> I use several area lights in my scene which highlight objects on a somewhat
> reflective plane. However, the light doesn't fall off completely smoothly but
> there seem to be darker concentric lines around the highlighted areas. The lines
> are virtually absent (or overlapped) in well light areas but become noticable
> (with decreasing interval) in parts where the light starts to fade.
>

Why don't you post one of the output images (not just a screenshot) so 
we can view it on our computers and confirm that it's not just a display 
issue?

If it's an actual output problem, what version of POV-Ray are you using?

  - Slime

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