Getting light means that the Holy Spirit gives you revelation about something. For example, when you have “enlightened eyes” you can get light over your own sin and see that you are selfish, proud, etc. It can also refer to getting more insight (revelation) in the Word of God and His work in and promises for those who follow Him. (Psalm 118: 27; Psalm 119:130; John 1:4-5; John 3:19-21; 2 Corinthians 4:6; Ephesians 1:17-18)