Motion Sensor transmitter

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I have a slew of old motion sensor activated spot lamps, is there a way
of using these sensors along with a transmitter that would sound a chime
in ones bedroom. X-10 make a chime and transceiver and motion sensor
lite with the transmitter built in, but there are a literally tons of
motion sensor lamps worldwide that have no transmitting qualities. If a
person could make a transmitter that transmits when the lights go on to
a receiver-chime setup in the bedroom.............the transmitter could
be screwed between the bulb and socket. Any ideas where I can get a
schematic for something like this??
Thanx in advance.
Bob