could be a Stainless Steel with less iron content, would be my guess.
Beautiful lights Lux! Glad to hear they’re good quality. All of mine have been perfect… interestingly, I saw SST20 4000K for the first time today on my new D4SV2 and I love it. Nice soft color for an outside walk
I’m loading my cart with a D4V2 and I’m wondering about choosing the 2700K version.
Any major cons of these leds in this flashlight? My first option was going to be the XP-L HI V3 3A 5000K.
Any information is appreciated 
I don’t have any info on the e21 2700k in the d4v2, but I have the sst20 2700k in a c8 style thrower and it has surprising range and brightness for such a warm tint. I love it in that thrower, abd it has made me consider it in the KR4 when I previously would’ve never considered it
Thanks for your feedback Artiet59!
I guess that in a C8 the behaviour of this led will be a bit different, as these will be under optics! Still, it is good to know that the brightness vs tint is good.
My main concerns are regarding heating (compared to XP-L HI) and also about these leds having some “greenish” trail as others SST20 leds have. I would like not having it, hence my question.
Today received my green D4sV2. i never thought the day would happen, for 6 months i was convinced (because hank told me) that hank wasn’t making anymore green D4sV2 but now i have one. 4000k, it is awesome! throwy and bright!
Side Note- the green is much different then i thought it would be and i like it more than i thought i would. really almost looks gray, very subtle.
Also, this was my second order from hank in the last month that from the day of order to arrival at my house in CT, USA that took 15 days! really happy with hanks shipping times.
Hi Hank, will Nichia 219C be available again?
I sure would love a E21 2000K D4sV2
Hank site says «The new batch D4V2 does not have lanyard hole for better hand comfortableness, if you need lanyard attachment hole, please send us an email.» - is this true? Do someone have D4V2 from new batch and can post a picture?
Just got a new cyan D4Sv2 and noticed there is no more mid-ramp blink when switching between regulated and FET output. Old D4Sv1 and all my D4/D4v2 have it (aside from the e21a of course), wondering if this is due to a driver difference in the new model? or was it taken out of anduril? Can anybody confirm their recent batch D4Sv2 do/don’t have the blink?
A lot of build targets have had the mid-ramp blink removed. Sometimes it’s useful, but quite often, people just think it’s a bug. As drivers get better, the blink gets less relevant, so a lot of lights don’t have it.
The blink makes sense on an original D4. It’s a FET+1 design, and the top of the +1 happens roughly halfway between floor and ceiling. They’re at 65/150 and 120/150.
On D4S v1, it used a FET+3 design, so the channel changes at a higher point. It’s at 83/150. It’s a little awkward there, but still somewhat useful.
On D4S v2, it uses a FET+3+1 design and the top of +3+1 is even higher, at 93/150. When ramping up, this puts the mid-ramp blink right next to the ceiling blink, which is kind of annoying. So when I was removing blinks from lights which didn’t really need it, the D4S v2 was updated too.
If you want it back, enable the “BLINK_AT_RAMP_MIDDLE” option in the code.
Awesome! Thanks ToyKeeper
Hank is in short supply of the holes. 
I’d really like a 21700-body for my D4S’s. At a reasonable price I think they’d sell like hot cake.
It really wouldn’t take much to make the K1/K9.3 battery tube fit. They’re very close in size and the threads look the same
And if I squeeze hard enough, it works!
Haha
I actually have noticed that no matter what lanyard I use on my 9.3’s or D4SV2’s, it doesn’t sit easily on the tail cap when I set it on a flat surface pointing up at the ceiling. I always have to monkey around with the lanyard to get it to sit flat
Must be pretty recent. I just ordered a D4v2 one month ago, and it has the hole. Not that I have any plans to use it, so hole or not, wouldn’t matter to me.
I see loneoceans show the circuit:
You can see it here https://budgetlightforum.com/t/-/54052/461
loneoceans also post details of the driver
Photo from loneoceans, not taken by me
Anyone have a beam shot of this one? I'd love to see a 2k light next to a CW light
I really like that! Imagining this in one color and the tube a bit shorter, cause it wouldn’t need the charger… Would be really awesome if you ask me.
Short after I had the idea of how nice a 21700 D4S-body would be, it also came to my mind if the K9.3 body would fit the D4S head. Thanks for testing, it’s a little bummer that it doesn’t fit.
Heck, I would even buy another D4S(V2) if there was an option for a 21700 body that fit’s my other D4S’s.
I love the D4S for it’s output and especially for the beam shape. The Ledil Angie-S is by far the best multi-emitter optic I’ve seen so far.
I’m wondering if other D4S(V2) owners would be interested and if Hank would consider offering this.