Here are a few more examples of the excessive use of light:

SUVs and trucks raised up so that their headlights are at mirror level of normal cars, and whos low beams are blinding bright when they come up behind you at a stop.

Outdoor porch lights left on all night and illuminating all the neighbors, at face level, so that there's always a light in your face at night.

Drivers who don't dim their brights when they approach.

Cyclists who leave their helmet mounted lights on all the time, and on group rides.

Those highly directional car headlights with a blueish tint, with very sharp cutoff to the beam pattern, and that bounce (distractingly, like a strobe) as they hit things in the street.

"Security" lighting of everything, all the time. Light doesn't equal security. Light only helps an observer identify a breach of security. If nobody's watching, what good is the light?

I propose that there's a limit to how much light is reasonably necessary for bicycling. Plenty of accidents happen in full daylight. As LED technology quickly lowers the barrier to use of high powered headlights, we have to have this discussion. Thanks for starting this thread.