Veleno Designs Quantum D2 Flashlight Review

The Veleno Designs Quantum D2 is a twisty 10180 light by the well-known Steve Ku. Despite being available for years, they’re still available!

Official Specs and Features

Here’s a link to the Veleno Designs Quantum D2 product page.

Versions

This is a bit of a tough one since I think the Quantum has gone through some revisions. This is the Quantum D2. At the very least there was a Quantum DD, which had the QTC (more on that later) in a different, less favorable, position.

The current version, the D2, is available in a few different emitter options (at least of and on). Cree XP-G3 (NW or CW), Nichia 219c, and occasionally Cree XP-L HI.

There also might be a coated version of the D2. I’m talking to Steve Ku now and I’ll flesh out this section for historical purposes, as much as he’s willing, and when he’s willing.

Price

All current options are $60, and while they aren’t in stock they do come in waves. Most times they get mentioned on the Veleno Designs Facebook page, which you can find here: facebook.com/VelenoDesigns

Short Review

This is a very cool and well considered little keychain light. There are a couple of things that make it a light I won’t use much, but it’s one I’m happy to have. I don’t love twisties, first of all. Secondly, while I love the technological side of QTC, in practice I almost never love lights with it. While it works well and fine here, it’s still QTC.

Long Review

The Big Table

Veleno Quantum
Emitter:	Cree XP-G2 (I think)
Price in USD at publication time:	$60.00
Cell:	1×10180
Highest Runtime	Highest Runtime
LVP?	No
Switch Type:	Twisty
On-Board Charging?	No
Claimed Lumens (lm)	–
Measured Lumens (at 30s)	31^
Claimed Throw (m)	–
Candela (Calculated) in cd (at 30s)	17lux @ 2.172m = 80cd
Throw (Calculated) (m)	17.9^
All my Veleno reviews!

^ Measurement disclaimer: Testing flashlights is my hobby. I use hobbyist-level equipment for testing, including some I made myself. Try not to get buried in the details of manufacturer specifications versus measurements recorded here; A certain amount of difference (say, 10 or 15%) is perfectly reasonable.

What’s Included

Veleno Designs Quantum D2
Keychain Triangle (2)
Spare O-ring

My package was purchased used and did not include a 10180. I had one, so it didn’t matter – but according to the documentation on the official page, a 10180 is included with the purchase price.

Package and Manual

The package is a plastic form fit (seen above) and a zip-top bag. There is no manual.

Build Quality and Disassembly

As I said above, the Quantum is a well-considered light. The body is stainless steel, which means that while living on a keychain and receiving a ton of abuse, it should have a long and happy life. Stainless is a very robust material.

A small, metallic cylindrical object with grooves and a looped handle on top is standing upright on a weathered wooden surface. The background is blurred.

A small, cylindrical metal container with a keyring attachment is standing upright on a weathered wooden surface. The background is blurred.

A small, metallic cylindrical object with a ridged top, standing upright on a weathered wooden surface. The background is blurred, emphasizing the object in focus.

This is a twisty light, and while there’s no knulring anywhere on the body, there are “vertical” lines into the head which allow grip enough for twisting.

The threads are very fine and also very long. That’s perfectly reasonable since it’s a progressive twisty. The tighter the head is twisted onto the body, the more output is obtained.

The tail end is a “dumb” cavity, too. Just a metal piece; no electronics or QTC bits or anything. (I believe in the Quantum DD, the QTC was in fact in the tail end; I think this differentiates the two).

Below, you can see the head (center) which includes the tiny square of the QTC compound.

The tail on all models has two sets of fins. These aren’t for cooling, but strictly for decoration – tritium fits in here. Steve will install these for free with the purchase of light and tritium. The tritium size is 1.5x6mm.

These tritium vials are visible from the side (through the fins) and also from the end.

Size and Comps

A silver pen is placed horizontally on top of a flatly laid US two-dollar bill, resting on a worn wooden surface. The bill features a portrait of Thomas Jefferson at the center.

A two-dollar bill with a metal pen clip attached to the left side, placed on a weathered wooden surface. The bill features a portrait of Thomas Jefferson.

A two-dollar bill with a silver combination lock chain placed on its left side, positioned on a weathered wooden surface.

A US two-dollar bill is laid flat on a wooden surface. A small metal carabiner is placed near the left side of the bill, partially covering the word TWO.

A proper smol light.

A hand wearing a red sleeve holds a small metallic object, possibly a part or tool, against a blurred outdoor background of brown grass. The letters ZEROAIR.ORG are faintly visible on the left side.

A person wearing a red jacket holds a small metallic object, resembling a flashlight or keychain, between their thumb and finger against a blurred outdoor background.

A person wearing a red and black jacket holds a small, silver cylindrical object, possibly a flashlight, in the palm of their hand. The background is out of focus and appears to be brown grass.

Here’s the test light with the venerable Convoy S2+. Mine’s a custom “baked” edition Nichia 219b triple. A very nice 18650 light.

A small red flashlight stands upright next to a compact silver lighter on a weathered wooden surface with a blurred background.

Close-up of two flashlights lying on a wooden surface, one larger with three LED emitters and one smaller with a single LED emitter, both facing toward the camera.

And here’s the light beside my custom-engraved TorchLAB BOSS 35, an 18350 light. I reviewed the aluminum version of that light in both 35 and 70 formats.

Below is another 10180 light. It’s different in a number of ways. First, this Astrolux M01 is titanium. Secondly, inside the body is a charge port! Since my Quantum didn’t come with a charger, I used this Astrolux as a charger. This is a reasonable trade off, since Steve’s [very cool] charger is $20, and the M01 itself is only $15ish and also includes a cell (which could be seen as a spare cell for the Quantum).

