When God began creation of this world it was formless, dark and empty. Though His Spirit hovered above it yet His Personal Presence was not in it. We know this because
“God is pure light. You will never find even a trace of darkness in him.” (1 John 1:5b TPT)
But God did not want to stand aloof from His creation. He wanted to be part of it. He wanted to enjoy it, make it good like Him for “His life is light for all humanity.” (John 1:4b TPT). So He spoke His own Presence into His creation, “Let there be light,” and there was light.
That means every experience I have of light is an experience of the life giving Presence of God.