I mean the ones you see in common areas of buildings in France, such as corridors in blocks of flats. The switch is a button with a small orange light in the middle, and when you push it the lights come on for about a minute, then cut off automatically.
Just out of curiosity, do they exist in the UK (and if so, what are they called)? Could ones bought in France be installed legally in the UK?
(I imagine many people find them annoying, and I don't have a use for them at the moment; I'm just curious --- so no need to flame me.)