Quoted By:
>Light-type was going to be a counterpart to Dark-type. Simple as.
>It was always a little strange to introduce Dark by itself.
>The Dark type (Japanese: あくタイプ Evil type) is one of the eighteen types.
Dark as in mean, evil, dirty, shady, nor literal lack of light, dumbass. If anything, your """"Light""" type was introduced in Gen 6 as fairy, which is literal light either.