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Foursevens x Glow Rhino: Quark QK16L MKIII (Tritium Edition)

$150.00 $175.00

Introducing the Foursevens x Glow Rhino Quark QK16L MKIII (Tritium Edition):

Hail Prometheans and Foursevens Fam!

Welcome to 2026. Time for something old and something new. Back in October we dropped the first ever production flashlight that ships to your door with legally installed tritium. The Foursevens x Carryology x Glow Rhino drop sold out in under 2 hours. Yeah it was awesome, so we are following up with a second Tritium Edition Quark drop in collaboration with our friends at Glow Rhino.

The first Quark was launched in 2009. We’ve spent the last 17 years making it better, while maintaining nearly complete reverse compatibility. The Quark is meant to be used and it’s one of the most “experienced” flashlights in existence. This Quark comes with Tritium vials (2x green) legally installed. The vials are oriented so one is always facing directly up when the light is resting on its side.

We are offering a $25 discount on this drop (Wabi Sabi). Please see the Product Overview section below for details.

This light features a Nichia 319A in 5000K and 80+ CRI

A redesigned center section is larger in diameter than previous Quarks, but keeps the same diameter overall. This change has the added benefit of improving grip. This light is anodized in my new favorite color: Storm Grey with an Tritium Green highlight on the clip retaining ring.

* This package includes a FREE Xtar MC1 USB charger ($9.95 retail)
* Please charge your battery before use ;)

Discounts cannot be applied to this item

Foursevens x Glow Rhino: Quark QK16L MKIII (Tritium Edition)

Product Overview

1x16650

Nichia 319A

650

0.8

1.5 hrs

160 hrs

5000K @ 80+

We are offering a $25 discount on this drop (Wabi Sabi)
What’s the catch? Like most things, manufacturing is not easy. If you’ve been around a while you know I built this business on transparency and accountability. If you just showed up, ask someone who’s been around a while. I do my level best in all things. This round, we fell a little short. Read on for the details.

Wabi Sabi is the Japanese tradition of embracing the beauty of imperfection. These lights are meant to be used hard, and they tell the story of a life lived before they even arrived in your hands. They were shipped half way around the world, then across the US, and back. This batch suffered some cosmetic shipping damage over those thousands of miles.

We are replacing all the heads and tailcaps with brand new parts. However, we can’t rework the bodies because they already have the tritium installed in them. The remaining damage is limited to scuffing on the edges of the body flutes, and the occasional nick or ding elsewhere on the body. Basically what you’d get with a few weeks of daily use. The product images show two “representative” samples to give you an idea of what to expect. Some lights are better than others. Some people care about cosmetics more than others. We don’t love delivering less than perfection, but we’ve done the best we can under the circumstances. Good news is, you won't even notice in the dark ;)

All about Tritium
Tritium is an isotope of Hydrogen. Tritium capsules are coated with phosphor on the inside and filled with tritium gas, a byproduct of nuclear power generation. Tritium gas emits weak Beta radiation, and these electrons excite the phosphor coating, making it glow without being charged with an outside light source.

Beta radiation is so weak that it cannot even penetrate a sheet of paper or your skin, let alone the dense glass vial that contains it. In fact, Beta radiation can only travel about a 1/4" in air. The vials are then inserted into a polycarbonate plastic housing and permanently glued into the slots on the body. Even if broken, the gas is present in such small quantity, and the radiation is so weak, that it does not pose any risk. Don't eat them though. That would be dumb.

Tritium's glow is subtle, but it's plenty to find your light in low to no-light conditions when your vision is night adapted. It has a half-life of 12 years, meaning the radiation (and subsequent glow) will diminish by 50% over 12 years. It's also commonly used in watches, night sights, and many emergency exit signs.

Prometheus In the Wild

Product Details

The classic Quark, modernized: It was a huge responsibility to take something so good and improve upon it, but that’s just what we’ve done. When I took over the Foursevens brand from David in 2018, this Quark project quickly became all-consuming. How to take my 10 years of experience designing high-end custom flashlights and combine them with the decade David spent reiterating and refining the brand’s flagship? The end result is the Quark MKIII, the best Quark yet, and I’m thrilled to have the opportunity to get one into your hands.

Burst mode

Using a very fast double press, burst mode (100%) output is directly accessible from any previous level, and reverts to the last saved mode. Experts agree that most flashlights are used at lower level outputs, but sometimes you need to dial it to up. We've got you covered on both counts.

