I got this emitter from Kaidomain on a 20 mm MCPCB.
Mounted on a CPU heatsink with a nice splash of thermal paste and over the top 16 AWG wires.
Exact order and bin code: SST-20-WCS-A120-L2651 VK BA
A=solder pad configuration (3.25 x 3.25 mm)
120=viewing angle, 120°
L2=flux bin rated at 85°C, 530-560 lm at 1500 mA
VK=forward voltage bin, 2.9-3.1 V at 1500 mA at 85°C
BA=tint bin, 6500-7000 K at the BBL
CRI data measured from the hotspot with a Reylight Pineapple OP reflector.
At 500 mA
At 1500 mA
At 3000 mA
At 6000 mA
The tint changes rapidly on lower currents, but after 1500 mA the change isn’t so sudden. My sample seemed to be perfect at about 3000-5000 mA. The tint gets progressively cooler above the peak at currents >7 amps. This was my only sample so I didn’t want to kill it.
Without a reflector straight on the output is very cool and purplish. Also, the tint shift is very strong. This LED has to be used with some sort of reflector or optics. Measured at the rated current of 1500 mA.
Beam tint tested with a variety of reflectors and optics.
Best results with regard to tint shift achieved with a small reflector and a beaded optics, which was to be expected. The larger SMO reflector was not bad at all so it’s very much possible to make a throwy light with the SST-20-W. The 5° clear Yajiamei optics produced the most artifacts/rings.
Output measured in a 50 cm integrating sphere