Quote - > Quote - > Quote - So ... how do you use these, where are they installed? 

They are not "installed". You save them to disk anywhere you want. In the Reality light editor you add one of those files to any light that you want to turn into the light descibed by the IES file.

Cheers.

When you say light editor do you mean a file you have to open up?  Is there something in RUG about this?  

 

Yes its in the RUG