Lighting an Interior Nighttime Scene Using IES Lights - Photographic Rendering with V-Ray for SketchUp - page 90

When it comes to creating photorealism in our renders, there is no doubt that having
a collection of IES files (preferably categorized and catalogued) along with at least
one viewer application can often prove to be an invaluable source of help when it
comes to setting up realistic interior lighting rigs.