Starting with version 1.5, SCS Blender Tools features easy to setup scene lighting by using game sun profile data. SCS Lighting panel can be found under World tab inside Blender properties window.
You may use it for best in game like preview of your model inside Blender 3D viewport. To get it work, you only have to search for a sun profiles SII definition file and then click on the button () beside desired sun profile entry in the list.
Note: While using SCS Lighting make sure to delete any lamp objects from your scene, otherwise you won't get proper lighting result.