Foursevens Quark QK16L MKIII flashlight review

Nichia 319A LED
700 lm output
7225 cd intensity
1 x 16650 Li-Ion battery

The Foursevens Quark QK16L MKIII flashlight was released in 2019. It uses Nichia 319A LED, OP reflector and 1 x 16650 Li-Ion battery. The powerful emitter in this flashlight provides up to 700 lm output, 7225 cd intensity, and a beam distance of 170 m.

Wondering if this Foursevens flashlight is awesome? Stick around until the end of our article!

Table of Contents

  • Foursevens Quark QK16L MKIII specifications
    • Body, materials, weight, colors
    • System, LED, lens, reflector
    • Performance, flux, intensity, throw
    • Software, user interface, modes
    • Features, battery, protections
    • Accessories, package contents
    • Links
  • Conclusion, pros and cons
  • Photos

The content of this article reflects our own experiences and viewpoints. We aim to offer insights on a topic, and we hope others find it helpful and motivating. Additionally, we make every effort to provide accurate and comprehensive coverage.

Foursevens Quark QK16L MKIII / QK16LMKIII

The Quark QK16L MKIII is a powerful and reliable flashlight. It has impressive illumination and durable construction. This light has 4 modes of lighting. The Quark QK16L MKIII mode memory eliminates the need to cycle through modes. It provides convenience and saves time. You can use the strobe function as a self-defense tool.

Foursevens Quark QK16L MKIII specifications

NameQuark QK16L MKIII
Rated 4 / 5 based on 1502 user votes.

This Foursevens flashlight offers portability, versatility, and reliability.

Foursevens Quark QK16L MKIII / 1

Body, materials, weight, colors

Weight90.7 g
Length114.3 mm
Head diameter22.4 mm
Materialaluminium alloy with HAIII hard-anodized finish

The flashlight is lightweight and easy to handle for most people. A smaller flashlight is easier to carry in a pocket, bag, or pouch. The aluminium body of the Quark QK16L MKIII has excellent thermal conductivity. HAIII is a specific anodizing process, it creates a thicker and harder oxide layer than regular anodizing. The Quark QK16L MKIII flashlight is available in black.

Foursevens Quark QK16L MKIII / 2

System, LED, lens, reflector

EmitterNichia 319A LED
Color temperature5000 K
LensAR coated glass
Switchmechanical rear

The emitter of Quark QK16L MKIII manufactured by Nichia, a Japanese LED manufacturer. Warm, white light is generally more comfortable. The Quark QK16L MKIII has an orange peel (OP) textured reflector. Orange peel reflectors have smoother beams. The AR coating is thin and applied to the lens surface. Mechanical switches are usually robust. Rear switches are common on tactical flashlights.

Performance, flux, intensity, throw

Flux700 lm
Intensity7225 cd
Throw170 m
CD/LM factor10.32

With 700 lm, the Quark QK16L MKIII flashlight will offer a brighter and more powerful beam of light. The Quark QK16L MKIII flashlight has 7225 cd, it provides a much brighter and more intense beam. The throw is the distance in meters at which the flashlight produces a light intensity of 0.25 lux. Candela per lumen (cd/lm) measures a flashlight's beam intensity. If accurate color is a priority for you, choose a flashlight with a CRI of 90 or above. This flashlight has a higher CRI. It can offer more accurate color rendering.

Software, user interface, modes

Modes4 modes
Mode memoryyes
Ramping modeno

A flashlight's modes are different output settings or brightness levels. The flashlight has mode memory. It remembers the mode you were using when the light was last turned off. The Quark QK16L MKIII is tactical strobe ready. The strobe light is disorienting to the person it is aimed at, this makes it hard for them to concentrate. The SOS flashes Morse code so you can signal for help when needed.

Features, battery, protections

Battery1 x 16650 Li-Ion battery
Battery indicatorno
Charger portno
Thermal regulationno

The Quark QK16L MKIII flashlight's power source is 1 x 16650 Li-Ion battery. The Quark QK16L MKIII cannot charge batteries. You may need an external charger to keep your battery going. This flashlight has built-in low voltage protection (LVP). It prevents damage from over-discharge. This light does not have temperature control feature. The "8" in the IPx8 rating means the highest level of protection.

Accessories, package contents

Package contents16650 battery
spare rubber cover

By including a battery with the flashlight, you avoid the extra expense.

Official sitehttps://darksucks.com/collections/foursevens

Conclusion, pros and cons

This Foursevens flashlight, like any other, has its strengths and weaknesses. Let's take a close look at both sides to understand this flashlight better. I share my thoughts on its standout features and the parts that might need improvement. Keep in mind, these are just my opinions, and you might have a different perspective.


  • lightweight
  • aluminium body
  • warm light
  • OP reflector
  • AR coated lens
  • tactical switch
  • high CRI
  • multiple modes
  • mode memory
  • tactical strobe
  • SOS/beacon function
  • low-voltage protection
  • waterproof
  • battery included


  • moderated performance
  • no battery indicator
  • no built-in charger
  • no thermal regulation
  • no auxiliary LEDs
  • non-magnetic


Foursevens Quark QK16L MKIII / QK16LMKIII photo 1.
Foursevens Quark QK16L MKIII / QK16LMKIII photo 2.
Foursevens Quark QK16L MKIII / QK16LMKIII photo 3.
Foursevens Quark QK16L MKIII / QK16LMKIII

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Updated: April 24, 2024

David Hagon
I love bushcraft and flashlights. I find joy in mastering wilderness survival skills and exploring the realm of illuminating gadgets. Bushcraft isn't just fun, it's a learning journey. I form a strong bond with nature. It's more than a hobby, it enriches me in practical and spiritual ways.