On a nice sunny day I don't use lights. On overcast or foggy days I use a flashing tail light and flashing headlight. At night I go with two taillights, one flashing and one steady and the headlight is on steady. No flashing headlights at night for me. What I can't stand is someone at night on the bike path running a flashing front light. What purpose does it serve? It doesn't do them or anyone else any good. The last time I saw this I thought about turning my lights on flashing to see how he likes it. I doubt he would like 3,000 lumens flashing in his eyes and might get the point across.