Acebeam PT40 LH351D flashlight review

6 x Samsung LH351D LEDs
3000 lm output
2500 cd intensity
1 x 18650 Li-Ion battery

The Acebeam PT40 LH351D flashlight was released in 2020. It uses 6 x Samsung LH351D LEDs, TIR reflector and 1 x 18650 Li-Ion battery. The powerful emitter in this flashlight provides up to 3000 lm output, 2500 cd intensity, and a beam distance of 100 m.

Excited to learn if the PT40 LH351D lives up to expectations? Read on!

Table of Contents

  • Acebeam PT40 LH351D 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 PT40 LH351D / PT40LH351D

The PT40 LH351D is a powerful and reliable flashlight. It has impressive illumination and durable construction. TIR technology minimizes hotspots, dark spots, and irregularities in the beam of PT40 LH351D. The lack of mode memory means you need to adjust the flashlight's settings each time you turn it on.

Acebeam PT40 LH351D specifications

NamePT40 LH351D
Rated 4 / 5 based on 1326 user votes.

The PT40 LH351D flashlight allows you to light dark areas.

Body, materials, weight, colors

Weight95 g
Length126.8 mm
Body diameter24 mm
Head diameter32.8 mm
Materialaluminium alloy with HAIII hard-anodized finish
desert tan

The PT40 LH351D is small, compact, and designed for ultra-portability. The length of a flashlight can affect how it feels in your hand and how you can grip it. The aluminium body of the PT40 LH351D has excellent thermal conductivity. The HAIII coating is uniform and attractive. Factors can influence the color choice of the flashlight body.

Acebeam PT40 LH351D / 1

System, LED, lens, reflector

Emitter6 x Samsung LH351D LEDs
Color temperature6000 K
Switchmechanical side

The emitter of PT40 LH351D manufactured by Samsung, a Korean LED manufacturer. Warm, white light is generally more comfortable. The TIR lens of the PT40 LH351D can reduce light loss, it captures and redirects much of the emitted light. Mechanical switches are usually robust.

Performance, flux, intensity, throw

Flux3000 lm
Intensity2500 cd
Throw100 m
CD/LM factor0.83

With 3000 lm, the PT40 LH351D flashlight will offer a brighter and more powerful beam of light. The PT40 LH351D flashlight has 2500 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.

Software, user interface, modes

Modes1 mode
Mode memoryno
Ramping modeno

Features, battery, protections

Battery1 x 18650 Li-Ion battery
Battery indicatorno
Charger portno
Thermal regulationyes
Impact resistance1.5 m

The PT40 LH351D flashlight's power source is 1 x 18650 Li-Ion battery. The PT40 LH351D 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 IPx6 rating indicates that the flashlight has a protection against water jets.

The flashlight's impact resistance is its ability to withstand physical shocks. It can accomplish this without sustaining any damage. The PT40 LH351D is magnetic so that the flashlight can be attached to some metallic surfaces.

Accessories, package contents

Package contentsclip

The clip is very helpful, it lets you quickly access your flashlight while keeping your hands free for other tasks.

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
  • body color options
  • TIR lens
  • side switch
  • low-voltage protection
  • thermal regulation
  • waterproof
  • magnetic
  • clip


  • cool light
  • low intensity
  • no mode memory
  • no battery indicator
  • no built-in charger
  • no auxiliary LEDs


Acebeam PT40 LH351D / PT40LH351D photo 1.
Acebeam PT40 LH351D / PT40LH351D photo 2.
Acebeam PT40 LH351D / PT40LH351D


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Updated: May 10, 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.