You are operating a powerboat at night what does it mean when you see only red and green light on another power boat?

When you see only a red and green light on another powerboat at night, it indicates that the other vessel is facing you head-on or nearly so. The red light is on the port side (left) and the green light is on the starboard side (right), which means you should give way to that vessel to avoid a collision. It's important to maintain a safe course and speed while assessing the situation.