When operating a power boat at dark What does it mean when you see only a red and Green light on another boat?

When you see only a red and green light on another boat at night, it indicates that you are likely seeing the side lights of that vessel, which means it is facing you. The red light is on the port (left) side, and the green light is on the starboard (right) side. This configuration suggests that the other boat is either moving towards you or is at anchor, and you should take appropriate actions to avoid a collision. Always maintain a safe distance and be prepared to adjust your course.