[Review] Wurkkos FC11 ( Samsung LH351D 90CRI, 1 x 18650 ) || Output Measurement, Power Regulation Graph, Wall Beamshots

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bilakos10
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[Review] Wurkkos FC11 ( Samsung LH351D 90CRI, 1 x 18650 ) || Output Measurement, Power Regulation Graph, Wall Beamshots

The flashlight was sent to my by Wurkkos for review.
Here's the product's page for more info: Wurkkos FC11



T
he flashlight comes inside a carboard box.



The following accessories are included:

  • USB-C charging cable.
  • Wrist lanyard.
  • User manual.



The FC11 comes with a satin black anodization. The overall fit and finish is excellent.



It's operated by an e-switch mounted in the lower part the head.
A blue metal ring keeps the e-switch assembly into place.
Additionally, the e-switch incorporates an LED that's used to indicate the battery's charge - both during normal use and during charging.

 

Opposite to the e-switch, one finds the USB-C charging interface of the flashlight.
The charging port is sealed with a rubber flap.

 

The head houses an orange-peel reflector and the LH351D emitter. I choose to get the LH351D 5000K 90CRI variant.
The centering of the LED is perfect.



The head can be taken apart relatively easily - Some traces of glue were observed in the threads, but I managed to crack it open without any special tools.



The Samsung LH351D emitter sits onto a copper MCPCB.
Plenty of thermal paste seems to be in place.



A few thick heat-sinking grooves are part of the head's design in order to improve the flashlight's thermals.



The driver of the FC11 seems to be press fit / glued in the rear of the head.
A cooper spring is used as the positive terminal. 



The rear-end of the flashlight is flat, which allows it to tailstand.
A small loop is also in place in order to allow for the installation of a lanyard.



The tail houses a thick copper spring as well as a very strong magnet.



The tail's threads are very clean and arrived adequately lubricated.
Thanks to their anodization, the FC11 can be mechanically locked out.



The head's threads are completely similar to the tail's threads.
This means the the tube can be rotated, and thus change the orientation of the pocket clip.



The pocket clip is pretty strong and is detachable from the body.



A Wurkkos branded 18650 battery is also included in flashlight's bundle.



The battery seems to have a medium internal resistance.
My discharger reported around 150 mΩ.



While charging a fairly depleted cell, I recorded a maximum of 1A of input current.
Of course, the input current decreased as the battery got closer to its full capacity.



It's worth noting that the included USB-C cable is one of the most robust I've seen included in a flashlight bundle.
I went ahead and measured its resistance which turned out to be 0.22Ω, which is very good.



User Interface

The firmware of the Wurkkos FC11 supports both stepless dimming and normal stepped modes.
Here's all the supported actions.

Turrn on/off: Single press.
Mode cycle (stepped modes): Long press ( Eco > Low > Mid > High > Eco ).
Ramp up / down (stepless dimming): Long press. The ramp direction changes if another click is invoked after the initial long-press click. 
Turbo: Double press from anywhere.
Strobe: Triple press from anywhere.
Eco: Long press (1 sec) while off.
Switch between stepless dimming and stepped modes: Long press (3 sec) while off.
Electronic lock / unlock: Quadruple press while off.

Thanks to the indicator LED in the e-switch, the FC11 incorporates Low Voltage Warning.
Additionally, the Low Voltage Cutoff will completely turn off the power once the input voltage is < 2.8V
Mode-memory is present.

Output Measurements

Here's my output measurements for each mode along with the respective current draw.



As can be seen, the Wurkkos FC11 pushes 1314 lumen in Turbo at turn-on.
The manufacturer's output ratings seem precise, which is always a good thing.

The standby drain was measured at 43μΑ which is very good.

Power Regulation

Here's a graph I created to visualize the power regulation of the FC11.



As can be observed, the current draw of the flashlight's modes are linearly proportionate to the input voltage.
In the future, it would be cool to see an updated FC11 model with some kind of regulation present at the lower modes.

Wall Beamshots and PWM

Here's a GIF demonstrating the mode spacing of the Wurkkos FC11



No sings of PWM is visible at any mode.



Overall I think that the Wurkkos FC11 is a great flashlight for its price range.
I'll definitely be adding it in my daily EDC rotation laughing


Edited by: bilakos10 on 04/11/2021 - 15:01
bilakos10
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Added some wall beamshots to demonstrate the mode spacing.
Also included a “light-painting” picture with the FC11 to verify that no PWM is present.

Outdoor beamshots should be available in the a couple of days Smile

SammysHP
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bilakos10 wrote:
Also included a “light-painting” picture with the FC11 to verify that no PWM is present.

It uses 20 kHz PWM. Probably too fast to be visible at that speed of movement in the photo.
bilakos10
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SammysHP wrote:
bilakos10 wrote:
Also included a “light-painting” picture with the FC11 to verify that no PWM is present.
It uses 20 kHz PWM. Probably too fast to be visible at that speed of movement in the photo.

Oh thank you for the info!
It makes total sense, as the power graph does indicate that the FC11 is using a FET driver, so some kind of PWM should be in place.

I shall rephrase my original sentence to ‘ No PWM is present visible’.