Basically if an item is not listed in the MEL then it is required for flight.
If it is listed then any allowances will be shown.
There is a lot of information in the introduction of an MEL that many people fail to read.
In this case common sense would require external emergency lights at night but not in daylight. I expect the internal ones are required at all times as the cabin could be darkened by closed blinds.
Just a thought though. What if a solar eclipse is going to happen during your flight.