God made us adaptive.
We get into things that aren't good, even if we don't partake ourselves, and we start looking "dark". Not in complexion, but in nature. We just look like what we surround ourselves with.
That's why, when Moses came down from the mountain with the tablets, his face was shining. He had been close enough to God that he had become sort of like him; God's glory was embedded in him, and he radiated. He didn't know it was happening, but eventually put on a veil to cover it. He had been in the presence of God, seen God pass by (not His face), and it caused him to glow (Exodus 34).
That's not the only instance of this happening, either. In Luke's account of the Transfiguration, there's one noticeable variation from the other two accounts. There are other accounts where Jesus' face was shining (Matthew's version compared Jesus' face to the sun), and His clothes were bright as lightning, but this account says Moses and Elijah were in "glorious splendor." (Matthew 17, Mark 9, Luke 9)
Quite possibly shining along with Jesus.
The angels at the tomb of Jesus are described as wearing clothes that were like lightning.
1 John 3 says that what we will be has not yet appeared, but we know that when He appears, we will be like Him.
God made us adaptive. When we are in the presence of God, our nature alters to be more like His--even to the point of literally glowing. Personally, i've never glowed, nor seen someone who did. I do know, however, that when He comes in His full glory, in comparison to His prior earthly existence as a butterfly is to a caterpillar, we will also be transfigured. We will radiate. We will shine like Him.
Lastly, and not least, there is Revelation 22. The final chapter of the final book of the Bible.
When God has wiped every tear from our eyes, when He has given the water of life to the thirsty, when He dwells among us, He will replace the sun.
"There will be no more night. They will not need the light of a lamp or the light of the sun, for the Lord God will give them light." (22:5)
And we're going to get to be near Him, and we will become more like Him, because He made us to be like what we surround ourselves with.