Sofirn SP31 v2.0 Flashlight Review

Official Specs
Short Review
Long Review
  What's Included
  Manual and Packaging
  Build Quality and Durability
  User Interface and Operation
  LED and beam
  Tint vs...
  Beamshots, Runtime, etc table.
  What I like
  What I don't like
Up Next


I’m waiting on amazon inventory to post another Sofirn review, so they sent out the SP31 V2.0 for me to wrap in the meantime.  Here’s that review.  It’s an 18650, dual switch tube light!  Read on!

Official Specs and Features


There are two packages.  One has a cell and a charger, the other doesn’t.  But there’s just one version of the light.


$28.99 just the light, $36.99 with the cell and charger (shown here).

Short Review

This is a good workhorse light, with a nicely rounded out package, and a well considered UI.

Long Review

What’s Included

  • Sofirn SP31 V2.0 Flashlight
  • Sofirn 3000 mAh 18650
  • Charger – Single bay li-ion
  • Charge cable
  • Lanyard
  • Spare o-rings (2)
  • Manual


Package and Manual

The light arrives in a very simple (but standard) Sofirn box.  There are no photos of the light, and the box is a fairly generic Sofirn box.

The manual covers the bases, and has useful diagrams.


Build Quality and Disassembly

As has been the case with the other Sofirn lights I’ve handled, this one is well built.  The anodizing feels good.  Nothing is sloppy about any part of the light.


There’s nothing exceptional about the build quality; it’s overall good.

I wasn’t able to remove the bezel, so this is as far as I went:


Both head and tail have thick springs, and the mcpcb is Sofirn branded.  The tail switch is held together by a brass retaining ring, which has indents for easy removable and maintenance of parts.


The cell tube is not reversible (threads are longer on one end).  The threads are also anodized, which means locking the light out mechanically requires a very short twist.


Officially 23.4mm(body diameter) x 133.5mm(length), and 72grams.

This light is much longer than the Convoy S2+, unfortunately.


The first line of carry is the pocket clip, which isn’t reversible.  It’s an ok clip.  Friction fit, and allowing only bezel down carry.  The whole tailcap sits out of the pocket using this clip, and I measure that at 32mm.  That’s much too much sticking out of the pocket.

The second option is the lanyard, which attaches on the tailcap.  It’s also possible to connect it on the pocket clip, but I’d stick with the tailcap.



The SP31 V2.0 is powered by a single Li-ion cell.  Sofirn includes a Sofirn branded 3000mAh 18650, which was used for all testing of this light.  Since the light has springs on both ends, any type 18650 should work just fine.


Here’s a few detail shots of the cell.  It’s a button top cell, and doesn’t mention any type of protection on the label.

Standard button top.

It’s a bit longer than the 65 moniker would indicate, but that’s not unusual.  Longer than the HG2, too.


I performed a runtime on turbo, and reset the light to turbo once during the run.  Turbo falls off quickly, from around 920 lumens to 840ish at 2 minutes.  Not too bad.  But very soon, the light steps down very hard, to the High setting.  Turbo can be reset, but the output doesn’t reach the initial output.  At around 3.1V, the indicating switch starts to flash slowly.  The light also switches to very low output, but doesn’t switch off.


A runtime on High is largely the same as Turbo, minus the turbo blip.  Temperature is never even a thought on the High setting.


Also included in the package is a single bay 18650 li-ion charger.  I didn’t test it for this review, but it’s the same as the one I tested in the C8F review.  It works fine for this application.

User Interface and Operation

There are two switches on the SP31 v2.0.  The tail switch is mechanical forward clicky.  The dome on the switch is big and grippy, and protrudes enough to prevent tailstanding.


The other switch is on the head, and is an indicating e-switch.  It’s nicely clicky, and has a very good action.  The indicator in the center of the switch can be green or red.


The switch is proud just a little.  Maybe 1.5mm or so.  (Could be a little lower, and be better.)


One notable thing about the indication on that switch is that it indicates the battery charge level for 5 seconds ever time the tail switch is turned on.

Green = “Enough power”
Red = “Short of power”
Flashing red = “running out of power.”

Here’s a UI table!

State Action Result
Off Click Tail Switch (TS) On (Mode Memory)
Off Click Side Switch (SS) No Action
Off Half press TS Momentary (Mode Memory)
On Click TS Off
On Click SS Mode Advance (L>H direction)
On Hold SS Strobe
Strobe Click SS Strobe Group Advance
Strobe Hold SS Return to previous mode
On Double Click SS No Action

That’s really a pretty simple double switch UI.  I like it too, because everything makes pretty good sense, and is intuitive.  Strobe is also not too in the way.


Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 1200 2h37m 865 2.42
High 500 3h41m 450 0.73
Medium 160 9h45m 139 0.17
Low 50 26h49m 47 0.04
Eco 5 291h 8

LED and Beam

Sofirn puts a Cree XP-L HI in this light.  The reflector is smooth, and fairly shallow.  The beam profile is mostly spot, but on higher modes, a little spill is noticeable.


Strangely there’s a pronounced yellow center to the beam, even at a bit of distance.

Tint vs BLF-348


Beamshots, Runtime, and Lux Measurements

Sofirn SP31 v2.0
Emitter Cree XP-L HI
Emitter Notes
Cell 18650
Runtime Chargetime N/A
LVP? Warning
Claimed Lumens (lm) 1200
Lux (Measured) 425 lux @ 5.896 m
Candela (Calculated) in cd 14774.2
Throw (Calculated) (m) 243.1
Throw (Claimed) (m) 200


Random Comparisons and Competitive Options….

There are many lights in this category.  The Sofirn competes well based on price, particularly with the “light only” option.


What I like

  • Full package for only $37 is not a bad deal
  • Solid build quality
  • Indicating side switch

What I don’t like

  • Beam tint has a big ol yellow spot in the center
  • Can’t tailstand

Up Next

Tomorrow, be sure to be back here ( for a non-flashlight related review!  I have a charger in for testing that might interest some of you photographers out there. And Fun Fund Friday is up in the air at the moment.  Stay tuned!


  • This light was provided by Sofirn for review. I was not paid to write this review.
  • This content originally appeared at  Please visit there for the best experience!
  • Whether or not I have a coupon for this light, I do have a bunch of coupons!!  Have a look at my spreadsheet for those coupons. It’s possible to subscribe and get notifications when the sheet is edited!!

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