Details Navigation Lights
According to the Coast Guard -- A vessel under oars (paddles) may
exhibit the same lights as a sailing vessel, but if she does not, she shall
have at hand an electric torch (flashlight) or lighted lantern which shall be
exhibited in sufficient time to prevent a collision. This rule also
applies to sailing vessels less than 7 meters (22.97 feet) in length.
You must have at least one handheld flashlight close at hand while
paddling at night. I also suggest reflective tape at several points on
your hull, and a white light strapped to the back of your PFD or the back deck
of your kayak.
DO NOT use a strobelight for normal night paddling.