Thanks for stopping by, Teppka!
The S21G and S21B look pretty similar to me.
The difference might be mostly cosmetic, but I’m just guessing.
I noticed that the emitter selection is slightly different.
EDIT1:
The XHP50.3 HI R70 is a great emitter, but it doesn’t throw very far (which may or may not be a problem.)
If you want more throw, I suggest ordering the light with an SFT40 emitter.
EDIT2:
You could ask your question in this thread and the owner of Convoy can probably answer your question.