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You are missing two important requirements, low cost and low installation impact.
I am still not convinced my idea won't work. Some moderate googling has revealed that not only have others done this, but there is actually a patent for this exact method of room identification;
and some the high-er end Roombas can tell what rooms they are in by using infrared "lighthouses".
I already assume i will be pointing my 'remote' at a light to turn it off/on, like you point your tv remote at your TV. And i will code it to keep it's room identification remembered until it reads another room, meaning i will only need to point it at the light once until i change rooms.