light_environment shining through doors.

I am unsure as to how to stop the light from light_environment from leaking it’s light through doors.
Is there a value I have to set first?

http://farm8.staticflickr.com/7101/7223639372_8d223089bc_b.jpg

http://farm8.staticflickr.com/7096/7223639134_4fdebfec99_b.jpg

EDIT: Fixed the pictures. Also, thanks for your answer, it works for me.

Put a block light brush in the door way.