Trouble taking Darks

[IainMcD]

I'm having a bit of an issue when I take darks.

I keep getting this weird glow, in every sub over 5 seconds. Here are some examples, ISO800, varying lengths.

I'm worried somehow my camera is damaged. I'm using a Canon 1100D. Is there anything I can do about this? Should I be concerned?

http://i97.photobucket.com/albums/l219/Iainftw/test4405.jpg

http://i97.photobucket.com/albums/l219/Iainftw/l_test4403.jpg

[StuW]

Light ingress from the back of the mirror or some other area maybe? Doesn't look like amp glow.

[IainMcD]

I'll try again in a pitch black location, I had hoped it would be something as simple as light from somewhere sneaking in. Not sure how it's doing it though......