A suggestion - once you have set up the IDL Studio lighting and render settings, save the "empty" scene as a pz3. You can then import this whole IDL light set-up to a scene you have created by  - File/Import/Poser document/Prop.

Much better than having to re-set-up the lighting each time you want to use it. Delete all the existing scene lights before you import the IDL scene or you'll have to find and delete them manually.