Who commanded the light to shine (ὁ εἰπὼν φῶς λάμψαι)
The correct reading is λάμψει shall shine; so that we should render, it is God that said light shall shine. So Rev.
To give the light of the knowledge (πρὸς φωτισμὸν τῆς γνώσεως).
Lit., for the illumination, as 2Co 4:4. In order that the knowledge may lighten. Knowledge, if not diffused, is not of the nature of light.
In the face of Jesus Christ
Containing the thought of 2Co 3:18. The knowledge of the divine glory becomes clear revelation to men in the face of Christ as it appears in the Gospel: “So that in this seen countenance that clear-shining knowledge has the source of its light, as it were, its focus” (Meyer).