Vray Lights showing the undesired shape under env fog

#1

Hi, everyone. I am working on a vray project. I have used some vray lights
in my scene. While I was trying some environment fog, I could see the shape
of my vray lights even though “invisible” check box is turn on. I tried to play
around the attribute spread sheet setting but couldn’t really sort out why. In
the image, you can see top right and top left both have some square shape
and those are the lights I am talking about…any idea?? thank you

If the image is not showing up, here is a link to it.
http://imageshack.us/photo/my-images/195/vrayjz.jpg/

#2

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