I did say what it was, a couple of times. I will summarize - when we receive the light we get the truth, which means that God becomes real to us, and we know who Christ is (). Darkness is to falsehood (which includes sin, but darkness is not just about sin), as light is to truth. To summarize how the love, light and life of God fit together, as Scripture reveals - the Holy Spirit gives us life, this life issues in love and light. The love issues in grace, and the light issues in truth. says grace and truth came by Jesus Christ, because He brought us God's life, love and light. Jesus is the true light of the world (), and also God's love to us (), and Jesus is also the life ().
On the negative side, of man's fallen condition, the fall of man brought death, this death issued in hatred and darkness. The hatred brought judgement and works and anything else opposite grace, and the darkness brought sin. God's solution to sin and darkness is light. God's solution to judgement and works is grace. God's solution to hatred is love. God's solution to death, is life. Christ is our light, grace, love, and life. God's solution is found in Christ.