Light blue is a color. It is a shade of blue. Technically, it is not a shade of that color. It is instead a shade of cyan. Sky blue is a color similar to light blue.
The first use of light blue as a color name in English was in 1915.
Crayola light blue[change | change source]
Crayola light blue is the color that is called "light blue" in Crayola crayons. It was only available in 1958.