This is where people might explain to some other people that if your light is that bright and is aimed at oncoming cars you have a huge problem whether it is flashing or not.

If oncoming drivers are blinded by your light, your light is not aimed down and to the right .... which is where you will be riding your bike, unless you are riding head-on into traffic. If your light is aimed up and left---into the eyes of oncoming drivers---then your light is pretty much worthless to you as a rider and also a hazard to others ... whether it blinks or not. if any rider is dense enough to shine a strobe at oncoming drivers .... Darwin.

So long as your light is aimed at the pavement where you will be actually riding your bike, drivers shouldn't have an issue .... and if you have a strobe so powerful that it blinds drivers in the other lane even though it is pointed away ... then likely it blinds You too, so you won't be able to ride your own bike.

During the day a flashing headlight is definitely more visible, based on my own encounters with cyclists using daytime headlights..

In any case, I find a flashing front light irritating in the dark, because it causes my eyes to have to constantly readjust .... even when paired with a steady beam. I favor a solid beam--or two, depending on speed and conditions---up front and a blinking rear, but as [MENTION=15039]jgwilliams[/MENTION] notes, it is easier for drivers to judge distance from a steady tail light, so ideally I would run both. i don't, and so far no one has killed me .... but two red lights, one flashing and one steady, would seem to be optimal.

(Logically, two flashing rear lights would also be good for judging distance, as the apparently changing relative distance between the lights would give the brain the information it needed about distance closing speed.)