If you wonder does the M01 make me wish the Quantum was titanium? Yes, yes it does.

Retention and Carry

I always just throw this light in a pocket, but primarily you’ll probably use it on a keychain. There’s a very beefy triangle for connection, and a loop through the tail of the body for connecting this loop, too.

It’s probably possible to remove this triangle and connect the Quantum directly to a spit ring, too. This could be beneficial because you could grip the [bigger] split ring for easier twisting of the head for operation.

There’s no magnet, no pocket clip, nothing else for carrying the Quantum.

Power and Runtime

All Quantums are powered by a single 10810 cell. That’s a lithium-ion cell, so has a nominal voltage of 3.7V and fully charge should be around 4.2V. The 10180 cell that the Quantum needs is a bit specialized since the bottom (negative) needs to be revealed as seen below. I had to remove the wrapper with a razor blade, from the cell of the Astrolux M01.

As most lights, the cell goes into the light with the anode toward the emitter.

Here’s a runtime with the cell shown above. Output is quite low in my testing – from what I read, the D2 should be around 120 lumens. At startup, I’m only seeing around 55 lumens. This doesn’t bother me, since I’m not using this light in a way to need 120 lumens. And my version is old, so maybe with newer emitters, you’ll see higher output, too.

Neither runtime exhibited LVP; I ultimately shut the light off manually.

Also these two runtimes are essentially the same – I just twisted the light as tight as I could for “Highest” and ran that twice. Since the lower modes aren’t defined, picking one of those wouldn’t be all that meaningful for testing.

Pulse Width Modulation

No evidence of PWM on any mode. Three lower randomly selected modes, and finally the highest mode, too.

A digital oscilloscope screen displays a mostly flat yellow waveform near the top, with grid lines, measurement indicators, and settings like 0.1V DC and 50 microseconds visible at the bottom.

A digital oscilloscope screen displays a mostly flat yellow waveform near the top, with horizontal and vertical grid lines, labeled axes, and status information along the bottom and right edges.

Oscilloscope screen displaying a mostly flat yellow waveform with slight noise, horizontal and vertical gridlines, and indicators showing 2V, DC, 50µs, AUTO, Int, -0.24V, and the status as Waiting.

A digital oscilloscope screen displays a mostly flat yellow waveform along the top, with grid lines, measurement settings at the bottom, and the text JYETECH.COM in the lower right corner.

Here you can see a “baseline” – a chart with almost no light hitting the sensor.

Then there’s the Ultrafire WF-602C flashlight, which has some of the worst PWM I’ve seen. It’s so bad that I used a post about it to explain PWM! Here are multiple timescales (10ms, 5ms, 2ms, 1ms, 0.5ms, 0.2ms) to make comparing this “worst” PWM light to the test light easier. That post also explains why I didn’t test the WF-602C at the usual 50us scale.

User Interface and Operation

The user interface (and really how it works) is the real kicker. Yes, it’s a twisty. But it’s not a typical discreet mode twisty. It has a “ramping” progressive output, due to QTC. QTC is quantum-tunneling composite.

Quantum-tunnelling composite (QTC) is a flexible polymer which contains tiny metal particles. It is normally an insulator but if it is squeezed it becomes a conductor. QTC can be used to make membrane switches like those used on mobile phones, pressure sensors and speed controllers.

So in the application of flashlights, the more compressed the composite becomes (by twisting the head tighter), the more current it conducts. Which leads to more output.

It’s a very neat thing. QTC can wear out though, and so Steve includes a spare patch with the Quantum. I am not the biggest QTC fan, but this sample has worked great.

Here’s a user interface table!

State	Action	Result
Off	Tighten Head	On
On	Tighten Head More	Brighter
On	Loosen Head	Low to Off

LED and Beam

I purchased this used but was told it’s a Cree XP-G2. It’s an older variant, so that’s probably reasonable. If I was buying now I’d definitely get Nichia 219c or Cree XP-L HI. Those are good choices.

These beamshots always have the following settings: f8, ISO100, 0.3s shutter, and manual 5000K exposure. These photos are taken at floor level, and the beam hits the ceiling around 9 feet away. Sort of random modes from lower to highest output.

A completely black image with the text ZEROAIR.ORG written vertically on the left side in gray letters. No other objects or details are visible.

A completely black image with the text ZEROAIR.ORG in vertical, gray letters along the left side. No discernible objects or details are visible in the image.

A completely black image with the text ZEROAIR.ORG written vertically on the left side. No other visible details or objects are present.

A nearly black image with a faint dark green circular gradient in the center and the text “ZEROAIR.ORG” vertically aligned on the left side.

A mostly black image with a subtle, faint greenish circular gradient in the center and the text “ZEROAIR.ORG” vertically on the left side.

Tint vs BLF-348 (KillzoneFlashlights.com 219b version) (affiliate link)

I compare everything to the Killzone 219b BLF-348 because it’s inexpensive and has the best tint!

Conclusion

What I like

Great attention to build details
Includes (or can include) tritium
Updated to current emitter options
Steve is a great maker to support

What I don’t like

It’s a small twisty, so if you have big man hands it might be cumbersome to use
You need to really like QTC to like it
Pricey since it’s stainless and charger is extra

Notes

This light was provided by me for review. I was not paid to write this review.
This content originally appeared at zeroair.org. Please visit there for the best experience!
For flashlight-related patches, stickers, and gear, head over to PhotonPhreaks.com!
Use my amazon.com referral link if you’re willing to help support making more reviews like this one!
Please support me on Patreon! I deeply appreciate your support!