Today I have in my hands a light from a brand I haven’t reviewed in a while – Olight!  This is the i5T EOS, an AA tactical two-mode light.  Read on for some testing and thoughts!

Official Specs and Features

Here’s a link to the official product page.


There are three versions of this light.  There’s a limited edition blue twist, and a limited edition copper.  And the regular black, which I have here.  Functionally I believe they’re all the same.


The version I have here is $29.95.

Buy yours through my referral link to!

Short Review

This is a nice little simple light.  I like the operation being just two modes and nothing else cluttering up the UI.  I don’t love the emitter – it’s a bit cool.  The switch is great.

Long Review

The Big Table

Olight i5T EOS
Emitter: Osram P9
Price in USD at publication time: $29.95 at
Cell: 1xAA
High Runtime
Switch Type: Mechanical
On-Board Charging? No
Claimed Lumens (lm) 300
Measured Lumens (at 30s) 327 (109% of claim)*
Candela per Lumen 4.5
Claimed Throw (m) 60
Candela (Calculated) in cd (at 30s) 67lux @ 4.715m = 1489cd
Throw (Calculated) (m) 77.2 (128.7% of claim)*
All my Olight reviews!
  • Measurement disclaimer:  I am an amateur flashlight reviewer.  I don’t have $10,000 or even $1,000 worth of testing equipment.  I test output and such in PVC tubes!!  Please consider claims within 10% of what I measure to be perfectly reasonable (accurate, even).

What’s Included

  • Olight i5T EOS Flashlight
  • Primary AA cell
  • Manual

Package and Manual

Build Quality and Disassembly

The build quality is good.  In particular the anodizing has a good feel to it.  The spirals on the body – I’m just indifferent about these.  They certainly don’t provide exceptional grip but they don’t hinder and the light is perfectly fine for holding anyway.

One thing I do like is the reeding on the tailcap.  Very helpful for unscrewing for cell swaps.

I was extremely surprised to note that the tail end of the light has so much copper.  I’m not sure what the logic here is.  It adds a nice bit of weight but the copper isn’t needed in order to carry the excessive current on High (to wit: the current on high isn’t excessive.)  So it basically seems like just a “nice touch” if you consider it a nice touch.

The threads are very nice, too.  Square cut and unanodized, and not too long.

One thing about this tailcap I am not a huge fan of is that the spring has to be twisted against the end of the cell.  This wouldn’t be a problem except the spring ends sharply and so when tightening the tailcap, the tip can grab at the cell, and “untwist” the spring.  That tip should be mashed flat.  Even a drop of solder would make it smooth enough to not grab the cell.

The head has a brass button.

Size and Comps

The i5T is 95mm long and 17.8mm in diameter.  The weight is 95g.

Retention and Carry

The included way to carry this light is the two-way friction fit clip.  This one’s blue.  I don’t typically love two-way clips, but this is by no means the worst iteration I’ve seen.  It’s fairly slim (noteworthy because bulk of these two-ways is one big complaint of mine).  There’s a lanyard hole on the shoulder.  (No lanyard is included).

The clip is two way but not reversible, but due to this it’s perfectly usable as a hatlight.

Power and Runtime

The i5T EOS runs on a single AA cell.  Lithium ion is not supported, but all 1.5V types are.  I tested exclusively with an IKEA LADDA.  Here’s a runtime on the higher mode.  Low voltage protection is not seen, but the output does drop down very low, which will be noticeable.  There’s a timed stepdown after 3 minutes, to “50%” which should be 150 lumens.

I didn’t do a runtime test on Low, because that’s estimated at 20 hours.  And it’s not from lack of willingness – it’s from lack of my computer’s ability to process an excel file that large.  So apologies there.

No LVP was seen when testing with a bench power, either.  The light does shut off at 0.4V but not electrically.

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
High 300/150/30 3m/25m/122m 327 1.50
Low 15 20h 18 0.07

Pulse Width Modulation

There’s something on Low, but not PWM.  Just sawtooth, and I didn’t find it to be noticeable.  It’s very fast.

For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor.  And here’s the worst PWM light I have ever owned.  Also one of the very first lights I ordered directly from China!

User Interface and Operation

There’s a single switch on the i5T EOS.  It’s a proud rubber cover mechanical clicky on the tail.  It has an extremely good feel.  It seems a bit unusual in that it seems to have hard sides with an internal soft stippled contact point.  The hard sides make the action very smooth, and the stippled center bit make it easy to grip.

Here’s a UI table!

State Action Result
Off Click Low
Off Tap Momentary Low
On (more than 2s) Click Off
Off Double click High
On (less than 2s) Click High

LED and Beam

I can’t find it in the literature but based on searches on the web this is a Osram P9 emitter.  The light uses a TIR and has a beam with mostly spot, and a little spill.

These beamshots are always with the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure.

Tint vs BLF-348 (Killzone 219b version)

Test light is on the left!

I compare everything to the Killzone 219b BLF-348, because it’s inexpensive and has the best tint!


What I like

  • Good build quality
  • Very simple UI
  • Switch cover is surprisingly great
  • Reeding on the tailcap makes for easy grip
  • Copper bit in the tailcap? is probably relevant for some electrical reason but it adds a nice heft to the light, in any case.

What I don’t like

  • Osram P9 – there’s probably a better choice for this light than the P9.
  • An extra mode wouldn’t hurt my feelings


  • This light was provided by Olight for review. I was not paid to write this review.
  • This content originally appeared at  Please visit there for the best experience!
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3 thoughts on “Olight i5T EOS Flashlight Review”

  1. Hello I like to read your reviews, normally they answer my doubts. Because I’m interested in buying this one I have a question, when you say you don’t see any LVP I wonder if this flashlight don’t behave like the i3t eos? i.e. , around 0.9v start to flicker like PWM in some bad flashlights. Then the frequency starts to drop until around 0.8v where that frequency is really low and you can see it almost like a “beacon” mode.

    1. It’s possible, but I did not notice this while using it (including testing it on bench power well below 0.9V.)

  2. Pingback: Olight i5T EOS Brass Flashlight Review - ZeroAir Reviews

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