Hello,
   I've only had a moment to skim your code, but you will need photons 
to be able to have the light do anything after it reflects.  I was 
messing with something very similar a while back and wrote something 
about it here that might help.  Basically I needed to end up bumping up 
my photons media parameter (though yours is probably plenty high, just 
enable it) and really increasing the media samples.

Here's the message:
http://news.povray.org/web.47af1f65c0351d35b05f96f70%40news.povray.org
There's some other good suggestions in the rest of the thread as well.

This is the scene file when I finally got it working:
http://news.povray.org/web.47af219494e592ceb05f96f70%40news.povray.org

and the corresponding image:
http://news.povray.org/web.47af23af94e592ceb05f96f70%40news.povray.org

Hope its helpful.

-- 
-The Mildly Infamous Blue Herring

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