I have a couple of these high power Epileds 5050 colour leds from aliexpress in house for six months now but never came round to using them. I did an output test on a red one (I posted it somewhere I think) and a pink one (not posted yet but it was a lot of pink!), and now I found time for a test, and mod, of the Golden Yellow version. It is sold as a colour led and not sold as a low colour temperature white led, but they do state a colour temperature of 2000K. And it is clear from the appearance that we have here a phosfor-converted blue led so the width of the spectrum peak could be wide enough to actually show some CRI.
At least the output is solid, as expected from a converted blue 5050 led. Method as always, see for details my earlier white led tests.
It is a very usable led actually. A nice low Vf (lower than an XM-L2) good output, and the led lasted up to 9A. It died at 9.5A with some epic damage, not even the bond wires burned but a whole section under the phosfor went black:
I had a Q8 that was in between leds, it was converted to a lantern but I think the BLF lantern will become much better so I built it back to a flashlight and put four of these yellow fellows in there for the time being (I hope for high CRI SST-40 leds to come out at some point). To fit the 5050 leds I used a led4power Q8 board with the 5050 pads, made a clamp for it because the board-screws could not be used with this board, I reamed the 4 reflector holes from 6.2mm to 6.7mm so it can fit a standard XM butterflyshape centerpieces, and I used a Kaidomain 55mm coated lens.
Although the springs on this Q8 were not bypassed and the led wires were kept long and just 20AWG, I first expected that the current would be too high on high-drain cells, but after some trying out I got 14.3 A on fully loaded VTC6 cells, which is quite perfect for these leds, they run at 81% from max.
The output that I measured is 3500 lumen at start, 3300 lumen at 30 seconds. A lot of yellow that is! 8^)
From the balcony it makes the complete square looking yellow. First shot is control, next the Yellow Q8 at max. The big trees are at 25 meter but I can see the end of the square at 100 meter turn yellow as well when aiming the hotspot.
When measuring the tint of the hotspot (the brightness does not matter much, even the spill measures the same as the hotspot) it even has an acceptable CRI of 64, with a CCT far above the BBL.
That was fun, thanks for reading
Edit Jan20: I added a test of a pink Epileds 5050 led in post #18.