Hybrid Memory

A blend of memory and no-memory, the hybrid configuration saves the last mode used, but reverts to the first mode in the sequence when shifting out of a saved mode.

pocket friendly

I eliminated grooves or knurling under the pocket clip to ensure your light won't destroy your pants pocket, while maintaining the secure hold and smooth engagement you expect from my pocket clips.

Solid Copper (Direct Thermal) MCPCB

Pioneered by custom makers and modders, the LED is mounted to a solid copper PCB to provide superior thermal performance and maximum output. A first for the Quark.

digital bump protection

Exclusive to Prometheus and Foursevens, Digital Bump Protection prevents accidental mode changes if the light is dropped or tapped on a surface when tail standing. The software detects very short power interruptions and ignores them. Other lights will think you've requested a mode change.

DIY Friendly

*warning-nerd content* This industry was created by individual makers and modders working at home on their kitchen tables. People who love tinkering, technology, and flashlights! Unlike most industries, flashlights have been driven by the little guys and we intend to honor that tradition. Most manufacturers (including Foursevens in the past) glue or thread lock on certain components so they cannot be disassembled without a lot of effort and/or destroying the light. This was to prevent people from tinkering. I say tinker on my friends!

Included with your Quark

Quark QK16L Flashlight
Foursevens 16650 battery
Tailstand Cap
2 Spare O-rings
Instruction Manual
Xtar MC1 Charger and USB A-C Cable

Operating your Quark is simple:

Make sure that the battery is inserted with the positive side (+) toward the head.
To turn it on press or click the tailcap button. A press allows momentary activation of the light.
A quick off/on cycle changes modes
Two very quick off/on cycles activates burst mode
Enter configuration mode with 10 on/off cycles in less than 3 seconds: The light will begin to blink a number of times corresponding to the selected configuration. For example if you are in Config. 3: 3 blinks, pause, 3 blinks. If there is no input for 5 seconds the light will exit configuration mode.
Turn the light off for 5 seconds to save the current configuration to memory

All Quarks are initially set to Configuration 3 with Medium/High/Burst. They can be reconfigured as often as you'd like.

Here are the possible configurations:

Config. 1: High - (Burst 100%)
Config. 2: Max (100%) - Strobe
Config. 3: Medium - High - (Burst)
Config. 4: Low - Medium - High - (Burst)
Config. 5: High - Medium - Low - (Burst)
Config. 6: Low - Med - High - Strobe - SOS - Beacon - (Burst)

Brightness Levels

Low (Moonlight): 0.8 lumens, 160 hrs
Medium: 70 lumens, 5 hrs
High 350 lumens 1.6 hrs
Max/Burst 650 lumens, 1.5 hrs (30 seconds burst, then steps down to high)

LED Type

Nichia 319A (5000K / 80+ CRI)
battery type

Foursevens 16650 battery (2200mAh - 4.4A - protected Li-Ion)
Weight

3.2 oz (with battery)
Dimensions

Length: 4.5" / Diameter: 0.88"
Voltage Range

2.8V-4.2V

Beam Distance

170m
Body Materials

Type-III hard-anodized 6061-T6 aluminum
Window Glass

Optical grade glass (2 side AR coated)
Water Resistance

IPX8 (1m)
Where it's Made

Industry-leading LED

The QK16L MKIII Onibi the Nichia 319A with 5000K color temperature and 80+ CRI. It's meant to strike the perfect balance between beam quality and output.

Configurable interface

No one can agree on the best program setup so we offer 6 convenient program presets (configurations). Choose your favorite, at any time. The configurable interface is standardized across the entire Foursevens line. No matter what light you pick up, you'll know exactly how to use it.

The best pocket clips on the market

Pocket clips are my jam because I obsess about every detail, because every detail matters. The new clip is made from thicker material, provides easier pocketing, and improved grip. Most of the "grip" on a flashlight comes from the pocket clip, not the surface finish.

tailstand cap

(if you know, you know.): The Tailstand Cap is designed to be backwards compatible with all Quarks ever made. All Quarks ship with the traditional forward (momentary) clicky switch that stands proud of the tail. For those who prefer a recessed button and a light that can tailstand, we also include the all new snap-on Quark Tailstand Cap.

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