I am not an officer of the law, but I would guess that having no lights on at night would be illegal. The typical rear light on a boat should be on as an "anchor" light. While the boat is moving or running, both the rear "anchor" light and the front "navigation" red/green lights have to be on. I've seen water ski boats running during predawn (still dark) hours without lights and pulling water skiers on Saguaro and Canyon. My navigation lights will cast a soft glow on a nearby shoreline at night. I also have used 4 watt 12 volt incandescent bulbs that are in round aluminum covers (Home Depot) with heavy duty clamps on them that I have used at night. I also have Stan Sloan blacklight/flourescent lights I have not used yet because I am not yet using flourescent line. Fishermen will turn off their night lights at night because they think the light will scare away the big fish. I know the light does not scare away the baitfish.