Bhagavad Gita, Chapter 15, Verse 6

That the sun illumines not, nor the moon, nor fire; that is My Supreme Abode, going whither they return not.

Even light itself, in every familiar form, is named here as unable to reach this particular place.

Krishna doesn't need the sun or moon or fire to describe this abode's brightness, he names it as beyond needing them at all. Real self-sufficiency is what sets this place apart.