Hello
You can opt for a common emergency light type Led, which is hooked with a pair of screws and recharged with a tab to a power outlet (or plugged directly into an electrical distribution box); or put a luminaire that has built-in emergency light on the same ceiling. Both options are valid for the use you want; the difference is aesthetics, but of course the combined teams are more expensive.
There are many models of each type.
I leave photos as examples (not a brand recommendation)