Definitely a lottery. I got a couple good ones (they’re cool white but neutral tint) when they were first appearing. Several months later I bought a few more and they were all ugly green.
I hate throwing money away on unknown emitters that more often than not turn out to have bad tints. I’m no longer interested in any chance of a tint lottery. I’d happily pay a premium for known good ones if anyone offered that.
These mystery emitters can be fun but I’m going to stick with established products from now on.
They also have this one, with lower lumen spec. Can you confirm that the ones you got have 4 or 5 bond wires? And if the black dot is present?
Edit: maybe share a closeup picture if you can.
Thank you. It is indeed the 4 wires one from the link you sent (5500K - 6000K). I asked because they send the wrong emitter very often.
Edit: are you using it with linear or buck driver? What is the relative brightness between 30% and 100%? (you can measure using opple with the flashlight ceiling bouncing).
@1stein Is it possible to send one of these ‘95 CRI’ samples to me so I can measure it in my sphere? (The LEDs you linked are not available in Germany from this seller.)
Edit: What strikes me about the picture with the LED in the reflector is that the phosphor looks much more orange than is the case with an LED with low color rendering. The luminous surfaces of my ‘Yinding 5050 glass’ in 5500-6000 K are clearly more yellow-green than the LED shown here.
Although the Opple is not exactly the most precise piece of measurement technology, I think at least 85 to 90 CRI is realistic. Let’s see if I can determine the luminous flux characteristic so that I can compare it with the 70 CRI version.
I’ve also checked my Opple3 against other leds and it seems to be working as usual - readings quite consistent with the specs. So I’m really curious what kind of a trick is this.
