Revelation 21:23 The city had no need of the sun or of the moon to shine in it, for the glory of God illuminated it. The Lamb is its light.
Your entire life exists in the visible spectrum of white light provided by the sun and moon.
It is a very narrow band between infrared and ultraviolet.
Humans have a very limited ability to see but the intelligence to create ways to “see” further.
However, the holy city does not need an external light source.
It’s like it was in the beginning!
On the first day light was created but the sun wasn’t created until the fourth day.
Add to that the words of the Apostle John, “In Him was life, and the life was the light of men. 5 And the light shines in the darkness, and the darkness did not comprehend it.” John 1:4-5
I do not fully understand it but understanding is not necessary for acceptance.
Spiritually speaking, sin blinds us to many things and darkens our present and future.
Sin is a darkness to faith.
Without sin believers will live in a new light, allowing us to see everything differently.