Sofirn SC21 Pro Review ($20 Shipped, 1100 Lumens, LH351D, USB-C)

Sofirn has a revision on their SC21, and they are calling it the SC21 Pro. The main difference is that it’s running Anduril 1 despite what the manual says. It still has the Samsung LH351D emitter as the non pro version, onboard charging, and retrains the 16340 battery. Thanks to Sofirn for sending this to me to review.


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Purchase the SC21 Pro at

Use the code “B1VJQER6” to save 30% until the end of August 2022


Packaging & Accessories

Packaging is Sofirns standard no-frills box. Inside the accessories include the light itself, a USB-A to C charging cable, pocket clip, lanyard, and Orings. The 800ma 16340 battery is optional but it only increases the price by about $2. Well worth getting in my opinion. The manual has a rather large misprint, saying that this light is running Anduril 2, when in fact it’s running Anduril 1. This makes the diagram and operating instructions different.


Construction & Design

The light is made from aluminum, and available in 3 colors, black, red, and the green I have here. The tail cap is magnetic and allows the light to tail stand even with a lanyard. The pocket clip mounts near the tail only and is non-captured. Knurling is a pretty standard diamond knurling of average grip. Threads are anodized, greased, and smooth. Internally there is a tail spring, upfront just a post in the head. There is easy access to the pogo pins to allow you to flash other firmware or different firmware versions if you want to. 

The head itself has the model name and brand engraved on the front and the “required” markings on the back near the charging port. I think the warning hot at the head is unnecessary even though yes it gets hot. The charging port cover is opposite the switch. Sofirn has used this port on other lights. In this case, I find it a little hard to get out of the way and for some reason a little tricky with the cables I had to keep charging. The port does seem to be set back a bit deep. At the top, there is a minimal smooth bezel, with the AR glass lens, and a light orange peel reflector underneath. 



Despite what the manual says this light is running Anduril 1. Sofirn tells me that there was a misprint in production and that the manual is created well in advance. Future versions may ship with corrected manuals. I don’t see Sofirn has posted a corrected manual on their website yet, which would be nice to see them do. I won’t go into depth here with Anduril because most of us know it by now. You have the option of a ramping mode and stepped mode, and all the goodies that Anduril offers. It is disappointing though that a light that came out in mid 2022 as a new design and a “Pro” model doesn’t ship with Anduril 2.


Size & Weight

For a 16340 light this isn’t the smallest in class, and is a bit on the longer side of things, more in line with my 18350’s almost instead of 16340. I measured the length at 73mm Max diameter at 22.5mm and weigh with the clip and battery at 2.11oz or 60g. It’s IPX8 water rated too. 



I enjoyed carrying this light around on some recent trips out of town. It’s nearly the same size in diameter as my Reylight Lan/Pineapples which I enjoy carrying typically. The light has a dual direction pocket clip that attaches at the back and rotates but is pretty tight. It was a little difficult to get it started when putting it in the pocket due to the tension, but this tension also creates security which is a good thing. It’s a decent pocket clip that’s very deep carry which I like. There is also a place at the tail to attach the included lanyard. 


LED & Beam

The light is using a Samsung LH351D in neutral white, and high CRI. I measured 4951k and 96CRI with my Opel meter. My sample didn’t have any green tinge you sometimes see with the LH351D. The beam has a large hotspot, minimal spill, decent for EDC, but they could have used a TIR here and saved some length most likely. There is PWM here, as you would expect with Anduril, but it’s not an issue. The button on the light does have a built-in green LED that can be configured in the UI for low, high, blinking, and off. In low it’s not a huge consumer of power. 

Due to the nature of Anduril, I won’t give specific output measurements since the light doesn’t have defined modes. I will say when I first started the light I saw 1044 lumens, and at 30 seconds I saw 028 Lumens.


Runtimes & Heat

I used the optional Sofirn 800mAh 16340 battery for my calibrated runtime tests. Turbo lasted here for about 4 minutes before stepping down significantly to about 250 lumens to cool off. As it cooled it did increase output. The total useable light was 35 minutes, but the light kept running in the absolute lowest mode to 1 hour. Max heat I saw during this time was 63.5C at about 5 minutes. Keep in mind this was after I calibrated the light and raised that temp threshold.



The light has built-in recharging via USB-C. I had no issues using USB-C to C or PD Chargers here. The port cover is good as mentioned but kind of large for this small light in my opinion. I tested with the optional 800mAh Sofirn battery. I tested it at 734mAh of capacity. The light charged from where it shut off to full in right at 1:06:00. Max charging rate was 0.9A which is slightly over 1C for the included battery. The shape of the charge curve here was pretty normal. 


Final Thoughts

There really isn’t much here that’s different on the SC21 Pro vs the non-pro. A 100-lumen difference isn’t going to be very noticeable to the eye. The biggest difference is the firmware where the SC21 Pro is running Anduril 1 which enthusiasts are going to like, and muggles are going to find confusing. 

They kept the exterior design which I think is solid, and the pocket clip here is pretty good. Best of all the LH351D returns in a neutral white and high CRI. Add into that it’s very affordable at $26 with the included battery before any additional discounts. It’s magnetic and available in 3 exterior colors, overall a pretty great value. Sofirn continues to bring in great budget options to the marketplace. In this physical size of light, you can certainly pay more for a light that I don’t think has as nice of an emitter or as good of UI. This would make a nice gift or entry into the EDC and flashlight worlds without breaking the bank.  


Purchase the SC21 Pro at

Use the code “B1VJQER6” to save 30% until the end of August 2022