Hi.
I have some trouble with “long” lights (neon type lights).
The test scene is just a simple room with a small pillar in front of a static omni light (radius 5, length 500).
And this is what I get (Oo) :
http://tof.canardpc.com/view/5d027dd3-9099-4dea-8ce5-a7a99fe5a8bf.jpg