'Light' in the Bible

And he said to me, What do you see? And I said, I see a light-support, made all of gold, with its cup on the top of it and seven lights on it; and there are seven pipes to every one of the lights which are on the top of it;

And I made answer and said to him, What are these two olive-trees on the right side of the light-support and on the left?

And it will be unbroken day, such as the Lord has knowledge of, without change of day and night, and even at nightfall it will be light.