Iām sorry but a SST-40 6500K is not pure white. With a reflector you can easily see plenty of blue and purple spill. No doubt itās a great emitter but I think this āwhiteā tint assumption is way over hyped.
Cool, thank you for reminding me. I just purchased 5 sst20ās from kaidomain. Letās see if it gets here before the 10 I ordered from aliexpress.
Iām new to this led game. But from the relatively small amount of knowledge Iāve learned all signs are pointing to a the next rockstar LED.
I will test and report back to this thread. Ill do fet with a brand new C8 sofirn and fet with ut02. Iāll start with old pani laptop batterys then work my way up to a Sony vtc4a.
I also have 10 coming from that AE listing. I had been waiting on a response from KD, then just grabbed the AE after not hearing anything for a week or so. Of course KD listed them like the day after I pulled the trigger :person_facepalming:
I will probably order a few. The low Vf and (probable) high luminance dedomed make it a winner. The sofirn C8F triple might be a good match for this LED.
I got my 10 SST-20ās LEDs from aliexpress yesterday, so today i rigged up a DC-DC buck driver powered by 2 sanyo GA,s. Measuring Volts with a cheapo MM. Measured amps with a Uni-t clamp meter. And lumens with a lumen tubes I copied off of VOBās utube video(that has been surprisingly accurate).
The lead wires are very long, so Iām sure voltage sag is happening.
Here are my numbers. Take it with a grain if salt, or boulders of salt.
Thanks man. its no where near the level of accuracy you test at. Mcpcb is copper but not sure if its DTP. The mcpcb is what the leds came on from aliexrpress. maybe I should reflow them onto a Maxtoch and run numbers again.
Iāve seen your tests. You are great at testing LEDās. So Iām all ears. Any pointers would be greatly appreciated
For the re-test, this is what Iām thinking to change.
Reflow onto a known DTP mcpcb
Shorter LED wires.
? Put a reflecter on the LED ? Maybe a P60 SMO reflector.
Active Cooling.
I did the test fairly fast. As soon as I wrote down the results I raised the input,not allowing it to cool. should I wait and allow the LED to cool down.
Iām almost certain if I retest Iād get higher lumens, but higher lumens is not what I want, I want to be more accurate in this re-test. Either way, Iām fully open to recommendations.
Yeah, too bad, but maybe there are other benefits like a better tint after de-doming, easier de-doming or similar. Itās actually quite interesting that itās not any better since the SST-40 is so efficient and has such a high max.
It is all relative. When I started led-testing I was in awe of BLF member āmatchā who had made an actual integrating sphere. He disappeared from BLF and then I found that someone should continue testing leds so I started with ceiling bounce led tests with a crappy luxmeter. And those simple tests were really valuable for modders compared to no testing at all, as is your test now. I refined things a lot over the years to get more accurate results but that is more for my own fun than that those more precise data have become so much more useful.
And now Iām in awe of maukka and Koef3 who clearly made test rigs more advanced than mine
One test of one sample, of an unspecified bin, from one AliExpress seller doesnāt seem to justify the conclusions being reached here.
The datasheet shows a range between low and high bins of ~1.6x.
Iād at least want to see how the SST-20s that Kaidomain is selling stack up.
Also, FWIW, there are copper 20mm non-DTP MCPCBs for 3535 LEDs out there. I got one when I sampled the MCPCB offerings of a similar but different AliExpress LED seller. The 5050 & 2x2 array of 3535 emitters I received from them are DTP.
Knowing it is from AliExpress I suspect (or hope) it is a non-DTP MCPCB that caused the poor performance. It really seems like we should expect analogous performance to the SST 40.
For what itās worth I will test the ones I get from KD when they arrive.