Disparo de luz literally translates to "shot of light." While disparo often means "shot" in the context of a gun, here it's used poetically to describe a sudden, intense burst of light.
In the song, Alex Cuba uses this phrase to describe the captivating effect of a smile: "Hay un disparo de luz en tu sonrisa" (There's a shot of light in your smile). It evokes an image of a radiant, almost explosive, brightness that immediately grabs attention and signifies a powerful, positive impact.
Alex Cuba's "Para Dos" is a beautiful song about the profound impact of a truly special connection. It's about a love and friendship that feels like a "disparo de luz en tu sonrisa" [a shot of light in your smile], something that takes over you like a gentle breeze, bringing a sense of movement without fear or suffering. This isn't just any feeling; it's an honest love that teaches honor without needing to own it.
He sings about how this person's "amor y tu amistad Me significan más Que todo cuanto pueda existir" [love and your friendship mean more to me than all that could exist]. It's a realization of what it means "De amar sin condición De sentimientos libres para dos" [to love unconditionally, with free feelings for two]. This person has helped him grow, making him the man he is now, all without him even realizing it. It's a sweet and heartfelt tribute to a relationship that brings out the best in you.