Sorry folks!
Here is the actual link to HDRshop and lightgen
https://www.debevec.org/HDRShop/
Also, that link will tell you all about HDRI and GI in general
Good luck, and when you're done, let's see your HDRI and/or GI Maya images in the new GALLERY section!
Thanks!
Israel "Izzy" Long
Motion and Title Design for Broadcast-Film-DS
izzylong.com