Here the word "light" refers to the ability to understand. Just as God created light, he also creates understanding for believers. Alternate translation: "He has shone ... to enable us to understand the glory of God" (See: [[rc://en/ta/man/translate/figs-metaphor]])
"the glory of God in the face of Jesus Christ." Just as God's glory shone upon Moses's face ([2 Corinthians 3:7](../03/07.md)), it also shines upon Jesus's face. This means that when Paul preaches the gospel, people are able to see and understand the message about God's glory. (See: [[rc://en/ta/man/translate/figs-metaphor]])