Using your bicycle lights during daytime hours is a brilliant strategy for enhancing your safety while riding a bike. There are lots of distractions on the streets from the various modes of transportation (pedestrian, auto, bike, scooter) and from cell phone usage. It is common sense, and legally required, for cyclists to utilize a front light and rear reflector at night, but there are studies that say the majority of cycling crashes occur during daylight. Daytime running lights on autos have made a positive impact on traffic safety so there was a 12 month Danish study to see if safety benefits extend to biking. In the study the use of daytime lights resulted in a 19% reduction in personal injury rates—that is a 1 in 5 drop in the risk of being injured. Being “always on” is a good idea.
You can use the same bicycle lights in the daytime you would at night, but there are some considerations that may impact which light you choose
How to Select a Bike Light for Daytime Use
Sharon Kaminecki and others comment on adventures in bicycling and other stories