I have a battery operated "push light" from Homebase in my understairs cupboard (a button shaped thing that you push to switch on/off). Trouble is, my wife or minxy daugher will leave the light on and I can say goodbye to 3 AAs.
Is there such a thing as a little time delayed switching component that I could get from somewhere like Maplins and solder in so that the light will switch off after a couple of minutes?
The only other solution is to beat wife/child each time until they learn. Of course I never leave the light on myself!