It's a whole lot of light and a whole lot of arm length

from Lupe Fiasco – Lupe Back Lyrics on Rap Genius

Meaning

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.

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