Blinking lights make it harder for other bikers/motorists to judge the distance between them and you. So unless you have neon yellow reflective clothing, i would strongly suggest you either use a second steady light or you look for a light with a pulsing function. But this is an issue of your own safety. 500 lm for blinking is overkill, especially at night. It might be useful during daylight, but if a motorist doesn't see you then, he is probably distracted and doesn't pay attention anyway.