Sofirn IF22A Flashlight Review

The Sofirn IF22A flashlight uses a single 21700 cell. With the TIR optic and Luminus SFT40 emitter, it throws amazingly! Read on for testing!

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Official Specs and Features

Here’s a link to the Sofirn IF22A flashlight product page.

Versions

Technically there is only one version of the Sofirn IF22A flashlight. Also available is a version with a reflector instead of the TIR seen in the IF22A. That’s the IF22 (no “A”). Otherwise these two are the same.

Price

This thrower comes in at an astounding $33.99 without a 21700. Add the 21700 and you’re looking at $36.99. (For just $3 extra, absolutely buy the package with the single 21700 cell!)

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Short Review

What a fantastic light. Especially when you consider the price of under $34, the performance-to-cost value is astounding. That it can also be used as a powerbank is an extra and great feature!

Long Review

The Big Table

Sofirn IF22A Flashlight
Emitter:	Luminus SFT40
Price in USD at publication time:	$33.99
Cell:	1×21700
Turbo Runtime Graph	High Runtime Graph
LVP?	Yes, with switch warning
Switch Type:	E-Switch
Quiescent Current (mA):	0.09
On-Board Charging?	Yes
Charge Port Type:	USB-C
Charge Graph
Power off Charge Port	with cell: all modes without cell: no modes without body: lowest two modes
Claimed Lumens (lm)	2100
Measured Lumens (at 30s)	1457 (69.4% of claim)^
Candela per Lumen	69.1
Claimed Throw (m)	697
Candela (Calculated) in cd (at 30s)	1990lux @ 7.149m = 101705cd
Throw (Calculated) (m)	637.8 (91.5% of claim)^
Item provided for review by:	Sofirn
All my Sofirn 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

• Sofirn IF22A Flashlight
• Sofirn 5000mAh 21700 Cell
• Charge cable (USB to USB-C)
• 21700 to 18650 adapter
• Spare o-rings (2)
• Lanyard

Package and Manual

Just a simple box and there is no manual! I obtained a pdf version though, so here is that information.

Build Quality and Disassembly

For the price, this Sofirn IF22A Flashlight has superb build quality. Really, even for more money, this would be a reasonable light. Nothing is noteworthily bad regarding the build. In fact, there are many things to really like here!

Here’s the top-down view.

The head has a nice bit of knurling. Maybe this is a weird place for knurling since you won’t need to really unscrew the bezel. But it’ll help with removing the cell tube (or tailcap).

Both head and tail are removable, freeing the cell tube entirely. The threads are square-cut on both ends, anodized, properly lubed, and very smooth.

You can see the battery mark on the cell tube here too. More on that later!

This is just a bit of fun – the light doesn’t screw together without the cell tube, of course.

Here on the head are some cooling fins. They’re not incredibly deep, but you wouldn’t expect them to be on a tube light.

The tailcap is surprisingly bare – this light seems to want to be a dual switch light, but there’s just the e-switch. I like it very much in this setup, though.

Size and Comps

Dimension: 127.1 mm (length) × 42mm (head diameter)
Weight: 123 gram (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.

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.

Here’s the Sofirn IF22A Flashlight beside the Sofirn SP35. I use this light quite a bit!

And again, this shorty Sofirn IF22A is just for play. These parts don’t screw together. What a fun thrower size this is, though!

Retention and Carry

A pocket clip is included.

 

This clip is designed to attach in only one place, and that’s on the tailcap end of the cell tube.

It’s a “pretty deep” carry clip, especially with the overall size of the light.

Only one side has a lanyard hole. It’s just one hole, too, and so when tailstanding the lanyard will get in the way just a little bit. It’s very thin though, so that’s not the biggest problem.

As you can see above and below, the pocket clip has a lanyard hole, too.

A lanyard is included and attaches through a hole in the tailcap as seen below.

Power and Runtime

The Sofirn IF22A flashlight is a single lithium-ion cell light. The cell tube is 21700 sized, and that’s the cell that ships in the package.

Sofirn includes this plastic sleeve, which allows flawless use of a single 18650 cell, too.

The cell is installed into the Sofirn IF22A flashlight in the usual way – positive end toward the head.

Somewhere up above I said “more on this later.” Here’s more on this later. This cell tube is reversible. That’s great, actually except for the little cell direction marker. When reversed, the cell tube also indicates the wrong cell orientation. It’s not a big deal but does highlight that there are probably better places for this orientation marking.

Below you can see a few runtime tests. This Sofirn IF22A flashlight looks to have the ATR feature seen on the SP35, too – Advanced Temperature Regulation, which can be readily seen after the initial stepdown. The output is extremely active in managing the temperature around 44 degrees Celsius. The setting isn’t something that can be changed. (Being able to change this to 50°C or so would be great!)

These lower modes have a bit of a disappointing fade from their initial output level. That is decidedly not like the SP35 (which had flat output for the majority of runtimes).

I observed the switch providing a warning of low voltage in all three tests. In only two tests did the light turn off.

