'Light' in the Bible

Alas, those who desire the day of Yahweh, why [is] this for you the day of Yahweh? It [will be] darkness and not light!

[Is] not the day of Yahweh darkness and not light, and pitch dark with no brightness in it?

And then in that day," {declares} my Lord Yahweh, "I will make the sun go down at noon and I will darken the land on a day of light.