It's really wierd and annoying, any light source seems to quickly flick to a less intense version as I approach it. Very odd.

This is from a distance:
http://cloud.steampowered.com/ugc/487751575540140406/DA478DA1FEBE8621FA4F67E8DD809347BEE5985F/

As I approach, see how it looks darker, this change is sudden not gradual.
http://cloud.steampowered.com/ugc/487751575540139403/63B614F99C0AD10977CF2AEADF20C88C44C631F2/

Try http://www.gamesas.com/topic/1342196-lightshadow-change-when-approaching/page__fromsearch__1.