It is my day off so I had some time. I tested the 5000K SST-40 that I retrieved from my Wildtrail D80 V2, on its own Palight 20mm DTP board. So I did not do the reflow myself and trusted on Wildtrail’s reflow. The rest was standard procedure. I did not make a nice comparison graph, but it is easy to get the picture.
So the bond wires blew at just over 9.5A which is not much different from my test 2.5 years ago (link), and from what koef3 found in the OP of this thread.
The voltage curve is almost exact what I found for the led that I tested 2.5 years ago.
Further, I now found a maximum (2300 djozz-lm at 8A, mind that this is a 5000K led as opposed to the 6500K led of the previous SST-40 tests), while the earlier tested SST-40 leds kept increasing output until the bond wires gave in. It can be a bad reflow by Wildtrail, but my feeling is that it is real. In the picture below you can see, apart from the toasted bond wires, that the dot pattern on the phosfor is different from the original SST-40, so Luminus gave the SST-40 quite an overhaul, which may just have influenced overcurrent performance.
