G5458–φωστήρ–phōstēr

so that you may always prove yourselves to be blameless and spotless--irreproachable children of God in the midst of a crooked and perverse generation, among whom you are seen as heavenly lights in the world,

φωστῆρες phōstēres “lights”

and bringing with it the glory of God. It shone with a radiance like that of a very precious stone--such as a jasper, bright and transparent.

φωστὴρ phōstēr “radiance”