Ultrafire 5L2 4000lm flashlight review: Pros and Cons

5 x Cree XM-L2 LEDs
4000 lm output
22500 cd intensity
3 x 26650 Li-Ion batteries

The Ultrafire 5L2 flashlight released in 2017. It uses 5 x Cree XM-L2 LEDs, SMO reflector and 3 x 26650 Li-Ion batteries. The powerful emitter in this flashlight provides up to 4000 lm output, 22500 cd intensity, and a beam distance of 300 m.

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 Ultrafire 5L2, then tell us.

Ultrafire 5L2 / 5L2

The 5L2 is a powerful and reliable flashlight. It has impressive illumination and durable construction. It is an exceptional lighting tool, it works in many situations and environments. This light has 3 modes of lighting. The 5L2'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.

Ultrafire 5L2 specifications

Rated 4 / 5 based on 1394 user votes.

This Ultrafire flashlight is compact and handheld. It is easy to carry and maneuver.

Ultrafire 5L2 / 4

Body, materials, weight, colors

Weight499 g
Length305 mm
Body diameter38 mm
Head diameter60 mm
Materialaluminium alloy with HAIII hard-anodized finish

The flashlight is a bit heavy, its weight is 499 g. A balanced flashlight has even weight. It can be more comfortable to hold for longer and reduce hand fatigue. The aluminum bodies can be anodized. This adds a protective layer and a wide range of color options for flashlight bodies. The body of 5L2 flashlight treated with a Type III hard-anodized, anti-abrasive finish. This flashlight features a captivating black color.

Ultrafire 5L2 / 3

System, LED, lens, reflector

Emitter5 x Cree XM-L2 LEDs
Color temperature6500 K
LensAR coated glass
Switchmechanical rear

Cree is a US-based LED manufacturer. It is well-regarded for its high-quality products and innovation in lighting. Color temperature is a characteristic of light. It is used to quantify the color appearance of light sources. Flashlights use the smooth reflector when long-range light is important. This includes searchlights and thrower flashlights. The AR coating on the lens maximizes light transmission. This makes the flashlight more effective in darker environments.

Mechanical switches often offer tactile feedback. Users can feel a distinct click or resistance when they press the switch. The rear switch of the 5L2 is usually operated with the thumb or finger. This makes it easy to reach and use.

Ultrafire 5L2 / 1

Performance, flux, intensity, throw

Flux4000 lm
Intensity22500 cd
Throw300 m
CD/LM factor5.63

The 5L2 flashlight has 4000 lm. It will provide an exceptionally bright and powerful beam of light. The 5L2 flashlight has 22500 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.

Ultrafire 5L2 / 2

Software, user interface, modes

Modes3 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 5L2 flashlight has a strobe function. It produces a rapid, repetitive flashing of light. The SOS signal is commonly used in outdoor adventures or survival scenarios.

Features, battery, protections

Battery3 x 26650 Li-Ion batteries
Battery indicatorno
Charger portno
Thermal regulationno
Impact resistance1 m

The Ultrafire 5L2 flashlight is powered by 3 x 26650 Li-Ion batteries. The 5L2 doesn't have charger port. The Low Voltage Protection helps save the battery's capacity. It stops it from reaching a critically low voltage. Flashlights without thermal protection may be more susceptible to overheating under extreme conditions. The flashlight has an IPx8 rating. It can withstand being submerged in water beyond 1 meter for a prolonged period. The manufacturer specifies this. This flashlight has an impressive impact resistance rating of 1 m. It is built to endure accidental drops or impacts.

According to the ANSI/NEMA FL1 Standard, we measure the performance of the 5L2 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 Ultrafire 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
  • AR coated lens
  • tactical switch
  • strong flux
  • super bright
  • multiple modes
  • mode memory
  • tactical strobe
  • SOS/beacon function
  • low-voltage protection
  • waterproof


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


Ultrafire 5L2 / 5L2 photo 1.
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Ultrafire 5L2 / 5L2

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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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