Acebeam TK18 CU Osram flashlight review

3 x Osram KW CSLNM1.TG LEDs
1900 lm output
20500 cd intensity
1 x 18650 Li-Ion battery

The Acebeam TK18 CU Osram flashlight released in 2019. It uses 3 x Osram KW CSLNM1.TG LEDs, TIR reflector and 1 x 18650 Li-Ion battery. The powerful emitter in this flashlight provides up to 1900 lm output, 20500 cd intensity, and a beam distance of 286 m.

Excited to find out if the Acebeam's flashlight is worth it? Keep scrolling!

Table of Contents

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. If you found an error or something lacking in the specifications for the Acebeam TK18 CU Osram, then tell us.

Acebeam TK18 CU Osram / TK18CUO

The TK18 CU Osram flashlight is a key tool in many situations. It's used for everyday tasks, outdoor adventures, emergencies, and professional work. TIR lens plays a significant role in shaping the beam pattern of the TK18 CU Osram flashlight. This light has 5 modes of lighting. The TK18 CU Osram's mode memory makes the user experience more seamless and intuitive. It has a strobe function, which is one of the most effective self defense tools available.

Acebeam TK18 CU Osram specifications

NameTK18 CU Osram
Rated 3 / 5 based on 1407 user votes.

Flashlights let you navigate in the dark. They help you find supplies and signal for help. They also provide comfort and security in tough times.

Acebeam TK18 CU Osram / 1

Body, materials, weight, colors

Weight124.5 g
Length105 mm
Body diameter23 mm
Head diameter25.5 mm

This 124.5 g flashlight is slightly heavier than most handheld flashlights. But, it is still at a reasonable weight. A balanced flashlight has even weight. It can be more comfortable to hold for longer and reduce hand fatigue. This flashlight comes in a sleek copper color option.

Acebeam TK18 CU Osram / 3

System, LED, lens, reflector

Emitter3 x Osram KW CSLNM1.TG LEDs
Color temperature6500 K
Switchmechanical rear

Osram is a German lighting manufacturer. It is a well-known and respected LED maker in the lighting industry. Color temperature is a characteristic of light. It is used to quantify the color appearance of light sources. The TK18 CU Osram's TIR lens is made of a single piece of transparent material. This material is typically acrylic or polycarbonate. Mechanical switches often offer tactile feedback. Users can feel a distinct click or resistance when they press the switch. The rear switch of the TK18 CU Osram is rugged and durable. It can withstand harsh conditions and repeated use.

Acebeam TK18 CU Osram / 2

Performance, flux, intensity, throw

Flux1900 lm
Intensity20500 cd
Throw286 m
CD/LM factor10.79

The 1900 lm output of TK18 CU Osram provides great flexibility. You can adjust the brightness to fit different needs. The TK18 CU Osram flashlight has 20500 cd. It can light objects at greater distances. The throw distance is the farthest distance the flashlight can light an object. The cd/lm factor is the candela-to-lumen ratio. It shows how concentrated a light source's output is.

Software, user interface, modes

Modes5 modes
Mode memoryyes
Ramping modeno

A flashlight's modes are different output settings or brightness levels. They can be chosen to meet different needs and preferences. The flashlight has mode memory. It remembers the mode you were using when the light was last turned off. It stays in that mode when you turn it on again. The TK18 CU Osram flashlight has a strobe function. It produces a rapid, repetitive flashing of light.

Features, battery, protections

Battery1 x 18650 Li-Ion battery
Battery indicatorno
Charger portno
Thermal regulationyes

The Acebeam TK18 CU Osram flashlight is powered by 1 x 18650 Li-Ion battery. The TK18 CU Osram doesn't have charger port. LVP (Low Voltage Protection) is designed to protect the battery. It stops over-discharging, which can reduce battery life or cause permanent damage. The built-in thermal control adjusts brightness output to prevent overheating. The flashlight has an IPx8 rating. It can withstand being submerged in water beyond 1 meter for a prolonged period. The manufacturer specifies this.

Accessories, package contents

Package contents2 x spare o-rings
spare rubber cover

With a clip, you can fasten the flashlight to a reachable spot. This ensures it is easy to get whenever you need it. When gripping the flashlight with the lanyard around your wrist, it gives a more secure hold. It also gives a more stable hold. Replacing worn or damaged O-rings helps a lot. It keeps up the flashlight's durability and performance.

According to the ANSI/NEMA FL1 Standard, we measure the performance of the TK18 CU Osram flashlight 30 seconds after switching on the light. The ANSI/NEMA FL1 2009 Standard is a set of flashlight performance guidelines.

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
  • TIR lens
  • tactical switch
  • adequate performance
  • super bright
  • multiple modes
  • mode memory
  • tactical strobe
  • low-voltage protection
  • thermal regulation
  • waterproof
  • clip


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


Acebeam TK18 CU Osram / TK18CUO photo 1.
Acebeam TK18 CU Osram / TK18CUO photo 2.
Acebeam TK18 CU Osram / TK18CUO photo 3.
Acebeam TK18 CU Osram / TK18CUO photo 4.
Acebeam TK18 CU Osram / TK18CUO

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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.
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