a photo transistor;
http://uk.farnell.com/vishay/tept5600/phototransistor-sensor-ambient/dp/1497673
a red led
http://uk.farnell.com/cml-innovative-technologies/cmd5055/led-5mm-red/dp/1139562
some circuit diagrams;
http://home.cogeco.ca/~rpaisley4/PhotoDetectors.html
When the male XLR shell housing the photo transistor is mounted over a cue light, and the cue light comes on, then the LED comes on.
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