Why would he have to create a temp light-emitting object? Why not make the sun on the first day? Why does he need light anyway? To see? See what? These questions are moot when the creation story is seen as the analogy it is. If not, those questions can't be answered with understanding or authority. Authority and understanding are one and the same. I gave a short answer to what the 'Light' was/is. You reject it out of hand without understanding the point. So let's just move on.