Wurkkos WK03 Flashlight Review
The Wurkkos WK03 is a low-cost 18650-based flashlight that offers USB-C charging and a nice range of output! It makes a great gift!
Official Specs and Features
There’s only one version of the Wurkkos WK03 flashlight but it’s available with or without the 18650 seen in this review.
The Wurkkos WK03 flashlight sells for the remarkable price of $14.99 or $16.99 with cell. Buy the cell package!
I can’t even imagine how they make this light for such a low cost. It’s a nice one, too! The build quality is good and charging works great. A complete package USB-C charging flashlight for under $17 just seems crazy!
The Big Table
|Wurkkos WK03 Flashlight|
|Price in USD at publication time:||$14.99|
|Turbo Runtime Graph|
|Quiescent Current (mA):||0.01|
|Charge Port Type:||USB-C|
|Power off Charge Port||With or without cell or tailcap: one mode (medium)|
|Claimed Lumens (lm)||1800|
|Measured Lumens (at 30s)||1366 (75.9% of claim)^|
|Candela per Lumen||11.6|
|Claimed Throw (m)||217|
|Candela (Calculated) in cd (at 30s)||531lux @ 5.357m = 15238cd|
|Throw (Calculated) (m)||246.9 (113.8% of claim)^|
|Measured CCT Range (K)||6000-6600 Kelvin|
|Item provided for review by:||Wurkkos|
|All my Wurkkos 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).
- Wurkkos WK03 flashlight
- Wurkkos 3000mAh 18650
- Charging cable (USB to USB-C)
- Spare o-rings (2)
- Manual, etc.
Package and Manual
Build Quality and Disassembly
The build quality is great! This light punches WAY above $15.
In case you’re wondering, or maybe in case you’ve picked up on it already… Yes this Wurkkos WK03 and the Sofirn SC18 are nearly identical! Same specifications, same nearly everything, in fact. This Wurkkos has knurling though, while the Sofirn SC18 has ridges – which one you decide to purchase may come down to a preference between those two design features! (See photo comparison below.)
Size and Comps
Dimension: 101.5mm (length) × 24.7mm (head diameter)
Weight: 55g (without battery)
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).
Here’s the test light with the venerable Convoy S2+. Mine’s a custom “baked” edition Nichia 219b triple. A very nice 18650 light.
Also above is 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.
Here’s the Sofirn SC18 flashlight alongside a Wurkkos WK03. You might notice that they have similar designs! Performance is basically the same, too. Basically, the difference is that one has knurling (WK03) and one has ridges (SC18). I reviewed the SC18 already.
Retention and Carry
There’s a friction-fit pocket clip included for carrying the Wurkkos WK03 flashlight.
This is a pretty simple pocket clip but does attach securely and ships already attached.
Next up for carry is the included lanyard. This lanyard attaches through a hole in the tailcap.
There’s just one hole and this prevents clean tailstanding when the lanyard is in use.
No magnet or anything else is included.
Power and Runtime
The Wurkkos WK03 flashlight operates on a single lithium-ion cell. I have a package that had a cell included. It’s a 3000mAh button top and is a completely standard cell.
The cell goes into the light in the “usual way” (which is to say that the positive terminal of the cell goes into the light).
Unlike on the Sofirn SC18, there’s no silk-screened logo to indicate the battery direction (this is fine for me.)
Here are a number of runtime tests.
The Wurkkos WK03 flashlight also has built-in charging, by way of a USB-C port on the head.
Charging works great and only takes around 2.25 hours to complete.
C to C charging even works great, too! Again, for $15….
Modes and Currents
|Mode||Mode Claimed Output (lm)||Claimed Runtime||Measured Lumens||Tailcap Amps|
Pulse Width Modulation
Every mode uses PWM. It’s fairly fast PWM and I can’t say I noticed it during use.
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
Control of the Wurkkos WK03 flashlight is performed through a single e-switch. This is a soft switch and has an indication function in the center.w
The switch can indicate in green and red and flashing. When the Wurkkos WK03 flashlight is turned on, the switch will indicate the approximate battery level for around 5 seconds. Green means “good” and red means “poor” (or “low”). Flashing red means recharge immediately.
Here’s a UI table!
|Off||Click||On (Mode Memory)|
|On||Hold||Mode advance (LMH)|
|Turbo or Strobe||Click||Previous state|
|Lockout||Click||Main emitter flashes 2x to indicate lockout|
|Lockout||Click 4x||Unlock (to mode memory)|
|Lockout||Hold||Momentary moonlight mode|
LED and Beam
Sofirn is using a Luminus SST-40 emitter in the SC18. This emitter is coupled with a TIR, and offers a great beam profile.
LED Color Report (CRI and CCT)
CCT for this Luminus SST-40 is fairly cool at around 6500K. CRI is low too, at under 70.
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
- Very low cost!
- USB-C charging
- C to C charging works great
- Very nice beam profile
- Cell included for just $2 extra, still under $17
- Indicating switch
What I don’t like
- Very cool CCT
- Lockout goes to main modes (memory)
- No tailcap magnet
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