Had a reply from Intl-outdoors re the faulty d$v2 i received, and there sending out a replacement 
I’ve been asked to return the faulty one, however i’m not sure at this time on weather the whole order needs returning (18350 tube+stainless bezel+magnetic tailcap) or just the main D4v2 with magnetic tailcap
it needs to be shipped back to China, so at the moment I’m just waiting on a response as to what exactly needs to be returned
Bounces up and down in frustrating while staring at the mailbox
Come on USPS… GIMME MY D4v2!!! 
Where do I find your chili peppers in your review? 
I´m gonna jump on the wagon and get med one of theese soon.
The one thing that boggles me is the LED choice, generally i prefer more Cool White lights and i´m looking at getting a more “throw”.
I know the D4 V2 isn´t a thrower, but which LED would give me a cooler tint and a tad more throw?
Sst-20 6500k
It’s a D4. It has all the chili peppers. That’s kind of its thing. 
I tried to measure aux LED power use again. I can’t say for sure my numbers are good, since my D4v2 has the resistors set up differently than a production model, and my measuring equipment isn’t very precise at low power levels, but here’s what I got…
- Low mode (rainbow): 0.077 mA to 0.107 mA, depending on how I measure
Runtime: 3.7 to 5.2 years
- High mode (rainbow): 2.89 to 3.01 mA, depending on how I measure
Runtime: 48 to 50 days
- Blinky mode (rainbow): 0.205 to 0.424 mA, depending on how I measure
Runtime: 0.9 to 1.9 years
- Moon mode: ~1.8 mA
Runtime: ~81 days
These were each sampled over time and then averaged. The power source was at 3.7V. Runtimes assume a 3500 mAh cell.
[quote=pint]
Had a reply from Intl-outdoors re the faulty d$v2 i received, and there sending out a replacement
I’ve been asked to return the faulty one”
That sounds expensive. I am surprised they want it back. Kind of makes it impractical.
[quote=pennzy]
Maybe they want it back so they can investigate to see what went wrong. Perhaps you can ask them to reimburse you for shipping?
I have noticed ringing with certain strobe frequencies coming from the tailcap. Has anyone else noticed audible resonance occuring with certain strobe frequencies?
I tried all the different strobes, but not different frequencies, mine has the magnetic tailcap ……. nothing heard here.
Go to the party strobe (tactical works also) and adjust the frequency while listening closely to the tailcap. If you have the full length battery tube it is harder to hear so put it close to your ear. With the 18350 tube it is pretty loud. Happens on both of my lights with different emitters.
Edit: The ringing seems to be from the FET switching and inducing voltage ringing in the circuit.
I will try and get some voltage measurements on my oscilloscope tomorrow, if the ringing pushes the FET drain-source voltage too high it may shorten the lifespan of the FET.
I had this sound happen with my PL47 but on no other FET light in any mode. Wasn’t just in strobe either, you could hear ringing that changed pitch as it was ramped up and down in normal mode.
Oof, probably not the most ideal circuit design. 
Thanks for measuring the aux led power usage again.
Yes. I’ve noticed this on almost every FET-based light I have.
On some early designs, the ringing would actually make the attiny chip reboot. This happened both on strobe modes and on regular PWM’d FET modes. Each time the FET closed and stopped current flowing, it made a voltage spike well out of the attiny’s specs and tolerance. But the circuit designs were updated to soften and absorb that spike, and I think all the current designs have at least some similar measures included.
I think the dampener is between MCU and FET though. I’m not sure if it helps protect the FET itself, or just the MCU. Probably some of each, since IIRC it softens the edges of each pulse. But I don’t have a scope to actually measure it.
The Emisar products are probably fine, since the drivers were designed by the same person who identified and fixed the ringing-reboot problem in the first place. I’m not sure about other brands though.
its funny, my d4v2 cant start fires, tried it today was curious and used it with a piece of paper, ended up blinding me temporarily. feels like i was looking at the sun for few minutes.
I’m just guessing here but it’s probly because it’s running anduril ,which means it can’t be on full power more than a few seconds because of the aggressive step downs , you can start a fire with a D4 with ramping ui or ramping v2.
To ignite paper using light, it helps if the paper is black or dark-colored.
Also, I finally updated the UI diagram. It shows the new features now, mostly. It’s getting quite crowded though, with all the different functions available.
