This is the newest 365nm led that the Convoy aliexpress store has for sale, although it has been on the market for at least 2 years, just not affordable for private buyers until now. Simon only sells it already reflowed on a 16mm copper DTP board and that is how I tested it. Unfortunately they (I ordered 2) were extremely dirty, so I had to do extensive cleaning of the die (tissue and isopropanol) before I could start the test. Here’s the two boards that I bought, the left led I already cleaned for the test. (It is not competely clean, I wished Convoy sold the bare led in original packaging)
Compared to the previous LG 365nm led that was for sale on the Convoy store, which was already among the top performers of the 365nm leds that I measured sofar, this has a bigger die and promises more output. Let’s see. Here’s the new LG led compared to the previous one, for the picture they were wired in series so they receive the same
( <50mA) current:
I used my 2017 method for measuring output, deriving the output indirect by measuring UV-light induced fluorescence in uranium glass. I defined a unit called djozz-mW that allows me to compare different leds and has hopefully some relation to the actual radiant power. This being a rougher and more indirect method, do not expect the accuracy of my white led tests. For details, see link.
The output is a bit better than the former LG led but seeing how much larger the die is I expected a larger difference. But what is more relevant is that this led has almost 0.3V lower voltage at the interesting currents. That makes this led clearly more efficient than the previous generation, and easier to use in current-regulated flashlights.
The surface brightness of the die in his new led is actually a bit less than the previous generation: the limited higher output does not make up for the much larger die.