What you should need and what's best are two different things. Some motorcyclists have taken to running pulsing headlights to increase conspicuity and help prevent vehicles from pulling out or turning in front of them despite running high-beams during the day. It happens all the time; perfect visibility, you're there on your motorcycle plain as day with your highbeam blaring, and they still don't see you. Physically, the light travels through their eyes and forms an image on their retinas which send the info to the brain, but it doesn't register in their consciousness. Flashing/pulsing helps wake them up.