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Thats the first thing I tried. The mesh light created very even illumination, but what I wanted were deep shadows that derive from a single point light. I also wanted a warm color to the render, like that created by an incandescent bulb. At this point, I have to learn how lighting in Lux works before I can use the render engine properly.

 

 

Now I understand what you are trying to do and yes the mesh light does gove even lighting.  TYhe section on lights in the manual is very good and cover the differences in the way Luxrender uses lights to Firefly.  Certainly the there are differences and shadows is one aspect that appears to be very different.  Anyway I am off home to play and see if I can get my head around this. 

Lighting is something I'm always trying to get my head around better than what it is.  On the warm tones deal though; try fiddling with some of the film responses.  I've found that using Kodak Portra 160 NC produces very nice warm flesh tones.