triadic
Normal eyesight takes only seconds to adjust in such a situation - having the lights bright or dim does not change that.
For the record full night vision takes 20 - 30 minutes to acquire not a the few seconds that you claim. Do a search on the internet or better still have a look at some Human Performance notes from any ATPL course. Cabin lights are dimmed for safety reasons. Nothing more nothing less. They're not dimmed so the punters can have a pretty view of the light from their window as some may think.