I agree that this is probably the most dangerous situation at night. I look at this issue from the motorist's viewpoint. I assume that you were nearly t-boned by motorists failing to see you as they pulled out from sidestreets or driveways. By the time they see your sidelights, it is probably too late for them to avoid you. I think you need brighter headlights, so motorists will see you before they pull into your lane. I wonder if the helmet mounted light is always pointed in their direction. A bike mounted head light might be more visible to these motorists. (I really don't know for sure, since I've never tried a helmet mounted light.)

I also pull way to the left of my lane--or even into the left lane--when I see a car getting ready to come into my lane from a side street (you can usually do this easily at night). Not only does this maneuver make it easier for them to see me, it also gives me a little more distance and time for emergency swerving or braking.