When I mentioned "God is light" and you come back with turning a light on and off . . . I said that it wasn't that simple - God IS light. . . . That is one of God's attributes, characteristics - what He IS. It was to prove that there is NO darkness in Him AT ALL and "darkness" would have to be in Him in order to give Satan "permission" to do "darkness". . . . nothing to do with the demons asking permission to go into the pigs, nothing about "outer darkness. I don't see what the demons had to do with being in God's presence; they weren't in the light in the first place to have God turn them away from His presence.
I am sending you to them (Gentiles) to open their eyes and turn them from darkness to light, and from the power of Satan to God (Acts 26:18a) See the correlation: turn them from darkness to light, from the power of Satan (darkness) to God (light)