The Olight i5T EOS flashlight, an AA tactical two-mode light. Read on for some testing and thoughts and photos of those blue accents!
Official Specs and Features
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 OlightStore.com!
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.
The Big Table
|Olight i5T EOS Flashlight|
|Price in USD at publication time:||$29.95 at olightstore.com|
|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).
- Olight i5T EOS Flashlight
- Primary AA cell
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|
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. Also, here’s the light with the worst PWM I could find. I’m adding multiple timescales, so it’ll be easier to compare to the test light. Unfortunately, the PWM on this light is so bad that it doesn’t even work with my normal scale, with is 50 microseconds (50us). 10ms. 5ms. 2ms. 1ms. 0.5ms. 0.2ms. In a display faster than 0.2ms or so, the on/off cycle is more than one screen, so it’d just (very incorrectly) look like a flat line. I wrote more about this Ultrafire WF-602C flashlight and explained a little about PWM too.
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!
|On (more than 2s)||Click||Off|
|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)
I keep the test flashlight on the left, and the BLF-348 reference flashlight on the right.
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.
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