Sep 30, 2020

Convoy S21B and S2+

I ordered these lights at the beginning of the month but they took forever to arrive.

The package came from China but actually landed in the US within 4 days. However, at that point, the carrier messed up and routed it to Utah, Nevada, back to CA, then bounce around in CA for a few days before arriving at my door. Sigh...
Anyway, what matters is they're finally here.

I originally wanted a Convoy S2+ with the high powered SST40 emitter (1800 lumens vs 1000 on a typical S2+) so I can add my brass 18350 battery tube to it. However, when it arrived, I found that the thread on the new S2+'s are different now so the brass tube doesn't fit. Doh!

I also wanted a 21700 version so I ordered the S21A (2300 lumens). However, just after I ordered, I learned about a new Convoy flashlight called the S21B. I contacted Simon (manufacturer of all Convoy lights) to switch to the new light. He did it and threw in 2 lighted tail cap switches to boot. 😍

Lowest emitter modes

I love the S21B but the S2+ (at 1800 lumens) is no slouch. Both are very bright.

Brightness comparison
Camera fixed to F1. 5, 1/60s, ISO 400, 5000k WB
*Note: the S2+ high and max mode are dimmer  because I was using a low battery (my bad). 
With fully charged battery, its high and max modes are close to the S21B's.

Beam on max brightness (camera auto-compensated)
Left is S21B vs S2+ on right
This is with 2x 5500 lumen LED shop lights in the background so the beams are much brighter than this picture.

On max, the head on both lights warm up within 40 seconds.
The S21B's black aluminum body feels like it's rubber coated but it's just matte anodized aluminum. Very different design from S2+. The stainless steel bezel is a nice touch although I wish it was a bit larger to create more of a contrast against the rest of the body.

Beautiful emitters & AR glass

Said emitters in lowest mode

Pretty close in size. S21B on top accepts 21700 battery (also 18650) while the S2+ takes 18650. 
That gap between tail cap and battery tube bothers me a bit, but that's my OCD talking 😂

Both are SST40 5000K so they look very similar. This emitter is a bit green on lower power but they're bright white on high or max.

The 2 new lights flanking my current favorite Convoy light: Sand S2+ with 18350 brass tube.

I modded the S2+' s tail switch to a blue lighted switch then changed it to orange. This is on 20% remaining battery so it's dim. 

Here's a pic of it on fresh battery vs S21B (which will get the blue button treatment soon)

ZEROSVN Tech Enthusiast


  1. Hi, great review! I just have a question as I am interested in ordering the s21b as well. Does the lighted switch made for the s2+ work with the s21b?

    1. Yes but for me, the screw at the tailcap of the S21b was too hard to take off so I didn't put the lighted switch on it. I'll try again sometime in the future.