Evacuation precaustions
It may be conforting for some to decide that anyone taking an action he/she doesn't understand must be stupid but it could be he/she doesn't understand
Dimming to preserve night vision is far from ridiculous. Night vision repair takes a finite time and the brighter the previously light the longer night adaption takes
Best results are if the cabin lights prior to the event are of the same brilliance as the inner outer emergency lights