Scientist, I made mine to run in mule configuration… no reflector or optic. This makes for a flood of UV light that I use for macro UV photography. I have several others for use in different things, including the Nichia 233 and the Z-Engine, as well as the Nichia 276 (I think) in a Jaxman made UV light with the black-out lens.
From the copper X6/333A…
The LED Engine Z series is mounted on a chunk of copper in a Solarforce L2M with an AHorton aspheric lens over it to spread the beam with no artifacts…
My Nichia 233 is also in an L2M, with an odd tall silicone lens (optic? It fits directly onto the emitter similar to a dome but it’s about a 1/2” tall) from Nichia that gives it more of a beam.
The L2M is an 18350 sized P60 drop-in light. One thing I favor them for is that the lens is held into the “head” of the light with a bezel up top. This “head” is actually an elongated bezel itself, designed to go over the P60 drop-in. So in the case of the aspheric, it’s mounted to the top of the long bezel with a SS bezel of it’s own and I can unthread the long bezel to focus the aspheric, if that makes sense.
The Jaxman has a reflector so it throws more of a beam than any of my UV lights, something like that might be better for searching while walking, over the closer up illumination of a mule for example.
Edit: Horrible memory… my Nichia 233 is in a Convoy S2 host, with short tube, using an 18350 cell. Remembered the silicone optic thing correctly though.