Convoy M21C SST40 flashlight review

Luminus SST40 LED
2300 lm output
98000 cd intensity
1 x 21700 Li-Ion battery

The Convoy M21C SST40 flashlight was released in 2020. It uses Luminus SST40 LED, SMO reflector and 1 x 21700 Li-Ion battery. The powerful emitter in this flashlight provides up to 2300 lm output, 98000 cd intensity, and a beam distance of 626 m.

Want to find out if the Convoy M21C SST40 is good? Keep reading to know!

Table of Contents

  • Convoy M21C SST40 specifications
    • Body, materials, weight, colors
    • System, LED, lens, reflector
    • Performance, flux, intensity, throw
    • Software, user interface, modes
    • Features, battery, protections
    • Accessories, package contents
  • Conclusion, pros and cons
  • Photos
  • Comparisons

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.

Convoy M21C SST40 / M21CSST40

The flashlight is a must-have tool for outdoor activities, it offers guidance and safety. This light has 4 modes of lighting. With mode memory, when you turn off the M21C SST40 and then turn it back on, it will activate the last used mode.

Convoy M21C SST40 specifications

NameM21C SST40
Rated 3 / 5 based on 1526 user votes.

The M21C SST40 flashlight enhances safety.

Convoy M21C SST40 / 10

Body, materials, weight, colors

Weight275 g
Length163 mm
Body diameter28 mm
Head diameter55 mm
Materialaluminium alloy with HAIII hard-anodized finish

This 275 g flashlight is heavier than the average handheld flashlight. Consider the length of the flashlight, it should fit comfortably in your chosen way to carry it. Aluminium is a lightweight material, which is beneficial for M21C SST40 flashlight. The body of M21C SST40 flashlight treated with a Type III hard-anodized, anti-abrasive finish. The M21C SST40 flashlight comes in many colors.

Convoy M21C SST40 / 9

System, LED, lens, reflector

EmitterLuminus SST40 LED
Color temperature5000 K, 6500 K
LensAR coated glass
Switchmechanical rear, reverse clicky

We know Luminus LEDs for their efficiency, brightness, color accuracy, and long lifespan. The color temperature choice depends on the light's use and personal taste. The M21C SST40 uses a smooth reflector. A smooth reflector has a polished, mirror-like surface. The AR coating of the lens helps to reduce reflections. The M21C SST40 uses multiple switches. They allow for one-handed operation. Mechanical switches offer tactile feedback. Users can feel a distinct click or resistance when they press the switch. The rear switch of the M21C SST40 is usually operated with the thumb or finger.

Convoy M21C SST40 / 2

Performance, flux, intensity, throw

Flux2300 lm
Intensity98000 cd
Throw626 m
CD/LM factor42.61

The 2300 lm output of M21C SST40 provides great flexibility. The flashlight has 98000 cd. This light can illuminate objects or areas with great brightness and clarity. The throw distance is the farthest distance the flashlight can light an object. The candela per lumen (cd/lm) ratio can be used to determine if a flashlight has a spot or flood type beam.

Convoy M21C SST40 / 7

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.

Convoy M21C SST40 / 1

Features, battery, protections

Battery1 x 21700 Li-Ion battery
Battery indicatorno
Charger portno
Thermal regulationyes

The M21C SST40 flashlight utilizes 1 x 21700 Li-Ion battery as its power source. The M21C SST40 doesn't have charger port. LVP (Low Voltage Protection) is designed to protect the battery. The thermal protection feature helps prevent overheating.

Convoy M21C SST40 / 8

Accessories, package contents

Package contents2 x spare o-ring

Instead of searching for matching O-rings, having spare O-rings allows quick fixes.

Conclusion, pros and cons

This Convoy 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.


  • aluminium body
  • body color options
  • warm light
  • AR coated lens
  • tactical switch
  • super bright
  • multiple modes
  • mode memory
  • low-voltage protection
  • thermal regulation


  • no battery indicator
  • no built-in charger
  • no auxiliary LEDs
  • non-magnetic


Convoy M21C SST40 / M21CSST40 photo 1.
Convoy M21C SST40 / M21CSST40 photo 2.
Convoy M21C SST40 / M21CSST40 photo 3.
Convoy M21C SST40 / M21CSST40 photo 4.
Convoy M21C SST40 / M21CSST40 photo 5.
Convoy M21C SST40 / M21CSST40 photo 6.
Convoy M21C SST40 / M21CSST40 photo 7.
Convoy M21C SST40 / M21CSST40 photo 8.
Convoy M21C SST40 / M21CSST40 photo 9.
Convoy M21C SST40 / M21CSST40 photo 10.
Convoy M21C SST40 / M21CSST40 photo 11.
Convoy M21C SST40 / M21CSST40


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Updated: April 23, 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.