I think this is part of the early stages of the render. Once a higher SL is reached the stripes will disappear.
A few of my 5K renders have these stripes to about SL10 or so, once past that SL, they have gone.
I don't have an image showing this, to post here I'm afraid. However they are present at the bottom of the frame, in this previz low SL, multilight animation I made last year.
http://video.google.co.uk/videoplay?doc ... &plindex=0
Tim.
http://emp3d.com
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