Hey Vilters

http://en.wikipedia.org/wiki/Image-based_lighting

http://http.developer.nvidia.com/GPUGems/gpugems_ch19.html

http://renderman.pixar.com/view/image-based-lighting

 

Google shows plenty on IBL. now, read up and get the idea. it's not a image on a light for godsake. it's projecting an enviroment like a Gobo in the Theatre allowing you to match the lighting of an enviroment. it's simple to understand... if you want to that is, which given your track record you don't.

oh and

Never-ever seen an image based light in real life so???
Show me ONE.

*here - http://goboman.files.wordpress.com/2010/04/gobo-lens-003.jpg a real life IBL. aka a Theatre Gobo.