Originally Posted by
cyccommute
If you have a helmet mounted light, turn it off. I do the same in snowstorms. All you get from the helmet light is the 'Star Trek' effect. This is the only situation, by the way, where a helmet mounted light isn't that useful.
I still use the helmet light for visibility, so I can toss the light toward cars coming in from side streets. It doesn't help me see that well, but I believe it makes me more visible. I try to be obnoxiously visible as much as possible.