However - language about God is analogical: not straightforwardly descriptive. What we know as light is like what God is, in some way; but it’s not the same what God is. No language can be. If God *were *light just as we understand it, He would be matter, not Spirit.
Scripture contains many statements about God that are not true as they stand: He is not a rock, even though He is called one. He could not be, because He is also called king, shepherd, fire, shade, light, lion, warrior etc., - so trying to carry out a geological analysis of this Rock would be ridiculous

He is called these, not because He is reducible to them, but because He is so much more than they. He is Ineffable - not able to be spoken of as He is.