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I see your bright LED headlight post, and I respond with matching LEDs, one sanded down a bit to diffuse the light.
(lemmy.world)
The top one is diffused, bottom one untouched and only shining forward like a laser.
This is obviously no special flashlight, but rather a simple example of how to fix/address the obvious problems with blinding LED headlights mentioned in this post..
Or maybe like purchase the Hayne's/Chilton manual.
Oh wait, they stopped making those around 2013 or so..