I'm on the dark side
And you can't come find him
How when it's light all around you
Yeah, But it's dark all inside him

from Lupe Fiasco (Ft. MDMA) – Beautiful Lasers (2 Ways) Lyrics on Rap Genius

Lupe is referring to his 2 personalities, dark and light. His dark side can’t be found, even with all the light he shines (He’s a LASER or “Beamin'”)

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