There is a Long post about bright lights here

Post 139 mentions a Specialized Flux Expert light that is designed to prevent blinding people. As bike lights get to be as bright as car lights (but with a point source), directed beams is the next logical choice.

One of the problems is that it is nice to put the brightest point of the light near the horizon to get adequate look-ahead. However, the cheap lights just puts a broad spot which then has too much upward bleed, and thus blinding people.

I was on a center island MUT yesterday with lots of short lamp posts, and traffic on both sides. I found all the lights very distracting. I don't like blinking front lights, but certainly would consider one for these circumstances.