The final scene can be found on the Learning Scenes page.

 

Built-in LPE AOVS
Custom AOVs
Light Groups and LPEs
Custom Shaders

 

LPE (diffuse) 'CD<RD.*' viewed in Arnold IPR Window

 

Custom AOV with LPE added in its Attributes

More information about per-light AOVs can be found on the AOVs and lights page.