KC1 keychain light is available now

E21A beamshot tint side by side please?
Mike

Great to know E21A is here but Hank I wish you got the E21A 2000K instead of the 2200k because the 2000K is 9090 whereas the 2200K is 9050. The 2000K also has less positive DUV so less yellow and the closest to natural candle light which is 1800K. The E21A 2000K also has the least blue wavelength of any LED I’ve seen and has practically no impact on your sleep/melatonin, attracts almost no insects for night time hikes and very little impact on night vision, so it serves some very specialized uses. I hope you can get some 2000K for your next order.

You can compare their parameters with Maukka’s spreadsheet.


Above link to E21 version is broken. Right one :blush:
https://intl-outdoor.com/noctigon-kr4-quad-e21a-tail-e-switch-18650-edc-flashlight.html

That looks like a good overall range of color temperatures to offer.

We should be able to get other CCT’s from Clemence once shipping returns to normal. Granted, swaps aren’t for everyone. This would also likely be one of the more difficult swaps, since the the KR4 has the aux board to remove and reinstall, as well, and E21A’s are reportedly harder to reflow than typical XP-footprint emitters.

By the way, I know Clemence’s E21A’s measured better than R9080 for the 2000K, but the Nichia datasheet does not list R9080 options for either the 2000K or the 2200K. I don’t know if the 2000K consistently turn out better than specified, if Clemence got a special batch, or if it was just luck of the draw. Regardless, I would not assume 2000K are easy to get in R9080.

However both 2200K and 2000K are rated R9050, there is no R9080 that is somehow could have been an actual option.
Besides, the amount of bins Nichia offers does not make them all equal, actually quite different, like any LED there are more than one bin for a certain CCT. So one example does not mean all are the same.

Despite the E21A 2000K is rated at 9050, the batches Clemence got always measured 9080 and above. I’m thinking it is consistent. The 16 emitters mule with the 2000K would make the perfect candle light with Anduril. I bet it would look so natural, you can’t tell the difference from a real candle.

I wish, but for his last restock a few days ago they didn’t have 2000K in same the flux/color rank as before, quote from when I asked him :

Why is E21A so special?

Why shold I buy this LED?

Which version of 4 available will you buy?

If having the highest CRI is your #1 attribute then you would want this. If you value output/efficiency/beam profile above CRI then you may be better served with a different LED, just depends on use case.

Color temp is personal preference but since he has a few to choose from you could combine them to make nearly anything between 2200K and 5000K

Hi Hank, do you plan to release a KR4 tailcap with lanyard hole? Like the D4v2?

Probably not since it comes with a lanyard clip.

And there is a lanyard ring comes with the light which many customers may not even be aware of.

Agreed.

To expand a little more on those tradeoffs:

The E21A can’t handle as much current as other options, so the KR4 with these emitters is limited to 5Amps (no FET), which produces about 1200 lumens (for the 5000K version). Other emitters that can run with a FET to current output can produce 3000-4000 lumens in the KR4.

The first sample of the KR4 that went out for review with E21A’s in it had visible tint shift with the stock optic. A frost optic mostly fixes this, although makes the beam wider and less throwy.

The efficiency of the E21A emitters is good for such a high CRI emitter. However, a low CRI emitter is capable of something like 30% higher output.

The frost 10623 is the default optic for the KR4 E21A version, instead of the clear 10622 optic.

Good choice. Thanks for the update!

sorry if the question had been asked before,Do emisar d4sv2 Ti will have e21a option also?

Thank you for your answers regarding E21A emitter.

Hank will the green and cyan d4sv2’s come back in stock, or were they a limited run

Hank, can’t the E21a be driven with partial FET, like the 219b?

Any plans to put E21a in D4V2 Ti?

Any plans to make a Ti KR4 with E21a?

Thanks for your time.

Hank, I never got a shipping notice for my KR1 order placed 5/28. Did they all get shipped already or have some not yet shipped? Thanks!