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You can get switches for this purpose which might be simpler, designed to turn off when the door is closed: https://www.toolstation.com/white-flat-plate-mortice-door-switch/p52171
Then just wire in any light fitting that suits the space.
Arducius
@gillies
can anyone recommend a motion activated, mains wired light? It's for an internal coat cupboard - so I want the light to come on when the doors open.