I ride with three lights. One white in front, flashes during the day (I seldom ride at night, as my 'night vision' isn't what it used to be.) Two in the rear, one under my saddle, one on the back of my helmet, both flashing during the day. I think if I had to ride after dark, the front light would be on steady for obvious reasons, and I would have one rear light on steady, and the other flashing.