Olight/Keychain

Olight i3T EOS

Name: Olight i3T EOS
Brand: Olight
Price: 18 USD
Availability: InStock

Simple AAA tail-switch light that's always ready. The i3T is the no-fuss keychain light — twist on an AAA and go. Great for gifting to non-enthusiasts.

Beam profile

Balanced, about 29° wide. A usable hotspot with enough spill to see around it.

Estimated from 180 lm ÷ 900 cd — how this works

$18

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Specifications

Output: 180lm
Peak intensity: 900cd
Beam distance: 60m
Emitter: Philips Luxeon TX
Colour rendering: 70 CRI
Beam type: Balanced
Cell: AAA
Runtime: 40 min (high)
Modes: 2 Stepped
Interface: Simple
Water/dust: IPX8
Dimensions: 3.5 x 0.6 in
Weight: 1.1 oz
Warranty: Lifetime

Manufacturer figures, measured to ANSI FL1 where the brand states it.

Features

Pocket Clip Waterproof (IP67+)Tail Switch

What owners report

Olight i3T EOS/5 sources reviewed

A slim AAA pocket light that has quietly become one of the most-owned flashlights anywhere, and the appeal is straightforward: it weighs nothing, it runs on a battery you can buy at any petrol station, the tail switch works perfectly, and the moonlight mode is low enough to preserve night vision. Owners consistently report it surviving years of pocket carry.

The compromises are the format's. It's cool white with no high-CRI option, which reviewers would have welcomed. There's no lithium-ion support, and AAA cells aren't long-lived. Three specific design gripes recur: there's no keyring attachment on the light itself, so you have to use the pocket clip; the protruding tail switch means it can't tailstand; and there's no lockout at all — even unscrewing the tailcap doesn't disable it.

Consistently praised

Genuinely disappears in a pocket — light enough to forget
Runs on AAA cells you can buy anywhere
Excellent tail switch with a clean action
Moonlight mode low enough to preserve dark adaptation
Among the brightest dedicated AAA lights, with a durable aluminium body

Common complaints

Cool white with no high-CRI option
No lithium-ion support and AAA cells don't last long
No keyring attachment on the light — you have to use the clip
Can't tailstand because the switch protrudes
No lockout at all; unscrewing the tailcap doesn't disable it

Questions people ask

Can it run a 10440 lithium cell?: It isn't designed for one, and the higher voltage risks the driver. Treat it as an AAA-only light — that availability is the point of the format.
How do I stop it switching on in a bag?: You largely can't, which is the design's real flaw — there's no lockout and loosening the tailcap doesn't help. Carrying it clipped tip-down in a pocket is the usual workaround.
How do I put it on a keyring?: Through the pocket clip rather than the body — there's no dedicated attachment point. It works, but it's less secure than a purpose-built keychain light.
Is it bright enough to be useful?: For a AAA light, yes — it's near the top of the format. Set expectations at finding things in the dark and walking, not at lighting a field.

Sources (5)