Yes, my book is available. See my signature for ordering instructions.
The book makes a clear case for not using architectural light fixtures as the means to light the space. Instead it demonstrates how to use the equivalent of photographer’s lighting and reducing the fixtures to mere props in the scene. The principle is to float radiant panels appropriate to light appropriate to each camera viewpoint.
The book talks about using a ”constant” reflectance shader to create the look of a glowing fixture - without emanating light.
I don’t understand your issue with using the general light [the old one that casts no shadow that I placed in the GDL Object Depository, not the new Archicad 11 one that is useless.] because you can add thousands of general lights in a scene without extending rendering time significantly. In the book I show a theatre marquee solution using general lights, for instance.
If you dislike general lights, use a light cone like almost every fixture in the library does.
Dwight Atkinson