I use Bontrager flashers front and rear, Hi-Viz shirt or vest. Observing other riders similarly equipped, such lights are visible for half a mile in daylight. I understand neither lights nor bright clothes are a guarantee. I'm willing to use the scarce energy resources necessary to charge the lights every few rides if they give me even a slight safety edge on the road. Cost of the lights is insignificant compared to the price of my bike and the value of my life.