What does a properly lit sail boat look like at night?

A properly lit sailboat at night should display a combination of navigational lights: a white stern light at the back, red and green sidelights on the bow to indicate port and starboard, and a white masthead light if it's over 20 meters long. Additionally, any deck lights should be positioned to illuminate the working areas without causing glare for the crew. The overall effect creates a clear visual signal for other vessels, ensuring safety and visibility on the water.