Bad lighting on prop_static

[aliensoldier]

Hey everybody!
I got a little problem with a map for my Portal 2 Mappack I'm currently working on.
I have no idea what could cause this problem, there's only one prop_static which looks like this ingame:

[img]http://dl.dropbox.com/u/55572802/Public/2012-02-07_00002.jpg[/img]

I already tried out to lower the brightness of the light entities and used a info_lightning, nothing worked.
Please help me!
Thanks for every answer. :)

[[yournamehere]]

Please post in question megathread, it helps consolodate as people mess up in hammer a lot, it's easy to make mistakes in it.
Typically you're origin (red x when you move it) is in a bad spot like inside a brush.