Different kinda Bible you got there.
I always read that God's first act was "Let there be light."
You should read the Bible again. First line of the whole book is “in the beginning God created the heavens and the Earth.” Light came after.
“I always read that God’s first act was “Let there be light.””
Nope, check it again:
“1 In the beginning God created the heaven and the earth.
2 And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters.
3 And God said, Let there be light: and there was light.”