Originally Posted by
Reynolds
In theory lights should make you more visible, but in practice I doubt they are really noticeable by day, especially in bright sunlight (common bike lights, not high power strobes).
Ive had many drivers during the day, when I stop comment how noticable my lights are. There are to many variables on the
road /parking lots to not use both rear & front lights during the day. It can & has for me made a difference.