What are all the lights in this giant shaft for?

Transcript

Nute Gunray: {over PA system} Ruke. Ruuuuke!
Luke: Huh? Obi-Wan?? You'll have to excuse me, I'm concentrating on falling here.
Nute Gunray: Attention: Ruke Starkiller! This is Nute Gunray.
Luke: So... not Obi-Wan, then.
Nute Gunray: Tell me, Ruke, how did the Empire work out for you?
Luke: Um...
Nute Gunray: Join me. For the opportunity of a rifetime.
Luke: Oh no, not again.
Nute Gunray: I'd rike you to be my right hand man.
Luke: That... may be a problem.