en_tn_condensed/isa/49/06.md

I will make you a light to the Gentiles

The servant bringing Yahweh's message to the Gentiles and helping them to understand it is spoken of as if Yahweh made the servant a light that shines among the Gentiles.

to the ends of the earth

"to all the farthest places of the earth" or "to the entire earth"