light bulb

There is a window-less closed room with one light inside. Outside the room there are 3 light switches. Which one operates the light inside?

You are allowed to enter the room once, and only once, after which you must leave the room and close the light-proof door. Play with the switches as much as you like before you open the door to go in.

Originally posted by camilli
There is a window-less closed room with one light inside. Outside the room there are 3 light switches. Which one operates the light inside?

You are allowed to enter the room once, and only once, after which you must leave the room and close the light-proof door. Play with the switches as much as you like before you open the door to go in.

You only have to distinguish between hot, cold, and bright...

This has been posted multiple times here.