G5457 is the noun light. Its seventy-two governed forms include ordinary firelight and lamps, daylight and brilliant radiance, disclosure of what was hidden, ethical and communal identity, witness, revelation, Christ's identity, statements about God, and the illumination of the new Jerusalem. Physical and figurative uses interact, but no single light image carries the entire theology of the corpus.
First John says God is light and denies darkness in him; this is a strong theological predication, yet the noun alone does not settle philosophical categories or make every property of physical light an attribute of God. Jesus is called the light of the world, and disciples are called the light of the world within different passages and roles. Walking in the light includes truthful fellowship and confession, not public exposure of every private detail or forced disclosure to unsafe leaders.
Light and darkness imagery must never be mapped onto skin color, ethnicity, disability, blindness, mental illness, intelligence, wealth, or social status. Texts about sight and light should not shame blind or low-vision people, promise a cure, or treat accessibility needs as spiritual deficiency. Teachers should distinguish physical, revelatory, ethical, christological, communal, and eschatological claims before applying the image.