Olight I3S EOS flashlight review

Cree XP-G2 LED
80 lm output
361 cd intensity
1 x AAA battery

The Olight I3S EOS flashlight was released in 2013. It uses Cree XP-G2 LED, OP reflector and 1 x AAA battery. The powerful emitter in this flashlight provides up to 80 lm output, 361 cd intensity, and a beam distance of 38 m.

Wondering if this flashlight is a hit? Stay tuned!

Table of Contents

  • Olight I3S EOS 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.

Olight I3S EOS / I3SEOS

The I3S EOS is an impressive flashlight that offers both power and reliability. This light has 3 modes of lighting. The lack of mode memory means you need to adjust the flashlight's settings each time you turn it on. It has a strobe function, which is one of the most effective self defense tools available.

Olight I3S EOS specifications

Rated 4 / 5 based on 1486 user votes.

The I3S EOS flashlight allows you to light dark areas.

Olight I3S EOS / 2

Body, materials, weight, colors

Weight26.5 g
Length69.5 mm
Body diameter14 mm
Head diameter14 mm
Materialaluminium alloy

The I3S EOS 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 I3S EOS has a reputation for being durable and strong. The I3S EOS flashlight is available in assorted colors: black, blue, purple, red, yellow.

Olight I3S EOS / 4

System, LED, lens, reflector

EmitterCree XP-G2 LED
Color temperature5000 K

Cree is a US-based LED manufacturer. It is well-regarded for its high-quality products and innovation in lighting. Color temperature is used to quantify the color appearance of light sources. The designers of the I3S EOS incorporated an orange peel reflector to enhance the beam.

Olight I3S EOS / 5

Performance, flux, intensity, throw

Flux80 lm
Intensity361 cd
Throw38 m
CD/LM factor4.51

80 lm can provide a decent amount of brightness and be suitable for many everyday tasks. 361 cd can make things quite bright. It's enough for many everyday tasks. 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.

Olight I3S EOS / 1

Software, user interface, modes

Modes3 modes
Mode memoryno
Ramping modeno

A flashlight's modes are different output settings or brightness levels. Strobe mode on I3S EOS flashlight produces a rapid, repeated flashing of light.

Olight I3S EOS / 3

Features, battery, protections

Battery1 x AAA battery
Battery indicatorno
Charger portno
Thermal regulationno

The Olight I3S EOS flashlight is powered by 1 x AAA battery. The I3S EOS cannot charge batteries. You may need an external charger to keep your battery going. Use a protected battery, because this flashlight lacks low voltage protection (LVP). Flashlights without thermal protection may rely on other design elements to dissipate heat. The "8" in the IPx8 rating means the highest level of protection.

Accessories, package contents

Package contents2 x spare o-rings
AAA battery
carrying case
key ring

It comes with a battery. The battery must be fully charged before you first use your I3S EOS. Replacing worn or damaged O-rings helps a lot.

Official sitehttps://olightworld.com/

Conclusion, pros and cons

This Olight 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
  • warm light
  • OP reflector
  • multiple modes
  • tactical strobe
  • waterproof
  • battery included


  • moderated performance
  • low intensity
  • no mode memory
  • no battery indicator
  • no built-in charger
  • no LVP
  • no thermal regulation
  • no auxiliary LEDs
  • non-magnetic


Olight I3S EOS / I3SEOS photo 1.
Olight I3S EOS / I3SEOS photo 2.
Olight I3S EOS / I3SEOS photo 3.
Olight I3S EOS / I3SEOS photo 4.
Olight I3S EOS / I3SEOS photo 5.
Olight I3S EOS / I3SEOS photo 6.
Olight I3S EOS / I3SEOS


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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.