No one remembers the Hurkins Orbit headlamp?
Similar design, but 2 different types of LEDs (front vs sides), and a finger-dial thingy (like a tuning knob on a stereo) to dial in the brightness you wanted.
Worked pretty nicely except for a yellow strip of light at the top/bottom edge
Someone kinda poopooed it for not being waterproof, and I get that, but for around the house, it was the ultimate mule.
Ah, found it…
And yeah, cutting a striplight into a dog-collar (just enough to glow, not light up all of creation) would be pretty good.