Alumbraste comes from the verb alumbrar, meaning 'to light up' or 'to illuminate'. It's a beautiful and evocative word that goes beyond simply 'lighting' something.
In the song, Luis Miguel sings, "Mi nublado cielo, lo alumbraste con tu sol, Marcela" (My cloudy sky, you lit it up with your sun, Marcela). He uses this word metaphorically to express how Marcela brought light, warmth, and happiness into his life, transforming his sadness into joy. It's a poetic way to describe her profound positive impact.
This song is a pure, direct, and incredibly romantic declaration of love. Luis Miguel isn't being subtle here; he's putting it all out there for a woman named Marcela. He starts with the huge statement, "Nada en este mundo vale nada si no estás" (Nothing in this world is worth anything if you're not here). For him, she is the sun that lit up his previously cloudy sky, making everything beautiful just by being near him.
He piles on the compliments, even saying he wants to give her roses but worries they would "toman envidia de tu piel" (be envious of your skin). It's a classic, over-the-top romantic line! The song itself is presented as a gift to her: "Hice esta canción de amor por ti, Marcela" (I made this love song for you, Marcela). It all builds to a simple, powerful promise of eternal love and loyalty.