What color light would you expect on a spherical buoy?

The light color you would expect on a spherical buoy is typically white. Spherical buoys are used primarily to indicate safe water and are often unlighted unless they are marked with a light.

If a spherical buoy does have a light, it is most commonly white, which is used universally to signify safe waters, meaning vessels can navigate around without significant hazards. In contrast, red and green lights are used on lateral markers to indicate navigational sides—red on the port side and green on the starboard side. Yellow is mainly used for special marks that denote isolated dangers or cautionary areas but not on spherical buoys.

Thus, the expected light color for a spherical buoy is white, as it conveys the message of safe passage.