Our current designs include infrared sources embedded within the table surface so that the surface can act as a motion sensor even when there aren't external infrared sources.
Also, you could always add a single low-power halogen pointing *at* the table, if you wanted to enhance the effect or create shadows. You certainly don't have to switch your whole house to inefficient lighting.
-Windell.
Windell H. Oskay
drwho(at)evilmadscientist.com
http://www.evilmadscientist.com/
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Evil Scientist
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Registered: 06/15/06 Posts: 1932
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