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But that's probably not even right. In my understanding, the Big Bang wasn't actually bright, because the first phase of the universe was a superhot but opaque quantum soup. Even the weak nuclear force took time to become distinct from the electromagnetic force. I don't know if energy packets of a combined electroweak field count as photons exactly.
Regardless, the first light as we know it (in the sense that it could traverse the universe) wasn't until a few hundred ~~million~~ thousand years after the Big Bang, when the whole mess had cooled enough to become transparent. We now call that initial light the Cosmic Microwave Background radiation.
Edit: Misstated the age of the CMB