text: three lights, one room, and you? there are 3 lights in the room, and 3 switches outside the room, you can not stand in the room and reach the light switches, nor can you leave the door open to watch the lights. you are only allowed to enter the room once, and you need to find out which switch is for which light, they are not labelled, and all switches and lights are the same, you are alone. there is a simple answer, 10 points for the first to get it. turn light switch 1 on and leave it there for 10 minutes. then turn it off and turn switch 2 on. go into the room. the light that is on is switch 2, the light that is off and warm is switch 1, and the light that's cold and off is switch 3.