Hi @edsager,
Face_425a49ee is the name of the polygon. It was probably generated at random by the program that wrote the file.
If you want to learn how Radiance works, you can read Rendering with Radiance. Also, refman.pdf is useful for learning the Radiance syntax.
I am not familiar with the perforate.cal file that you are using. It is not one of the files distributed with Radiance. Who gave it to you? Is the author named in the file’s comments? Perhaps you can ask them for an explanation of how to set the hole size and spacing.