Originally Posted by Visceral
TDKR also has a theme of the truth having its day. Light, thematically, has always been a symbol of the truth. So at the beginning Batman literally has a gadget that sucks the light out of a room. That he is so far consumed by the monster he has created that he only lives in the dark recesses of his mansion. Bane makes mention of his experience with light as nothing but blinding.
Wow man, never even thought of that one. Nice observation
Dark and light are very strong themes in any Batman story, but especially TDKR. It's pretty overt in instances like the pit, where we're constantly looking up at a big circle of pure white light, but that example you just gave is way more subtle.