What is the criterion for light ice pellets?

Light ice pellets are characterized by being small in size and typically scattered, which means they do not cover surfaces completely. The definition of light ice pellets specifically mentions that they might be present intermittently and do not result in a uniform coating across surfaces like a heavier precipitation might. This scattered nature indicates that while they may be falling, their impact on the overall condition is less significant than more concentrated forms of precipitation.

On the other hand, complete coverage of surfaces, affecting visibility, or pellets being heavier than a specific diameter would relate to heavier forms of precipitation that do not qualify as "light" ice pellets. Therefore, the criterion of being scattered while not covering surfaces aligns best with the definition and expectations associated with light ice pellets.