John Gill Commentary Psalms 18:28

"For thou wilt light my lamp: Jehovah my God will lighten my darkness." — Psalms 18:28 (ASV)

For you will light my candle
Or lamp ^F4 : in (2 Samuel 22:29) , it is, "You are my lamp, O Lord"; which may either design outward prosperity, and the flourishing condition of David's kingdom; or internal spiritual light, and an increase of it, by giving fresh supplies of the oil of grace, to cause the lamp to burn more clearly; or rather the prosperous estate of Christ's kingdom; and may be the same with the lamp ordained for the Messiah, (Psalms 132:17) ;

the Lord my God will enlighten my darkness ;
or "cause light to shine in my darkness" ^F5 ; that is, bring me out of darkness into light; either out of adversity to prosperity, or from walking in darkness to the enjoyment of the light of his countenance; and is true of Christ, not only of the prosperity of his kingdom and interest, but of him personally; who though, when on the cross, was in darkness of soul, being forsaken by his God; yet, when raised from the dead, he was received up to heaven, and set down at the right hand of God, and was made full of joy with his countenance, (Acts 2:28) .

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FOOTNOTES:

• F4: (yrn) "lucernam meam", Pagninus, Montanus, Junius & Tremellius, Piscator
• F5: So Gussetius, Comment. Ebr. p. 495.