The day is thine, the night also is thine; thou hast prepared the light and the sun (see Genesis 1:5, Genesis 1:15, Genesis 1:16); rather, thou hast prepared him light and sun. "Luminary" ( מָאוֹר) is probably a class name for the heavenly lights generally.
The sun is then particularized, as so much the most important of the luminaries. But the result is "an imperfect parallelism" (Cheyne).