Sofirn SD01 diving light review

3 x Luminus SST40 LEDs
6000 lm output
64162 cd intensity
4 x 18650 Li-Ion batteries

The Sofirn SD01 diving light was released in 2021. It uses 3 x Luminus SST40 LEDs, SMO reflector and 4 x 18650 Li-Ion batteries. The powerful emitter in this diving light provides up to 6000 lm output, 64162 cd intensity, and a beam distance of 507 m.

Excited to learn if the SD01 lives up to expectations? Read on!

Table of Contents

  • Sofirn SD01 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
  • 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.

Sofirn SD01 / SD01

This light has 4 modes of lighting. The memory function is a nice feature, the light will remember the last used mode.

Sofirn SD01 specifications

Rated 3 / 5 based on 1264 user votes.
Formdiving light

Sofirn SD01 / 7

Body, materials, weight, colors

Weight558 g
Length147 mm
Head diameter76.5 mm
Materialaluminium alloy with HAIII hard-anodized finish

This 558 g flashlight is quite heavy for a handheld flashlight. The length of a flashlight can affect how it feels in your hand and how you can grip it. The aluminium body of the SD01 has a reputation for being durable and strong. Flashlight makers widely use HAIII coating. The SD01 flashlight comes in a stylish black color.

Sofirn SD01 / 5

System, LED, lens, reflector

Emitter3 x Luminus SST40 LEDs
Color temperature5500 K
Switchrotary front

Luminus is a US-based LED manufacturer. In the lighting industry, it has gained recognition as reputable. Color temperature is used to quantify the color appearance of light sources. The SD01 has a smooth reflector. It gives you a better hotspot, and it throws better.

Sofirn SD01 / 4

Performance, flux, intensity, throw

Flux6000 lm
Intensity64162 cd
Throw507 m
CD/LM factor10.69

The SD01 flashlight has 6000 lm. It will provide an exceptionally bright and powerful beam of light. 64162 cd represents an extremely high level of brightness for a flashlight. The throw is the distance in meters at which the flashlight produces a light intensity of 0.25 lux. The cd/lm factor is the candela-to-lumen ratio. It shows how concentrated a light source's output is.

Sofirn SD01 / 8

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.

Sofirn SD01 / 2

Features, battery, protections

Battery4 x 18650 Li-Ion batteries
Battery indicatorno
Charger portno
Thermal regulationyes
ProtectionIPx8, depth 100 meters
Impact resistance1 m

The Sofirn SD01 flashlight is powered by 4 x 18650 Li-Ion batteries. The SD01 cannot charge batteries. You may need an external charger to keep your battery going. The flashlight detects when the battery's voltage has dropped to a certain level. The built-in thermal control adjusts brightness output to prevent overheating. The "8" in the IPx8, depth 100 meters rating means the highest level of protection. The SD01 flashlight proudly boasts an exceptional impact resistance rating of 1 m.

Sofirn SD01 / 1

Accessories, package contents

Package contents2 x spare o-rings

The lanyard of the SD01 protects the flashlight from accidental damage. Replacing worn or damaged O-rings helps a lot.

Sofirn SD01 / 3
Official sitehttps://sofirnlight.com/

Conclusion, pros and cons

This Sofirn 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
  • rotary switch
  • strong flux
  • super bright
  • multiple modes
  • mode memory
  • low-voltage protection
  • thermal regulation
  • waterproof


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


Sofirn SD01 / SD01 photo 1.
Sofirn SD01 / SD01 photo 2.
Sofirn SD01 / SD01 photo 3.
Sofirn SD01 / SD01 photo 4.
Sofirn SD01 / SD01 photo 5.
Sofirn SD01 / SD01 photo 6.
Sofirn SD01 / SD01 photo 7.
Sofirn SD01 / SD01 photo 8.
Sofirn SD01 / SD01 photo 9.
Sofirn SD01 / SD01


According to our statistics, the Sofirn SD01 flashlight was most often compared on our site with the following flashlights.

If there’s information about the Sofirn SD01 that you would like to see on this site, then write to us.

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.