The plugin was released by @Greg Unrein (Jivesoftware) in Presence Light with a reference to the $588 billion blog post.
It only works on Windows.
Instructions for installing the light and Sparkplug are:
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Exit Spark
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Download the Windows driver for the light
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Extract the driver’'s zip file
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Connect the light to a USB port
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Point the hardware installation wizard at the extracted driver files
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Install the Sparkplug into the Spark/plugins/ directory (attached as presencelight.jar)
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Start Spark
presencelight.jar (689563 Bytes)