Acebeam D20 diving light review

2700 lm output
24200 cd intensity
1 x 21700 Li-Ion battery

The Acebeam D20 diving light was released in 2019. It uses Cree XHP35 HD LED, SMO reflector and 1 x 21700 Li-Ion battery. The powerful emitter in this diving light provides up to 2700 lm output, 24200 cd intensity, and a beam distance of 311 m.

Keen to discover if this Acebeam diving light lives up to the hype? Keep reading!

Table of Contents

  • Acebeam D20 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.

Acebeam D20 / D20

This light has 2 modes of lighting. The D20's mode memory makes the flashlight start in your preferred or needed mode.

Acebeam D20 specifications

Rated 4 / 5 based on 1492 user votes.
Formdiving light

Acebeam D20 / 2

Body, materials, weight, colors

Weight128 g
Length136 mm
Body diameter27 mm
Head diameter34 mm
Materialaluminium alloy with HAIII hard-anodized finish

The flashlight is comfortable to hold for a long time, and it is also easy to carry in pockets or bags. A smaller flashlight is easier to carry in a pocket, bag, or pouch. Aluminium is a lightweight material, which is beneficial for D20 flashlight. The HAIII process makes a hard and wear-resistant surface on the aluminum. The D20 flashlight is available in black.

Acebeam D20 / 3

System, LED, lens, reflector

EmitterCree XHP35 HD LED
Color temperature6500 K
Lenstoughtened AR coated glass
Switchelectronic side

Lighting professionals trust Cree LEDs. Cree LEDs have gained a strong reputation for quality and performance. The color temperature choice depends on the light's use and personal taste. The smooth reflector creates a well-defined hotspot at the center. The AR coating is thin and applied to the lens surface. Some flashlights with electronic switches have programmable features.

Acebeam D20 / 1

Performance, flux, intensity, throw

Flux2700 lm
Intensity24200 cd
Throw311 m
CD/LM factor8.96

With 2700 lm, the D20 flashlight will offer a brighter and more powerful beam of light. The D20 flashlight has 24200 cd, it can light objects at greater distances. The throw is the distance in meters at which the flashlight produces a light intensity of 0.25 lux. The candela per lumen (cd/lm) ratio can be used to determine if a flashlight has a spot or flood type beam.

Software, user interface, modes

Modes2 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 SOS flashes Morse code so you can signal for help when needed.

Features, battery, protections

Battery1 x 21700 Li-Ion battery
Battery indicatoryes
Charger portno
Thermal regulationyes
Protectiondepth 200 meters

The D20 flashlight utilizes 1 x 21700 Li-Ion battery as its power source. The battery indicator prevents surprise power failures. The D20 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. The built-in thermal control adjusts brightness output to prevent overheating.

Accessories, package contents

Package contents18650 adapter
2 x spare o-rings
21700 battery with microUSB
microUSB cable

The included battery lets you immediately use the flashlight for your desired applications. The lanyard of the D20 protects the flashlight from accidental damage. Instead of searching for matching O-rings, having spare O-rings allows quick fixes.

Official sitehttps://www.acebeam.com/

Conclusion, pros and cons

This Acebeam 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
  • AR coated lens
  • side switch
  • super bright
  • multiple modes
  • mode memory
  • SOS/beacon function
  • battery indicator
  • low-voltage protection
  • thermal regulation
  • battery included
  • adapter included


  • cool light
  • no built-in charger
  • no auxiliary LEDs
  • non-magnetic


Acebeam D20 / D20 photo 1.
Acebeam D20 / D20 photo 2.
Acebeam D20 / D20 photo 3.
Acebeam D20 / D20 photo 4.
Acebeam D20 / D20


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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.