Wuben G2 Keychain Flashlight Review

Wuben G2 Keychain Flashlight Review

Wuben has released the G2, a keychain flashlight offering USB-C charging as well as a host of other neat features. Read on for some testing!

Official Specs and Features

Here’s a link to the Wuben G2 keychain flashlight product page.


There’s just one “version” but it’s available in three body colors: black, blue, and green.  Wuben was kind enough to send all three for this review, so all the colors can be seen here.


The listed price for the Wuben G2 keychain flashlight is $22.99, but I think the street price is under $20. Here’s a coupon code for 20% off, too!


Short Review

I’m surprised by how solid this little Wuben G2 keychain flashlight feels in hand.  That makes it feel “not cheap,” despite actually being low cost. The downside of this solid nature is that the battery is not replaceable. It’s charged via USB-C though, which is good. The output is respectable too, and I quite like the beam profile. All in all, if you need a keychain light and are ok with the CRI and CCT this light offers, it’s a good choice for $20.

Long Review

The Big Table

Wuben G2 keychain flashlight
Emitter: Osram P9
Price in USD at publication time: $22.99
Here’s a 20% off coupon, too:
Cell: Internal
Turbo Runtime Graph High Runtime Graph
Switch Type: E-Switch
Quiescent Current (mA): ?
On-Board Charging? Yes
Charge Port Type: USB-C
Charge Graph
Power off Charge Port Lowest three modes only
Claimed Lumens (lm) 500
Measured Lumens (at 30s) 321 (64.2% of claim)^
Candela per Lumen 4.4
Claimed Throw (m) 47
Candela (Calculated) in cd (at 30s) 107lux @ 3.464m = 1284cd
Throw (Calculated) (m) 71.7 (152.6% of claim)^
Claimed CCT
Measured CCT Range (K) 6000-6700 Kelvin
Item provided for review by: Wuben
All my Wuben reviews!

^ Measurement disclaimer:  Testing flashlights is my hobby. I use hobbyist-level equipment for testing, including some I made myself. Try not to get buried in the details of manufacturer specifications versus measurements recorded here; A certain amount of difference (say, 10 or 15%) is perfectly reasonable.

What’s Included

WWuben G2 keychain flashlight what's included

  • Wuben G2 keychain flashlight
  • Charging cable (USB to USB-C)
  • Pocket clip
  • Manual

Package and Manual

Build Quality and Disassembly

WWuben G2 keychain flashlight

As I already said, this little light feels quite solid. The three colors that Wuben offers here are nice and bright and sort of festive.

WWuben G2 keychain flashlight back side

The three bodies are the same though – no emitter (or otherwise) differences between them.

WWuben G2 keychain flashlight plastic piece off

Since the light does have a magnet in the tail end (at right, below), these lights stack and stay together fairly nicely. That’s just anecdotal fun; you obviously would not use them this way, or really ever carry them this way. I just like stacks.

WWuben G2 keychain flashlight stacked WWuben G2 keychain flashlight lined up WWuben G2 keychain flashlight delicious G2 sandwich

Size and Comps

Officially 58.5mm x 27mm, and weight of only 28g.

If the flashlight will headstand, I’ll show it here (usually the third photo).  If the flashlight will tailstand, I’ll show that here, too (usually the fourth photo).

WWuben G2 keychain flashlight in hand

Here’s the test light with the venerable Convoy S2+.  Mine’s a custom “baked” edition Nichia 219b triple.  A very nice 18650 light.

And here’s the light beside my custom engraved TorchLAB BOSS 35, an 18350 light.  I reviewed the aluminum version of that light in both 35 and 70 formats.

WWuben G2 keychain flashlight beside the TorchLAB BOSS 35 (custom engraved)

Retention and Carry

A few options are included for carrying the Wuben G2 keychain flashlight. First is this split ring. You can see below how the split ring is repelled by the magnet (which is on the split ring end). As such, the split ring always sticks out (as seen at right.) No problem there of course, just an interesting note.

Next up is the pocket clip. This is a fully plastic affair, which doesn’t fully hug the G2. It clips into this groove seen on the body in the notch on the sides. So it really squeezes the body more than hugging the body.

WWuben G2 keychain flashlight pocket clip

This split ring is on a plastic attachment that can twist off, too. Below you can see how the clip looks from the front. It doesn’t get in the way of output.

WWuben G2 keychain flashlight split ring WWuben G2 keychain flashlight pocket clip

Removing that attachment does shorten the light by 5mm or so.

WWuben G2 keychain flashlight plastic piece off

And there’s the magnet, which I mentioned above, too. The magnet holds the light fairly well but doesn’t provide a super strong attachment.

Power and Runtime

As stated, the G2 has a built-in battery. Wuben states it as a 280mAh battery, and it is charged via USB-C.

WWuben G2 keychain flashlight indicator LED

Here are a few runtimes. Having used all three lights a good bit, I tested different modes with different bodies – I was confident that the performance was the same among them. So any runtime is representative of all the G2s. During use, the indicator seen above indicates the charge level for 5 seconds as follows:

Blue: ≥90%
Blue blinking: 90% to ≥40%
Red: 40% to ≥15%
Red blinking: 15% to ≥ 0%


USB-C is used for charging the Wuben G2 keychain flashlight. This charging port is on one end and is beside the e-switch. These two feel quite similar but being so close together it’s not really a problem to mistake one for the other. Switching to the other (if you miss the switch the first time) doesn’t really change how you’re holding the light. So no real problem there.

The charge port cover doesn’t seat quite as firmly as I’d like. It fits well, but more or less just lays over the charging port.

While charging, the charge indicator is red. When charging is complete, this indicator turns blue.

C to C charging does not work.

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 500/200 30m 485 Initial
321 at 30 seconds
High 200 35m 204
Medium 65 1.5h 65
Low 15 6h 12
Moon 1 70h 1

Pulse Width Modulation

Every mode uses PWM.  That’s not great at all, but the PWM is fairly fast and I wouldn’t say it’s noticeable.

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, which is 50 microseconds (50us). 10ms5ms2ms1ms0.5ms0.2ms.  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

A single e-switch controls all the operation of the Wuben G2 keychain flashlight.

WWuben G2 keychain flashlight e-switch

This switch has very low action but is still clicky.

WWuben G2 keychain flashlight e-switch actuation

Here’s a UI table!

State Action Result
Off Click No Action
Off Hold On (Mode Memory)
On Click Off
On Hold Mode Advance (Moon, Low, Medium, High only)
Any Double Click Turbo

The manual hints at them but doesn’t cover any blinky modes. There is also no shortcut to Moon from off.

LED and Beam

Wuben uses an Osram P9 in the G2. That emitter is coupled with one of those very flat TIR optics often used by Fenix (and Wuben).

WWuben G2 keychain flashlight emitter and TIR

WWuben G2 keychain flashlight on

LED Color Report (CRI and CCT)

The CCT ranges from around 6000K to around 6700K, which is cool to very cool. The CRI is low too, at around 70 or so. This is no surprise coming from the Osram P9.


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

Tint vs BLF-348 (KillzoneFlashlights.com 219b version) (affiliate link)

I keep the test flashlight on the left, and the BLF-348 reference flashlight on the right.

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


What I like

  • Light is tiny!
  • Good output
  • Standard TIR optic, so despite being small it’s still quite flashlight-like
  • USB-C charging

What I don’t like

  • Battery isn’t replaceable
  • Cool white
  • Low CRI


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