The single, accidentally de-domed MTG2 I have still had a bit of silicon on top of the LED. Out of idleness I sanded it flat yesterday (with a dremel— yeah, not too bright) an decided to test it with a LiFePO4. Only half the LED it up dimly (<0.2 lumens). I poked around with the battery connected to a wire and couldn’t get the dead half to light up at all so decided that since it was already dead, I may as well scrape off the phosphor from that side and poke around even more.
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Well, while prodding the exposed die with the negative wire (still using a single LiFePO4,) I touched somewhere and the good half of the LED light up full power! :cowboy_hat_face:
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Sorry, I haven’t taken a pic of the exact spot as yet. For now, I can only tell you that it is just at the end of the die iteself on the negative side. A very small spot so it may not be possible to solder anything to it.
Nice! If you manage to light up a circle and use it in a reflector based light I wonder what the beam will look like!
do you mean half circle? lol. I definitely would try finding that connection point and soldering a wire to it. Stuck at work now.
Here are a couple pics of a MT-G2, that MT-G2 is deffinetly an interesting emitter.
I was thinkin more of a ring LOL
I wonder if it’s 2s36p very small die LEDs.
Bingo. 
YES!!! Pics coming!
Tried separating the 2S -ve input from the rest of the LED. The copper seems to be thicker than that of a PCB ( there was no separaton) :
The 1S input is the ‘D’ shaped part:
Testing with a safety pin (which shorted to +ve accidentally hence looking black. lol):
Giant blob of solder (flux didn’t seem to help and the LED got so hot it shifted a little on the star so I just put a big blob and hoped it would bond.):
Smoke is no good:
SEE:
Bending away solder from phosphor: (Solder didn’t bond to the LED. Grrr. )
After scraping away some of the burnt stuff. As can clearly be seen, 6, 8, 10, and 12 LEDs (36) on the functional half.
With a panasonic 2900mAh, 10A something at 4.18V open circuit voltage (OCV), current draw DD is 4.10A (same with unknown laptop pull). With a new LG,HE2 at 4.16 ish volts, DD current is 5.10A.
Cool info. I wonder if it’s possible to separate the two circuits and run them in parallel instead
Agree, i have been wondering if cree’s multy die leds MT-G2, CXA, CXB could somehow be modded to run parallel and from a single cell. And now it seem it could be possible it this makes me wonder if it possible to do nondestructivly though 