KC1 keychain light is available now

3Amp is the safe maximum for an extended period of time as tested by Clemence and others last year...

Let me share my findings with my DM11 (B35AM 2700K, 6V/3.6A driver).

  • Temperature Limit = 70°C, with enough cooling applied, from off to Turbo: no thermal regulation is triggered, however the self-protection of the boost chip is triggered after ~20 seconds (the light blinks, the higher the temperature, the faster it blinks so as to reduce the temperature).
  • Temperature Limit = 60~70°C, no cooling applied, from off to Turbo: the self-protection of the boost chip is triggered before the thermal regulation reduces the output effectively.
  • Temperature Limit = 50°C, no cooling applied, Turbo after a few minutes of use: the self-protection of the boost chip is NOT triggered, however thermal regulation happens very soon (~5 seconds).
  • Temperature Limit = 50°C, no cooling applied, from off to level 140/142/150 (which are about 75%/80%/100% energy of the max output, respectively), the thermal regulation works as follows:
  • Therefore, I personally believe level 140 is a more reasonable max output one should use, since higher levels give quite few gain in lumens but much more heat and really shorter usable period.

  • I also tested the accumulated runtime of level 140 and 142. This kind of measurement is done by turning from off to that level, applying cooling, and turning the light off when thermal regulation or the self-protection of the boost chip happens, waiting until the light is completely cold, then start again.
  • As shown above, the difference in brightness between level 140 and 142 is NOT noticeable, but level 140 runs much cooler and sustains much longer before thermal regulation or the self-protection of the boost chip happens.

Can i take the boost driver on a 519A D4SV2 ?

Yesterday I ran a couple tests and found that level 140 did not cause smoking to occur, though 145 caused a small amount. It does not seem affected by temperature, just current - I raised the thermal limit to 55C and ran the light on level 140 with repeated jumps to ceiling, then on momentary turbo (140) until it got very hot and still saw no smoke.

On level 140, I am getting ~1,330 lumens, where before my 5000K B35Am was producing 1,600 on turbo.


The fix for this in Anduril2:

Advanced mode, when on, press 10H > wait for the 4th blink, then do nothing. This will deactivate Turbo and set max output to ceiling. Then when on, 7H > 2nd blink > press 1C and then 1H to set ceiling to 140. Do this second step for both stepped and smooth ramping.

I’ll do a quick video on this too to hopefully get the word out more.

Thank you toobadorz and LuxWad for the quality research and the detailed solution to the problem! I really appreciate them.

Here’s a quick video going over the fix. It also shows off the intensity increase you can get by high-seating the throwy optic in the B35AM DM11.

Great video Lux!

I did the same like in the Luxwad Video with my D1 and DM11 B35AM and with a temperaturlimit from 50 degrees and ceiling 140 they work well and without smoke , thanks !

Hi Hank.

Any chance ToyKeeper and you could produce the ultimate RGB light using the D4V2 with White, red, blue, green emitters?

Also what do you think of this mod?

Ah!, Okay, Thanks. I wasnt aware of this.

[quote=xevious]

Yeah, if it had been one of the “side” LED’s, It’d bug me a lot more.

Ooph!, you got the opposite of me. And with it being one of the “side” LED’s too. That’s a bit unfortunate.
Thank you for the info.

My other D4SV2 has the Amber button LED’s. The Amber is very nice looking. It is perfectly uniform on both the low and high settings.

My main question still remains un-answered though.

There is a slight gap around the buttons retaining ring on my D4SV2.
Im wondering if this is a concern regarding water resistance?
Im a bit worried about using this light in the rain, and washing it under the tap with soap and water. I like to wash my lights.

The retaining ring is only seated about 85% of the way around the button leaving a slight gap on one side.
My other D4SV2 is fully seated 360°.


If it were me, I’d grab a socket in the same diameter and whack it once or twice.

I received my D1 (B35AM 5000K with cyan switch light) and I like it. It has nice neutral tint and I think the cyan switch light goes quite well with the grey body. I would like to thank toobadorz and LuxWad for their research on the smoking of B35AM. Following their recommendations, I disabled turbo and limited the ceiling level to 140. I too get around 1300 lumens with my setting. It has relatively low lumens compared to other lights, but it is bright enough for me especially with the focused beam profile.

I would love to see RGB switch light instead of a single color led. I don’ think it is too complicated to implement since RGB aux light is already supported in Anduril. Can’t you just put the RGB aux light into the switch? Is it hard to implement?

How is the problem solved with the smoking B35AM in the new batch ?! I heard from first new D1v2 without the problem in Turbo …

The problem is not solved. My D1 (received a couple days ago) with B35AM 5000K smokes on turbo.

One solution to avoid the smoke would be to configure the light to reduce output. Users found that B35AM does not smoke if output is limited to 140/150. So, I disabled turbo and limited the ceiling level to 140. One thing to note is that this configuration can be reset, so it would be crucial that users remember to configure the light every time they reset or reflash the light.

If you let it smoke with the reflector on, it seems that the reflector gets stained. So, I would highly recommend that you avoid the smoke.

Hank said he would limit the current in the future batches, but it has not been announced yet as far as I know.

There are 2 reports, comments over on TLF about the case
https://www.taschenlampen-forum.de/threads/neue-emisar-d1.86602/post-1172775

I´m not sure if you can see the post without logged in
The user Bobbers wrote:

“My D1 B35AM 4500K arrived today, Hank texted me yesterday that all the lamps are going through final inspection and that I can use the turbo as normal.
In any case, the first 40-50 seconds of turbo did not show any smoke on the LED :)”

And the user ennokin wrote:

“I ordered my D1 B35AM 4000K on 08/01 and he already sent me the new version. Turbo works without smoking, he also confirmed this to me by email.”

It seems the new version is ready. But we have to wait for Hanks reply

SFT-40 & FC-40 options have been added for Noctigon K1 flashlight,

RGB button has been added for D1, which can show the voltage just as K1, choose at hand which RGB color you want.

1 Thank

Now how about fitting that RGB button in D4v2?

Any plans for dual channel CC drive for D4v2?

The D4v2 is already available with dual channel : https://intl-outdoor.com/tint-ramping-instant-channel-swiching-led-flashlights/new-emisar-d4v2-with-tint-ramping-and-instant-channel-switching.html