The True Light

In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things were made through Him, and without Him nothing was made that was made. In Him was life, and the life was the light of men. And the light shines in the darkness, and the darkness did not comprehend it. 
There was a man sent from God, whose name was John. This man came for a witness, to bear witness of the Light, that all through him might believe. He was not that Light, but was sent to bear witness of that Light. That was the true Light which gives light to every man coming into the world.
He was in the world, and the world was made through Him, and the world did not know Him. He came to His own, and His own did not receive Him. But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. - John 1:1-13 

The life in the LORD JESUS is the light of men.
He is the True Light.
When you receive CHRIST JESUS into your heart, you receive life which is light.

For it is the God who commanded light to shine out of darkness, who has shone in our hearts to give the light of the knowledge of the glory of God in the face of Jesus Christ. But we have this treasure in earthen vessels, that the excellence of the power may be of God and not of us. - 2 Corinthians 4:6-7 

This same GOD Who is Light, Who created light by speaking it out saying "Let there be Light" has also now shone in our hearts. We carry this light in our physical bodies like a light bulb!

Do all things without complaining and disputing, that you may become blameless and harmless, children of God without fault in the midst of a crooked and perverse generation, among whom you shine as lights in the world, holding fast the word of life, so that I may rejoice in the day of Christ that I have not run in vain or labored in vain. - Philippians 2:14-16 

Your Light shines forth when you live according to the Word of GOD.

"You are the light of the world. A city that is set on a hill cannot be hidden. "Nor do they light a lamp and put it under a basket, but on a lampstand, and it gives light to all who are in the house. "Let your light so shine before men, that they may see your good works and glorify your Father in heaven. - Matthew 5:14-16 

When the LORD JESUS walked on this earth, He was the Light of the world. Now He wants us to shine His light in this dark world.
When your light is lit by JESUS in your life, You need to let your light shine by doing good works in obedience to the Holy Spirit.
Do not suppress this light by carnality and selfishness but let it shine through selflessness and love.
Our Heavenly Father is glorified through such a life.

Let no one deceive you with empty words, for because of these things the wrath of God comes upon the sons of disobedience. Therefore do not be partakers with them. For you were once darkness, but now you are light in the Lord. Walk as children of light (for the fruit of the Spirit is in all goodness, righteousness, and truth), finding out what is acceptable to the Lord. And have no fellowship with the unfruitful works of darkness, but rather expose them. For it is shameful even to speak of those things which are done by them in secret. - Ephesians 5:6-12 

The fruit of the Spirit manifesting in our lives causes us to shine forth as children of Light.
Just as light exposes things that are in darkness, this Light of GOD exposes the unfruitful works of darkness first in us and then in others.

If you visit a 'Lighting Store', you will see a variety of beautiful bulbs that shine the same electric light in different ways.
GOD has created you as an unique bulb with  an unique character, abilities, talents and skills to shine forth His Light in the surroundings He has placed you. Let your Light shine so that your Heavenly Father may be glorified through you!