Garmin Varia UT800

A bike light is enforced by law when you're riding in the dark. You'll also be thankful for it when the days get shorter during the fall and winter.

Make sure the bike light is powered in a way that is convenient for you. If you ride at night often, rechargeable batteries could be a better choice. Regular batteries that you need to change when out of power are better if you don't use a bike light often.