Hi there.
ICEPACK,as far as i'm aware,pretty much all the airlines have dimming or turning off the cabin lights in the approach and landing phase as standard.Its an aeromedical safety requirement based on the principle that one's eyes need time in the dark to adjust and if one was suddenly to find onesself outside the cabin after an accident at night one would already be visually adjusted.
In a landing where there are definite safety concerns like this one,i would have thought cabin lights off would certainly be a priority.an evacuation would not have been a pretty sight with 350 temporarily night blind pax.