Thanks for the test. Nice LED for those lumen hunters.
That is interesting about the higher current-handling ability. I thought this is basically the same as the white flat but with different phosphor? So the chip and thermal path down should be the same. Could it be that the white light phosphor produces a lot more heat than the green phosphor and that is the source of the difference?
Strictly it is not a green led and the light looks different too. But if that is not relevant its luminance is higher than anything there was before, including all white leds.
White flat and "Green" flat have the same thermal resistance, so max. currents should be similar, green flat peak could be a little bit higher (0.5-1A) due to higher efficiency and lower phosphor loss.
So I think this confirms your white flat test was probably with sub-optimally reflowed LED since I got 5.75A peak, almost 1A higher than what your test shows.
Yes, I considered that. Funny thing is that this time the reflow was done with less care (more solder) than with the White Flat test. So I do not rule out that this difference is real. I may re-do the White Flat test although it is less fun to re-test stuff than something new :weary: (and it costs me another led, ).
How about this: I'd like to send you 9 LEDs, 3 soldered by me, 6 bare + 6 3030-20 DTP boards + small amount of lead free solder. You should solder 3 LEDs with your lead paste, and other 3 with my lead free paste.
So you could finally test lead vs. lead free solder,and also see if soldering technique has any visible effect, white flat is best LED for that test since it has smallest thermal pad (3x1mm) and highest power density (W/mm2).
3LEDs for each test is to eliminate "luck" during soldering and LED thermal resistance variance.
That is quite a few hours of testing but it sounds like that will generate some useful data, let’s do that. But we can not set a hard deadline for this, having a family, and with always the possibility for the need of extra care for my son, my hobby-time can spontaneously evaporate at any time, so things must be postponable.
Looking at datasheets, two graphs (output vs current and output vs temp) also show that green flat looses output slower than white flat at higher currents and higher temperatures, which is in agreement with djozz' measurements(left white flat, right green flat):
One interesting thing is green flat output reaches max. at ~40-50C, but it's only 1-2% higher compared to 20C.
Green flat is a little bit closer to 2.5 than white flat, difference is small, temperature has much more visible effect, at 100C white flat is at ~89%, green flat at ~94%.