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1.
A smart young person. Common terminology in New Zealand and Australia. Also in use in Britain, though less common.
Did you see how Jimmy has hooked his TV up to the toaster so that it automatically prepares him toast for the ad breaks?

Yeah, he's a real bright spark.
by scurvyknave November 13, 2008
 
2.
referring to a complete idiot in a sarcastic way. Comes from Caboolture,a suburb in Brisbane Australia,famed for its many Bright Sparks.
"Oh,she knows how to make coffee,wow,,she's a real bright spark!"
by Andrew Terry January 26, 2005