I suspect there is a certain amount of myth here. Lights being dimmed for night take off and landing in passenger aircraft was ostensibly for better night vision. Practically speaking it is and was a waste of time. You need several minutes of total darkness to gain an appreciable benefit. Typically there is a fair percentage of passengers who will have their over head reading light on and believe me that is a very bright light that effects nearby passengers night vision. The pilots of course will have landing lights on plus map lights and of course bright approach and runway lights. So you can effectively scratch their night vision.
The flight attendants will be strolling down the aisles also being effected by reading lights and certainly there will be some lights in the galley. When the cabin lights are dimmed, it effectively makes it difficult for elderly passengers and those wearing glasses, to pin point the emergency exit signs even if they can see over the passengers seat directly in front of them. Of course, if you then decided to look at the safety briefing card in your seat pocket shortly before landing or take off to familiarise yourself with the position of the emergency exits or to read how to open the main doors, you will probably need to turn on the over head reading light - so, scrub night vision again. If the airlines were really serious about night adapation then as well as all ceiling lights, all overhead reading lights should be switched off well before take off and landing. If it is good enough that seat backs should be raised and seat belts secured for every single person on the aircraft, then all overhead reading lights (being the brightest of them all) should also be turned off. I can just imagine any airline insisting on that! Which brings me back to the thought that dimming of ceiling lights is paying lip service to an emergency.
If the aircraft aborts the take off at high speed and that takes anything up to 45 seconds of screeching brakes, reverse thrust and other horrible noises, then I am sure most passengers, especially the elderly and sight impaired (wearing glasses, stupid!) would prefer to be able to see immediately the position of the exit signs. But with the cabin lights romantically dimmed (for your comfort and safety?) these signs are hard to focus on with all the vibration and racket and fear in an abort.
So, if the reason for dimming the cabin lights is for passenger night adaption, then forget it because half the passengers and all the flight attendants and all the flight crew will be out of the picture.
I have been in one airliner where the flight attendants actually turned off all the ceiling lights for take off and landing in the middle of a bright sunny day for night vision adaption...