Olight I3S EOS 80lm In-depth review, Pros and Cons

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

The Olight I3S EOS (I3SEOS) 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.

The I3S EOS flashlight provides instant illumination at the touch of a switch. This immediate response is particularly useful in emergency situations or when you need instant visibility. This light has 3 modes of lighting. Lack of mode memory means you need to manually adjust the flashlight's settings each time you turn it on to get the desired mode. It has a strobe function, which is one of the most effective self defense tools available.

Olight I3S EOS (I3SEOS) pictures

Olight I3S EOS / I3SEOS photo
Olight I3S EOS / I3SEOS photo
Olight I3S EOS / I3SEOS photo
Olight I3S EOS / I3SEOS photo
Olight I3S EOS / I3SEOS photo
Olight I3S EOS / I3SEOS photo
Olight I3S EOS / I3SEOS

The specifications below are based on the official data published by the manufacturer, but we also take user reviews into consideration. If you found an error or something lacking in the specifications above for the Olight I3S EOS, then don’t hesite and signal the problem to us.

Olight I3S EOS (I3SEOS) specifications

Rated 4/5 based on 1212 user votes.

The I3S EOS flashlight enhance personal safety and security. It allows you to illuminate dark areas, identify potential hazards, or deter threats by shining light on them.


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. It's important to consider the length of the flashlight to ensure it fits comfortably in your desired carrying method. The aluminium body of I3S EOS has excellent thermal conductivity, meaning it can effectively dissipate heat generated by the flashlight's components, such as the LED or battery. The I3S EOS flashlight is available in assorted colors: black, blue, purple, red, yellow.


EmitterCree XP-G2 LED
Color temperature5000 K

The emitter of I3S EOS manufactured by Cree, a US-based LED manufacturing company. Cree is a well-regarded LED manufacturer known for its high-quality products and innovation in the lighting industry. Color temperature is a characteristic of light. It is measured in units called Kelvin (K) and is used to quantify the color appearance of light sources, particularly white light. The orange peel reflector of I3S EOS is designed to improve the beam characteristics of the flashlight by diffusing the light emitted from the light source.


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, it may not be sufficient for certain scenarios or individuals with specific requirements. 361 cd can provide a reasonable level of luminous intensity for many everyday lighting tasks. The throw is the calculated distance in meters at which the flashlight produces a light intensity of 0.25 lux. Candela per lumen (cd/lm) is a measure of a flashlight's beam intensity relative to its total luminous flux or output. It quantifies the concentration of light emitted by the flashlight in relation to the total amount of light produced.


Modes3 modes
Mode memoryno
Ramping modeno

Modes on a flashlight refer to different output settings or levels of brightness that can be selected to suit different needs and preferences. The I3S EOS is tactical strobe ready. The strobe light is disorienting to the person it is aimed at which makes it difficult for them to concentrate.


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 directly. You may need an external charger to keep your battery going. A protected battery is recommended as the light itself does not have low voltage protection (LVP). This light does not have temperature control feature. The "8" in the IPx8 rating indicates the highest level of protection against water ingress.


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. Instead of searching for compatible O-rings or waiting for replacements to arrive, having spare O-rings readily available allows for convenient and immediate repairs or replacements.

The performance of the Olight I3S EOS flashlight is measured according to the ANSI / NEMA FL1 Standard 30 seconds after switching the light on. The ANSI/NEMA FL1 2009 Standard is a set of flashlight performance guidelines.

Olight I3S EOS (I3SEOS) comparisons

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