Help me out, Padre. Just when was there Light?

*snicker*

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Gen 1:5 And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.

Gen 1:14 And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years:
Gen 1:15 And let them be for lights in the firmament of the heaven to give light upon the earth: and it was so.
Gen 1:16 And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also.
Gen 1:17 And God set them in the firmament of the heaven to give light upon the earth,
Gen 1:18 And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good.
Gen 1:19 And the evening and the morning were the fourth day.