Kayaks fall under the “vessels under oars” classification according to the U.S. Coast Guard. This means they are required to “have ready at hand an electric torch or lighted lantern showing a white light which shall be exhibited in sufficient time to prevent collision”. These are just the minimum requirements. The more lighting options you have on your kayak the safer you’ll be. Also be sure to check your local state laws and regulations, as they vary from state to state.