Please supply the scientific theory of how God created light when he said "let there be light". Please include the testable elements of the process by which light was created.
include evidence supporting this theory.
This type of request is an oxymoron.
Think if a Creationist asked you the come up with a Theological Theory to explain how Scientific Laws created light.
What is sensible would be to ask Bible experts to state a correspondence between what Science says and what the Bible says in regard to Gen 1:3-5.
A Cosmic Dark Age DID precede that advent of that Act-of-God when "let there be light" began to flood the cosmos after the darkness following the Big Bang.
Gen. 1:3 And God, (next, after the creation of the Heavens), said, Let there be light (: and there was light, (which had been delayed by 400 million years after the Big Bang by a Cosmic Dark Age throughout all the universe).
Gen. 1:4 And (Father Nature, the Force behind the ever unfolding Reality), God, saw the light, that it was good: and (Father Nature, the Force behind the ever unfolding Reality), God, divided the light from the darkness (as the stars formed).
Gen. 1:5 And (Father Nature, the Force behind the ever unfolding Reality), God, called the light Day, and the darkness he called Night.
here one can see that the end of the Dark Cosmic Age agrees with what Genesis says, but why this darkness existed and why it ended is in the domain of science to explain. It is enough for the Bible to show the writers KNEW about it 3362 years before we did.