The metaphor of light is used throughout scripture.
In this advent season, we learn that Jesus is Light, but in Matthew 5, Jesus says to his people: you are light. Is this a different light? No. We are conduits of the same light.
Where should this light go? In the darkest places. These were the places Jesus was drawn to. He ate and drank with the “outsiders”. So, what is the challenge to us, if we are to be light?