The beauty of IES files is that the format is universal. A file you download for 3ds Max works perfectly in SketchUp’s V-Ray or Enscape. Because they are provided by lighting manufacturers, the best libraries are often free.
If you're writing a paper combining IES lighting simulation and SketchUp, here's a compelling idea: download ies light sketchup
Most professional IES files are provided for free by actual lighting manufacturers. Here are the best sources for high-quality downloads: IES Lights in V-Ray for SketchUp | Free IES Lights Pack The beauty of IES files is that the format is universal