NET

6 For God, who said “Let light shine out of darkness,” is the one who shined in our hearts to give us the light of the glorious knowledge of God in the face of Christ.

Darby

6 Because [it is] the God^D8411 who spoke that out of darkness light should shine^D8412 who has shone in our hearts for the shining forth^D8413 of the knowledge of the glory of God in [the] face of [Jesus] Christ.

Darby Bible Notes

God - Or '[it is] God.' shine - Lit. 'who spoke light to shine out of darkness.' forth - 'Shining forth,' or 'radiancy;' the same word as translated 'radiancy' in ver. 4.

KJV

6 For God, who commanded the light to shine out of darkness, hath shined in our hearts, to [give] the light of the knowledge of the glory of God in the face of Jesus Christ.