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

Came here to confirm receipt of my latest LEDs and…

Ooh, 5000K LEDs! Paypal sent :slight_smile:

I warmly recommend buying from rngwn, he packs his stuff well and ships it quickly. Both of my packages came from Thailand to Scotland in 10 days flat, with all LEDs in perfect condition.

Thanks very much for making these rare LEDs available to us, rngwn :+1:

You also have Royal Mail’s (relatively) efficient handling of mails to thank for that.

Just checking in to say I received my shipment on Jan 31, About 10 days to reach California.

My first time trying the 2300K, I am so glad I finally ordered these!!! Perfect extra warm color temp for candelabra, night lights, etc. and preserving your melatonin levels at night.

Thanks so much for offering these little gems!

I got my LEDs today and played with them as soon as I could rig up an ATtiny85 project.

The: LEDs, shipping, packaging, and service were all top notch.

The price for quality of special binned emitters is unbelievably affordable.

I see some LED strips with 5mm LEDs. Would be a nice swap target. :slight_smile:


You always find the weirdest stuff, Argo. :+1:

(yes i’m back from France again)


As per postal service’s announcement regarding Coronavirus, I will only be able to ship to Mongolia (if somebody happens to live there) using Express service until further notice.

Mongolia goes high CRI!

But that is quite a bummer, I hope for your undertaking that the virus will be under control soon.

Shoot. I worded that poorly once again.

Shipping to other countries (except China and Mongolia) are still fine as of now.

I obviously can’t (and probably won’t) ship to Mainland China and Hong Kong. Taiwan is still fine.

Regular (Ordinary/Tracked) shipping is unavailable for Mongolia.

Ah! :+1:

Just received my order,and I am now using one of the 2300K LEDs in my 30 year old Mini Maglight incan. The tint is fantastic.

Thank you very much rngwn, what a great find these LEDs are!

I promised rngwn several weeks ago I would do a destructive test on some of these LED’s. I’ve been very delayed due to life being busy. However, I did this week finally have time to load ceilingbounce on my wife’s old smartphone and do one test on a 2300K sample.

It ran at 150mA for several hours before I had to stop the test because I couldn’t monitor my sketchy setup any more for safety’s sake. When I let it cool down and restart, it was still nearly as bright as at the start of the test. I was surprised it survived longer than 30 minutes!

I think the test is unrealistic, however, because at only 1/2W, even the legs provide significant air cooling. To better replicate a flashlight, I plan to repeat the test with the legs trimmed short, and the LED facing vertically so convection is more limited. Depending whether it dies quickly 150mA, or shows no signs of dying in a reasonable test duration, I will repeat it on another sample at higher or lower current.

Hopefully I will have results this weekend. These are really nice low power LED’s for tinkering with, so I think it is good for the community to have reasonably accurate information about how far they can be pushed.

I think I misunderstood the answer to a previous question about this.

Is that PCB the guts of one of the Ikea lights? If you swap in an rngwn LED, does it still flicker?

The tea lights my wife has do not have any dedicated controller. The 5mm LED itself has some sort of internal flicker control. If I replace the LED, the tea light no longer flickers.

I want to replace the monochrome amber LED’s, but not lose the flicker effect.

The 2300K LED’s significantly outperformed my expectations when abused. I trimmed the legs so there would be no excess exposed to the air to help cool them when inserted in my solderless breadboard, then hooked them up to bench power supply while recording output with Ceiling Bounce.

I was hoping they’d last 30 minutes or more at 150mA. Normal specifications for a 5mm LED are 20mA rated and 30mA max.

After 12 hours of gradual decline, I stopped the test, let the emitter cool down completely, then started it again. It restarted at 80% of new.

Given that excellent performance, I tested a second sample at 200mA. It took 10x rated current to actually cause relatively rapid damage. After 6 hours, we were finally down to about 10. I let it cool down again and it restarted at 18.5 of it’s initial peak. Forward voltage declined by about 0.2V over the course of the test.

Keep in mind that your results may vary, especially if they are allowed to get hotter.

I’m including 2 graphs of the results. Ignore the noise in the 150mA test. I’m pretty sure it was a setup issue. Please let me know if the graphs don’t display properly.

As a baseline, here’s djozz’s output measurement.

Nice data! These can for sure take some abuse.

Thx for the test!

Now i love my stash even more :)

Thanks for the test. :slight_smile:

Picked some up a while ago and they look great. Work very well in old mini-mags! I’d actually be very interested in a narrow beam version. I have some photons and some Gerber IU’s that are just begging for a high CRI upgrade!

As far as the situation goes, I only have 19 countries left that can be shipped through regular postal service. All these remaining countries except Russia (and China) must be shipped to via Surface Mail (2-3 Months minimum).

Alternatively, there’s DHL service still available for most countries. The shipping cost for that is from $35 to $100 varying by countries.

Thank you for the 2300K test data. We know that the these flea powered LED’s won’t last too long at 150mA. I would be interested in knowing what the max mA they can handle with no degradation in output for maybe 100+ hours. No joy for me in toasting these little gems. I’m guessing a safe limit may be 75mA or so? For night lights and candelabra the 5-7 lumen range is good, if I need more from them I would add more LED’s.