hi there,
as we know css uses colors when we write: lightblue or lightgreen.
Can not find something that hits your question.
Here is a link to a whole bunch of lightcolors:
“<named-color> - CSS: Cascading Style Sheets | MDN”
i guess it is not easy for the machine to just use a prefix as" light "to make the colour brighter, for every colour is different in the way it appears to us. So the machine must use fixed values for each of this named colours. And this may be the reason every " light "-colour has a own name instead.
Happy Coding