This is the 1432nd most frequent Japanese word.
東光
"東光" translates to "eastern light" or "light from the east" in English.
In this sentence, '東光' refers to a proper noun, specifically the name of a town.
私は東光の街が好きです。
I like the town called Tōkō.
Here, '東光' again indicates a proper noun, referencing a place that is being developed.
東光の開発により地域が発展しました。
The development of Tōkō has led to regional progress.
In this instance, '東光' could signify a mythical entity or concept within the context of a narrative.