That’s the one. Kissing cousin to the HS42 with similar red/spot/flood emitter array, but I use the '42 as a right-angle flashlight more than anything else.
In fact, I often handhold the '21 vs “wearing” it, as I can’t get arsed enough to stick it on the strap. Ironically, the strap is one that actually holds the light securely and doesn’t just suck, as other straps do, especially C-clamp type straps (vs rubber rings).
Putzing around the house, I use my TS10 for pretty much everything as it’s nice and floody, which to me is perfect for indoors. Ran down the cell, so it was charging, needed a light, so grabbed my '21 and used that.
The “wide spot” of the '10 is just about perfect for me indoors, but as far as the '21, spot was a bit too narrow and flood was a bit too wide, so spot+flood kinda complemented each other. Not ideal, but worked. But then again, my particular use-case is indoors, fairly close-in.
If you’re riding, the spot of the '21/'42 expands farther out, and flood gives you that nice wide “peripheral vision”, vs “tunnel vision” of spot-only. But unlike a reflectored light, it doesn’t have that hard cutoff around the “useful spill” periphery, as the flood is a nice wide blanket of light.
Ideally, the best way to figure out what’s best for you is to get a bunch of different lights, compare them, then pick. Who knows, maybe you actually prefer narrow-spot-only, or a wider spot, or a single TIR lens, or even a reflector.
