Patience — accumulate ideas, see who might be interested in trying them.
Knurling, cutting metal — texture — what feels good? What feels too rough? (I know there are some lights with sharp enough edges I’ve taken a file to them to smooth them out.
Does some texture get dirty too fast? Is any particular texture easier to clean?
How about anodizing — versus black paint (grin).
Flat flashlights? I still have a few “Hi-Gain” 4xAAs with Fresnel lenses.
Take a power bank maybe? add a flat metal heat sink with a standoff, and emitter(s) and Fresnel lenses ….
Crux asked about Fresnel lens lights here: Has anyone had success with a Fresnel lens? How 'bout this one...
Lots of sources now for Fresnel lenses, for example
