I know of no better (or even alternative) resource for illumination with the LightWorks engine in ArchiCAD other than Dwight's book. He provides info in his signature... a recent post is here:
http://archicad-talk.graphisoft.com/viewtopic.php?p=220509#220509
Also for sale here, where you can click to view some sample pages such as illumination by candelight.
http://www.cadgarage.com/neliinarbo.html
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