A&D Self illumination looks wavy

[TSuess]

I have a cove lighting detail that runs along a curved wall. I figured the best way to do this was by using an A&D self illuminating material. But I'm getting a wavy effect on the wall as the distance from the light source increases. Anyone have any ideas how I could make this effect more realistic?

 

Thanks

[mattclinch]

have a look here.

 

http://www.maxforums.org/threads/mental_ray_glow_problem/0001.aspx

 

and here

 

http://forums.cgsociety.org/showthread.php?t=543646