Sofirn SC21 Mini USB Rechargeable Flashlight Review

This little flashlight has me hooked! It’s a Sofirn SC21, and if you keep reading I’ll tell you all about it.

Sofirn SC21

All-inclusive Little Package

Sofirn SC21 package

Sofirn always puts together a nice presentation.

In the SC21 package is a user manual, a USB-C charging cable, a small packet with a lanyard and spare o-rings, and a rechargeable 16340 lithium battery. Very nice!


  • Length; 2.8″

    LH351D LED

  • Weight; 2.15 oz (w/battery)
  • LED; LH351D
  • Battery Acceptance; 1 – 16340 (included) or 1 – (disposable) CR123
  • Beam Distance; 135 meters
  • Impact Resistance; 1 meter
  • Water Resistance; IPX-8 (up to 2 meters underwater)
  • Driver; Constant Current Buck Driver
  • Body; Aerospace Grade Aluminum alloy — Type III hard anodized
  • Lens; Toughened Mineral Glass


  • Mode Memory
  • USB-C charging
  • Two User Interfaces
  • 5 lighting modes and 3 emergency modes
  • Low Voltage Warning
  • Low Voltage Protection

    Tail cap off

Modes and Output

The flashlight has two separate interfaces. Stepping and Ramping. When set to stepping which is the default, here are the modes you get.

  • Moonlight; (hidden) 1 lumen for 85 hours
  • Low; 10 lumens for 18 hours
  • Medium; 100 lumens for 4 hours
  • High; 400 lumens for 1 hour
  • Turbo; 1000 lumens
  • Strobe; 1000 lumens
  • SOS; 100 lumens
  • Beacon; 1000 lumens

Operating the Sofirn SC21

Once the battery is tightly secured, press the side switch. A holding press thereafter advances the modes. If it’s set to stepping, it incrementally goes from low to high. For moonlight, you need to perform a HOLDING press while OFF. For turbo, a double-press in required, which works whether it’s ON or OFF. A single press turns it off.

Operating in ramping mode is the same. Press and HOLD to advance from low to high (or high to low). Release the button at the desired brightness. Moonlight and turbo are still accessible in the exact same manner they are in stepping mode.

Changing Interfaces; Toggling from stepping to ramping (and vice versa) is very simple. From OFF, press the switch FOUR TIMES FAST! A short blink will confirm the change.

Battery Voltage Indicator; If the battery is reasonably charged, the switch indicator will be GREEN when the light is turned on. Once voltage starts to drop, the indicator will be RED when switched on. If the voltage drops below 3.0 the indicator will FLASH in RED.

Emergency Signaling Modes

From OFF or ON (in either interface) press the switch three times.

Strobe comes first, followed by SOS, and finally, Beacon. To advance from one mode to the next, do a HOLDING press. A quick press from any of the flashing modes returns to what it was doing when you activated them. If it was OFF, it’ll turn off. If it was on, mode memory will return it to the previous output.

Charging the Little Sucker

USB-C port

Battery charging

Charge complete






Once the included USB-C cable is connected, the switch indicator will blink in RED. It’ll turn to GREEN when the charge is finished.

Checking the Beam


Sofirn SC21 on high


Sofirn SC21 on medium


Sofirn SC21 on high


Sofirn SC21 on turbo


on low

on medium

Sofirn SC21 on high

on high

Sofirn SC21 on turbo






















Sofirn SC21 Is Just A Cool Flashlight

Before you say…”meh, I’ve seen lights like this before”…consider that the Sofirn SC21 (on turbo) is a tad brighter than others of this size, and it has TWO interfaces!

It seems to hold on to turbo nicely when activated…before a drop closer to high mode. Runtime on lower modes is very acceptable, and the battery voltage indicator reacts as it should as well.

Sofirn SC21 and 16340 battery

Good combination

Most people might not consider flashing modes a big deal…or even think of them as being all that useful. That’s easy to say until the day when you might actually NEED to use them! What’s unique (on a light this tiny) is that is has three! Adding “beacon” to the mix is something not seen too often.

Pick It Up

Putting a Sofirn SC21 into your pocket or gear bag is as easy as clicking here for Amazon Prime! And when you do, let me know how you like it.





Please follow Lightsngear and like us:

Leave a Reply

Your email address will not be published. Required fields are marked *