On the road to Damascus, Saul was blinded by a bright light, and henceforth saw things differently. He stopped persecuting Christians, changed his name to Paul and founded a new religion based on the life of Jesus. Just a little after George Fox lived, we began to describe the 17th century as The Enlightenment. It was a time when reason began to win out over church doctrine, a time when science came to the fore. We often use light as a metaphor for knowledge.
Angels always have a circle of light, a halo around their faces, and sometimes their whole selves.
Some humans, those who are able to see auras, say we do too. Science has now begun to back them up - making the Human Energy Field visible with sophisticated equipment. At the end of life, people often see light, or have a sense of being taken up into a light. This is true in the East as well as the West. The Tibetan Book of the Dead tells us that the first thing a dying person is aware of is a clear light.