Charging

Built into the Sofirn IF22A flashlight is USB-C charging. This is a nice “current generation” charging method (better than micro-USB).

The charge port is in the head, just opposite the switch. These two items (switch and charge port cover) are different enough that you’ll not confuse them.

Sofirn includes a charging cable – USB to USB-C. It’s a surprisingly high-quality cable. I tested operation with USB-C to USB-C and that works (but looks to just be at 5V). Still, it works, which is good.

Here’s a charge graph – I logged first with USB to USB-C, since that’s the cable Sofirn supplies. Charging is very fast– nearly 3A at a peak, and fills the cell to around 4.18V. When topped off in a bay charger, the cell took exactly 1mAh more (ie, completely negligible).

Same story with C to C charging. Works fine, and peaks at nearly 3A!

While charging, the indicating switch will be flashing red. When charging is complete, the switch will turn green.

Powerbank

I didn’t test any of the powerbank features of the Sofirn IF22A except to see that they worked as expected. A USB-C output powerbank is a great option! (Again, for $36 or so, this is a ridiculous value.)

Without logging, I tested the current up to around 3.4A output (with significant voltage drop, of course.) However, it’ll stay in-specification well over 2A.

Modes and Currents

Mode	Mode Claimed Output (lm)	Claimed Runtime	Measured Lumens	Tailcap Amps
Turbo	2100	1.8h	1457	6.61
High	1000	2.25h	731	2.76
Medium	320	5.5h	181	0.87
Low	30	41.4h	46	0.31
Moon	1	400h	0.4	3.40mA

Pulse Width Modulation

We can see PWM on all but the lowest mode. It’s fast enough to be invisible, though.

Here you can see a “baseline” – a chart with almost no light hitting the sensor.

Then there’s the Ultrafire WF-602C flashlight, which has some of the worst PWM I’ve seen. It’s so bad that I used a post about it to explain PWM! Here are multiple timescales (10ms, 5ms, 2ms, 1ms, 0.5ms, 0.2ms) to make comparing this “worst” PWM light to the test light easier. That post also explains why I didn’t test the WF-602C at the usual 50us scale.

User Interface and Operation

The Sofirn IF22A flashlight is controlled by a single switch. It’s an e-switch on the side of the head.

This switch also has indicating features – below it’s seen indicating red for low voltage. Notably, the switch will indicate for 5 seconds after the light is turned on, as follows:

Green: remaining battery power is good
Red: remaining battery power is poor (less than 30%)
Red Flashing: recharge or swap cell immediately.

There’s a surprising amount of travel on this switch. It’s also quite proud

Here’s a UI table! Note that this user interface is just like the Sofirn SP35 and Sofirn SC21 which I reviewed previously. Whether Ramping is group 1 or 2 doesn’t really matter, so I’m leaving the UI table as it was for the SP35 and SC21. Switching between the two is the same, and the indication that groups were switched is the same too…

State	Action	Result
Off	Click	On (Mode Memory)
Off	Hold	Moonlight
On	Hold	Group 1: Mode cycle (Low, Medium, High only) Group 2: Ramp up
Any (except Turbo)	Double Click	Turbo
Turbo or Strobe	Click	Previous state
On	Click	Off
Turbo	Double Click	Moonlight
On	Click 4x	Switch between Group 1 and Group 2
Any	Click 3x	Strobe
Off	Click 4x	Lockout (blinks twice to confirm)
Lockout	Click 4x	Unlock (to mode memory)
Lockout	Click	Main emitter blink 2x to indicate lockout
Lockout	Hold	Momentary Moonlight

Why you’d want to double click from Turbo to get to Moonlight, I have no idea.

Group 2 (Ramping) is very similar to the above Group 1, except holding the switch will cause the light to ramp up. Loosening then holding the switch again within 1.5s will cause the ramp to switch directions. So it’s possible to ramp up or down. Double click still gets Turbo.

LED and Beam

The big deal on the Sofirn IF22A flashlight is of course the Luminus SFT40 emitter. It both has great output and great throw.

Throw from this emitter is aided by the TIR, which is clear and seemingly made for throw emitters.

With the flush bezel, light doesn’t escape when headstanding.

Here’s a better view of the emitter. That bezel does unscrew easily, allowing access to the mcpcb.

LED Color Report (CRI and CCT)

Beamshots

These beamshots are always with the following settings: f8, ISO100, 0.3s shutter, and manual 5000K exposure. These photos are taken at floor level and the beam hits the ceiling around 9 feet away.

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!

Conclusion

What I like

• Great deal at under $37.
• Very nice throwy beam profile
• Ramping option if you want it…
• But the stepped group is very smart too
• USB-C charging works great
• PWM is fast enough to be a non-issue
• The light functions as a powerbank too (and work very nicely)

What I don’t like

• 6500K
• Ramping is a little bit awkward with ramp speeds
• The sawtooth we see for temperature regulation may be a bit aggressive

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Notes

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