You are the light of the world. Matt 5:14
Jesus called himself the light of the world. (John 8:12). The word used for world here is cosmos. Cosmos does not depict the physical world – only – but the order of the universe.
Jesus is not a physical source of light such as a lamp in this world, at least not in this time. We see in Revelation that there will be no sun nor moon as God is their light. The spiritual light broke through into our dimensions.