John 8:12 - Then Jesus spoke to them again, saying, “I am the light of the world. He who follows Me shall not walk in darkness, but have the light of life.

Jesus is not the light of the physical world.  The earth was without form and void and God said "Let there be light."  The sun and the moon are the light of the physical world.

Jesus is the light of the spiritual world.  When Jesus lives inside of us, we become the light of the world.  We are his embassadors here on earth to provide light to a darkened world.

Light draws people.  Being filled with God's light will bring others to the Light of the World, Jesus.

Walk in Light
8 For you were once darkness, but now you are light in the Lord. Walk as children of light 9 (for the fruit of the Spirit[b]is in all goodness, righteousness, and truth), 10 finding out what is acceptable to the Lord. 11 And have no fellowship with the unfruitful works of darkness, but rather expose them. 12 For it is shameful even to speak of those things which are done by them in secret. 13 But all things that are exposed are made manifest by the light, for whatever makes manifest is light. 14 Therefore He says:


      “ Awake, you who sleep,
      Arise from the dead,
      And Christ will give you light.”