Sforno on Genesis 1:3/ספורנו על בראשית א׳:ג׳

1"Let there be light" - this is the light of the seven days [i.e., Or HaGanuz], which was for the use of those created without seed, and it will be [again] in the future, as the words of the Sages (may their memories be a blessing) Shabbat 30b: it will then be for that which is the future will "bring forth baked treats and fine clothing" without [needing] the power of seed.