無邪気な光 is OK (I guess. I'm not a native speaker, but the syntax and the meaning is correct)
あどけない光 would be the proper syntax, but somehow the meaning feels strange - as if the adjective is not quite right.
Both of these would translate into "innocent light" in English.
"Light innocent" doesn't really work in English unless its some specialized context, therefore its hard to imagine would this construction would look like in Japanese.