ll figure out myself as well. I’ve got two of those coming my way. Interestingly, it still doesn’t feel like a bad purchase; the price is just too good to take the risk, unlike with an Imalent DT70.
Ironically, four pieces of 5000 mAh Ultrafire cells seem to be able to power a 20000 lumen Ultrafire Skyray King clone, so 12000 lumens should be no problem….