It's a whole lot of light and a whole lot of arm length
This plays off of the previous lines:
whole lot of light — referring to the bomb line means his music has a big effect.
whole lot of arm length- refers to “how far do the arms get”, means a lot of distance.
The light might also be a reference to enlightening people (with knowledge, insight, sick lyrics). In other words, he’s presenting “a whole lot” of knowledge to the world/universe (“stars to the starfish”)
This is all an extended metaphor from the first line where the torches represent good and shedding light on corruption and what follows is a dope way to describe that he will bring all of this good across the world.
To help improve the meaning of these lyrics, visit “Lupe Back” by Lupe Fiasco Lyrics and leave a comment on the lyrics box