Prendida literally means "on" or "lit," often referring to a light or a fire. It's a common word, but its use in the song's title, "Luz Prendida" (Light On), is quite evocative.
In the context of the song, it hints at a deeper meaning. The girl sleeps with the light on, suggesting a vulnerability or a need for comfort, perhaps to ward off loneliness or bad dreams. This simple word opens up a window into her character, making it intriguing.
"Luz Prendida" ("Light On") is Kurt's account of falling for someone whose small, specific habits become the whole draw. She "duerme con la luz prendida" [sleeps with the light on] and puts on Friends "pa' olvidar el dolor" [to forget the pain], and he notices that she's "diferente a sus amigas" [different from her friends] while still believing in love despite everything. Her car is a wreck and she's embarrassed to let him ride in it, but none of that matters: "aunque fuéramos en bicicleta, yo la seguiría hasta Nueva York" [even if we went by bike, I'd follow her to New York].
The chorus turns those details into a thesis: "tú eres la prueba verdadera que el amor no es una sala de espera" [you're the real proof that love isn't a waiting room] and "el amor tarda, pero siempre llega" [love takes its time, but it always arrives]. The second verse keeps the same close-up focus, catching her dancing in the kitchen and rewriting his lyrics without noticing she's also rewriting his mood: "sin saberlo les borra el dolor" [without knowing it, she erases the pain]. It's a love song built from small evidence rather than grand declarations, which is what makes the declarations land.