I remember.
Yeh, the 3buk Rwhatever from MicroStore could put out a bit of decent light, and even though it was a bit bulky (sideswitch added almost an inch to the overall length), it was pretty easily moddable to take a 20mm TIR lens vs the come-with reflector, and a decent emitter-swap could put out some pretty good light.
It’s also a vampyre and could suck an alkaleak dry, albeit at lower and lower output.
Back to basics…
Ah, here we go… the R22.