[1900k edition is in!] WTS: 1900k-5800k 5mm LED 95+ CRI

Action Halloween projector, 0.69 Euro

Kudos to iamlucky13 for the suggestion of using 2AA direct drive for a 5mm Yuji.

No PWM, no standby drain, no soldering required for 5mm LED swap :+1:
Current somewhere around 25mA with 2 “newish” 1.5V alkaline AAs.
Mod with Yuji 3200K LED.

Q.E.D.

Mine arrived today, thanks!

I did a voltage and output test on one of these 3400K 95CRI leds, and it does not disappoint, output is better than the Yuji, voltage is lower, and it can handle more current. The max is about 22 lumen at 100mA, going higher up to 120mA gets you a bit more light for a moment but it settles back to 22 lumen again within a couple of seconds. My test rig for 5mm leds is not great, the current can not be set very well and the graph shows it, but the output numbers are correct. I also re-tested a 3200K Yuji for direct comparison. This new tested Yuji has about 1 lumen less maximum output as the one I tested before, but apart from that the voltage and output curves are pretty much the same.

Also I have been running one of the 3400K 95CRI rngwn leds all day at 100mA, and it does not seem to bother the led much, output does not degrade, steady at 22 lumen. It is not quite a 50,000 hour test but it does tell something.

Edit: there seems an effect on tint though. I should do another test for confirmation but the led seemed more yellow and when I measured it again, the duv, that was –0.0038, after 12 hours at 100mA it went to –0.0007. CRI is invariably good.

Here is the tint data at 50mA, I also measured at 5mA and that is a bit better even but only marginally

I also measured tint in the warm edge of the beam, CRI is the same but in 2800K. The CCT has some variation apparently, the first led last week measured 3320K, and now 2 leds measure both at 3200K.

(the bottom leds are two of the 3400K 95CRI leds from rngwn, top left is a Nichia GS, top right are a cold and warm Yuji)

My LEDs have arrived - thanks, rngwn!

Now I’ve seen those test results, I’m really glad I bought some :slight_smile: Thanks for the testing work, djozz!

Thanks for making measurements for us djozz. I’m impressed how well this LED performs - not only more output and able to be driven a little harder, but also a lower forward voltage than the Yuji’s. Taken together, that means 20% better luminous efficacy, which would be great in lights that use boost circuits like the C01.

And very similar color. I looked up your spectrometer test of the Yuji’s for comparison:

I took the liberty of summarizing your two samples:

Yuji 3200K rngwn 3400K Yuji 5600K rngwn 5800K
CCT 3162K 3237K 5390K 5666K
Duv -0.0037 -0.0038 -0.0004 0.0010
CRI 96 96 95 98
R9 84 84 94 93
Output, 20mA 6 lm 7 lm 7.5 lm 9 lm
Vf, 20 mA ~2.9V ~2.8V ~2.8V ~2.9V
Peak Output ~14.5lm 22lm 22lm 25lm
Peak Output If 80mA 100mA 90mA 120mA
Peak Output Vf 3.6V 3.3V 3.25V 3.45V

(1) Yuji color tested at 20mA? rngwn sample tested at 50mA
(2) Maukka C01 average of 2 samples

* Edit - added Duv.
** Edit 3/24/23 - Reformatted table to appear properly on new forum software.

Thanks rngwn for finding these and setting up the thread to sell them.

Great to see this test results Djozz. This LED looks like a fine replacement for the Yuji.

The Yuji color is very special, probably second to none. Still rngwns LED is much more useful imo. Very bright in contrast with an evenly distributed beam (beamshot added in posting #102). Really nice. In the Fenix E01, it clearly outperforms the C01, but maybe the Fenix has a higher current driver.

unheard, nice work making your E01 much friendlier. It’s the perfect form factor for this time type of emitter.

(edit - corrected typo)

Enjoy casting silhouettes on the wall in warm, high CRI!

Interested from Spain in two packs , send a PM

Thank you :slight_smile: . Yes, the bluish light had to go.

Thank you @rngwn . :+1:

Got my package today, just in time for my new idea…. :person_facepalming:

Thanks, rngwn, it would be almost impossible to have 5 mm LEDs with high CRI if it were not for your offer, greetings

@rngwn please see PM. Thanks!

^ Shipped, tracking in #101

got my LED’s thanks rngwn!

Boy, these are way too warm for me but thanks for offering them!

If you want 5600k and you live in the States. This guy right here has it.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F123534597805

Got my samples. Direct driven, i.e. no electronics. The PCB can be taken out by pushing the LED. It just falls apart. Piece of cake to replace the LED, but maybe not worth it. Body must be some kind of zinc alloy.

The Mateminco BL-1 is much nicer. I ordered the copper type, and it appears to actually be made from copper! Hope I can take it apart.

Nitecore Tube would be suitable for this led?

I don’t think so. The LED in Tube is most likely driven at 150ma. Unless you find the way to cut the current in half, I don’t think think this LED will survive.