Little Bit of Logic

     You are in a room with three light switches.  In the next room, there are three lamps.  There is a closed door between the two rooms that you cannot open.  You need to figure out which switch turns on which lamp.  The switches are all in the off position, and there are no windows. In thirty minutes, I'll bring you from the first room to the second room, and you'll have to tell me which switch turns on which lamp.  How will you solve this brainteaser?  Leave me a comment if you think you know the answer.  No cheating because you'll lose the satisfaction of figuring it out yourself.  Stay tuned for the answer.  Good luck!