A visitor for the US asks the following question: "Who is the father of light?"

"Father of Lights" (note that I'm using the plural of "light") is a phrase which is found in the Bible, and is used to describe God. The reference, in case you want to know, is James 1:17, which reads as follows (using the King James translation):

Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning.

Reading this in a modern translation (New International Version):

Every good and perfect gift is from above, coming down from the Father of the heavenly lights, who does not change like shifting shadows.

What does the phrase mean? Well, that's a good question! And there are a few ways to take meaning from the title.

1. It is a reference to creation; God as the creator of all the heavenly lights, is referred to as the father of them. In a sense, then, you could give Him the title "Star Father."
2. It is a reference to Jesus, who called himself "the light of the world." Following the logic of that; if Jesus is the light, and God is his father, then God is the "Father of Light."
3. Light, in the Bible, is usually associated with either knowledge or righteousness (or both). For example, Isaiah 9:2 says that "the people who walked in darkness have seen a great light," and according to one Bible dictionary, the word "darkness" there metaphorically means one of the following: misery, destruction, death, ignorance, sorrow, or wickedness. Thus, of course, light would be, metaphorically, the opposite. So saying "Father of Light" could be the equivalent of "Father of Knowledge" or "Father of Righteousness."

The conclusion of the verse, which says he is unchanging, and has no shifting shadows, may be a reference to the stars, which twinkle and shift - indicating that God is greater than the stars of the heavens.

Thanks for asking, and I hope that was helpful!

Professor Puzzler