Came across this thread on cgtalk.  Simple idea of painting lights on a 
black spherical map and boosting the intensity.  There is a site that 
supplies professional HDRI versions of these and displays sample thumbnails 
of what the spherical maps look like.  This simple technique works with 
Povray, even with just the sample thumbnails!  There is an example mental 
ray render and an animation linked from this thread.

http://www.cgtalk.com/showthread.php?t=210291

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