I have 6 simple light bulbs(120vac) in various places and I can't see them all. If one of the lights is turned on I would like a simple way to indicate to me at my desk, which is away from the lights, that a particular light is on. Is there any simple circuit I can make to detect the bulbs other than running 120v wire from each bulb to a box beside my desk? Even wireless or a ready made detection system would be good.