Originally Posted by Old Gammy Leg

I recently started using only a LED light on the front, with two flashing LEDs on the rear (one on my bike, on on my backpack). The front LED is a Cateye HL-EL400, a flashing 3 LED model that seems pretty bright. This has coincided with getting a road bike and so acieving much greater speeds than on my MTB. Somehow I feel more vulnerable and less visible than on my MTB, when I used a basic halogen light.

Which type of front light is most visible to cars - LED or halogen? I ride mainly under streetlights. What else could I do to improve my visibility?