This has nothing to do with Genesis.
Genesis 1:2-4, "Now the earth was without shape and empty, and darkness was over the surface of the watery deep, but the Spirit of God was moving over the surface of the water. God said, “Let there be light.” And there was light! God saw] that the light was good, so God separated the light from the darkness."
Now, following your (mis)interpretation...
John said that Jesus was the actual creator. John 1:3, "All things were created by him [Jesus], and apart from him not one thing was created that has been created. " Therefore, if Jesus is the light of the world in the context of Genesis, He was full of darkness(!) and then created Himself as light.
Secondly, if He was the light of men, there were no men created yet.
Thirdly, the only verse I could find even remotely stating that He lights heaven is Zechariah 14:6, "On that day there will be no light—the sources of light in the heavens will congeal" which, in your context, is absurd. Jesus will not extinguish Himself.
Jesus is the Eternal Word, John 1:1 In the beginning was the Word, and the Word was with God and the Word was God.
Our creation was formless and void and in darkness, then when God spoke the Word "let there be light", then Jesus is revealed to the creation and light is now made manifest and the division between light and dark now exists. That command is still happening today.
Secondly, if He was the light of men, there were no men created yet.
Before the creation began, it was already planned to send Jesus to redeem us from sin, to send the light into the world to rescue us from darkness.
He indeed was foreordained before the foundation of the world, but was manifest in these last times for you. 1Pet 1:20
Notice we now have light in our creation, yet the sun and the moon and the stars were not created until the fourth day.
Jesus is the true light and when He walked in His pre incarnate form past Moses who was in the cleft of the rock Moses would have died from His brilliant glory if he saw His face, as it was, God placed His hand over the cleft in the rock, yet Moses face still shone from talking to God so that he had to veil his face in front of the Israelites.
And then in our eternal Home in heaven, there be no need for a sun as the light of God will be enough, we will be in the cleft of the rock(Jesus) and covered by His hand(the cross work) so we can be in His presence. What a terrible thought that those who are not covered by His blood will come before Jesus face to face to bow the knee, their presence will literally melt away like a man in a spacesuit floating towards the sun.
They will be sent to darkness which is the absence of light, as there will be no way for them to tolerate the light.
Anyway Jesus veiled His glory when he clothed Himself in His human vessel yet He was still the light come into the world and will again put on His glory.
"And now, O Father glorify Me together with Yourself, with the glory which I had with You before the world was. John 17:5