Nice, thank you for reply 
Woah… shipping faster than expected. Got ship notice for my pre-ordered D1 from Mountain Electronics on Monday.
It arrived in my hands in California today on Wednesday. :sunglasses:
Mine is waiting at home for me.
I believe the stock optic (10621) is the most narrow-beam option available for this application (10mm quad optic). The 10622 is the “mid-range” and the 10623 is the most floody.
Here you can see the comparative beam shots for each:
EDIT: It has been determined that the stock optic on the D4 is actually the mid-range Carclo 10622, not the 10621 as initially described. :+1:
Just received my D4 from Mountain Electronics… and holy crap this thing is bright! For how small it is, it really shells out some serous light. Along with that light, it has an incredible amount of heat. I got the XP-L Hi 3A and this thing gets hot FAST on turbo. I have a triple Convoy S6 with XP-L V6’s with a FET in it and it doesn’t heat up nearly as fast as this light does. This D4 is a true hot rod.
I even got the shorter 18350 tube for kicks and giggles, and the light/heat is still staggering. It’s so much fun! :smiling_imp:
I do notice it stepping itself down as it heats up. What are the specs on the temperature limits as when it goes down further, and by how much?
I now understand why ToyKeeper kept reiterating about the lock-out mode in the review. I’ll definitely be using that religiously with this light. :+1:
I’ve been curious too, so I finally measured. My setup measures at 5m then calculates back to 1m. I have the light and meter both raised, above carpet, and obstacles on both sides of the path, to prevent spill from bouncing into the meter… so it only picks up the hotspot. This may result in lower throw values than what some people measure, but it better represents how the light should perform outdoors. (in contrast, one of the worst ways to measure throw is by aiming down a long white hallway with a hard floor, since much of the spill will bounce off the walls/floor and hit the meter)
I got 28.6 kcd at start on my D4vn with a 30Q fresh off the charger. Or 25.4 kcd at start with a 25R at 3.9V. These numbers can be compared to the throw measurements in this thread’s OP.
Since these are at start on maximum power on a very overpowered light, the throw drops very quickly due to heat and voltage sag. During regular use, you can expect significantly less throw (unless you only use the light ~3 seconds at a time, on max turbo). However, the D1 and D1S should be far less prone to heat and voltage sag, so their throw during normal use should be much closer to the throw at start.
For something somewhat similar to a D1 or D1s, I measured my BLF X6v2. I got 55 kcd at start with 30Q after using the cell for a D4 test, or 47.6 kcd with a 25R at 3.9V (also after running a D4 test).
I also took some pics of the beam compared to the 219c model. The camera used daylight white balance, and the pictures show pretty much how the beam looks to me in real life. Pictures haven’t been edited at all except to resize them. Both lights were running at the 100%–7135 level, ~140 lm.
Left: D4vn. Right: D4-219c.
The temperature limit is whatever you set it to, with a default of 45 C (ish, uncalibrated sensor). It steps down proportional to what it thinks the temperature will be in a few seconds, or steps up by one ramp level at a time when the temperature is below the target zone.
If there’s ever a v3 using my newer code, it’ll also step up proportionally instead of just one ramp level at a time… and the adjustments are much much more smooth so they’re difficult to see by eye.
However, if you were to do five output graphs on turbo, on the same light, you’d likely get five different results. It depends on a lot of factors… like ambient temperature, the light’s starting temperature, battery type and voltage and age, and noise in the sensor readings. But the five graphs should at least be similar.
Mine hasn’t even been sent yet. 
(I didn’t order from Mtn though)
Just got one delivered from MT, thanks for the review 
That blue is a fun new color. Nice to see something out of the ordinary.
While I like the new color, the black switch bezel is something I REALLY like!
Wonder whether these are one-offs or future production colours.
Thank you freefly.
the green is much more dignified
the blue might be appropriate for baby boy announcement gifts
(better than cigars)
I have tested my D4 throw using a Efest 2600 imr cell which has the XPL-Hi V3 1A led option-
At 4.19 volts - 21kcd and 4150 lumens
At 3.94 volts –18kcd and 3500 lumens
For comparison i measure the zebralight sc600 mk11 peak values at 10kcd and 1070 lumens using the same gear.
My XP-L HI 1A with VTC5A in the cold UK out throws my Acebeam X80 and that has 27,480cd!!!
I don’t think that’s a black switch bezel. I think the switch retaining ring simply hadn’t been put in yet. That’s how the D4 looks with the ring removed.
One picture shows the blue model with a switch retaining ring, the other picture shows it without.
(… Too bad there wasn’t a pic of the D7…)
So we can expect pink?
The X80 has a beam pattern of about 1.1 cd / lm. It’s basically a “mule”. The D4 XP-L HI does about 4.7 cd / lm, which puts it at the floody end of general-purpose lights but still quite a bit more throwy than a mule.
In general, if a light has a low enough cd / lm value, it doesn’t really matter what its rated throw number says. The bright foreground area will make anything at a distance hard to see. The X80 is only for illuminating at a short distance, for pretty much the same reasons as a light bulb.
Similarly, if a light has a high enough cd / lm value, it doesn’t really matter how many lumens it makes. It won’t be useful for up-close tasks, for the same reasons as a laser. The light needs to be spread across a wide area for up-close work, instead of just a small point.
The X80 is effectively a portable 25,000 lumen light bulb. It’s not quite as floody as a traditional 360-degree bulb, but it’s very close to many 180-degree “downlights”.
Ah, so that’s where the last 4 Aspire cells went. 
I had the page open to order, but went to eat first and when I came back they were out of stock. Oops.