My suggestion was to think outside the box and not look at bike lights, but look at regular "tactical" flashlights combined with a mounting bracket.
Bike lights (well mine, anyway) have a trapeziodal light pattern, so they have a more consistent illumination pattern when angled downwards. Plus side lobes to illuminate the kerb or verge.
I guessed that might be the case.
In the old days before LEDs, bike lights were dim and couldn't light up the road at all. Now, they could be almost as bright as car headlights. So it makes sense to have a beam pattern to avoid dazzling oncoming vehicles, as well as putting more of the light where it's wanted.
But a small LED light with the sole purpose of being seen might not need much in the way of a beam pattern, perhaps?