> When I started to test the neon tubes for the exhibition rooms'
> illumination, I noticed a strange behaviour of the area_light: although
> I defined center and size of the area light correctly, the light
> concentrates in one point! Moreover, the looks_like object (a union of
> two narrow cylinders) is cut in half!

You have two different issues here:

- The historic area_light code is only designed to generate soft 
shadows; other effects (highlights and - as in your case - 
distance-based light fading) remain as per a standard point light. (The 
area_illumination switch introduced with 3.7 does fix this for 
highlights, but not for distance fading yet.)

- As for the looks_like object, note that you need to specify that 
object as if the light source was located at <0,0,0>; it will 
automatically be translated to the true position of the light source. (I 
just noticed that this doesn't seem to be mentioned in the docs. I'll 
take care of that.)

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