God from god light from light meaning?

Answer 1

If I understand your question correctly, God is the light of this world as is His Son Jesus Christ. From them comes all knowledge (Light) Precept upon precept, here a little there a little until we all come to an understanding of God and become partakers of his light.

Alternatively, if you are referring to the phrase below from the Nicene creed

And in one Lord Jesus Christ, the Son of God, begotten of the Father [the only-begotten; that is, of the essence of the Father, God of God], Light of Light, very God of very God, begotten, not made, being of one substance with the Father;

This is a statement of the divinity of Jesus, being of the same essence as God. It denies that Jesus was in any way made or created, even if that "creating" was done by God. Jesus proceeds from or streams forth from the Father, and has always existed.