Monroville said:

Remember that this is still on the inside... most skyscrapers are out in the open air, so ambient light is going to have a much bigger effect... not to mention that this tunnel would be full of gas vapors from the various gas mining facilities and carbonite waste production.

You know, wouldn't it be kinda sad that Luke dies not from Vader or the Emperor or whatnot, but lung cancer from the pollution he was breathing in during this sequence?

Right now in a dimly-lit study, someone in a flannel shirt just had a great idea for the next Star Wars trilogy.