http://salvador.mata.com.mx/blog/how-to-light-setup/
How to´s – Light setup, mist settings and 2DFilters
Some people asked me about what technique did I use in my fly thru/walk thru of my projects in the Blender Game Engine, so that’s why this video.
This is how I do my light setup in blender, in this video I didn’t take care about UV’s optimization and other things because I’m focusing on demonstrating the way I use to.
Some facts:
1.-Why I didn’t use « Light map UV pack » ?? – That is because it take into account non square polygons as square polygons, hence a lot of image distortion is generated. I don’t like that 
2.- Why did I left empty spaces in UV maps? – This is just a practical example, I didn’t focus in optimization, but you should use wisely all you maps 
3.- What about 2D Filters and shaders, where can I get it? – Look for it in blenderartist.org, I usually use SSAO, retinex and bloom in my scenes, there is a version for 2.49b and the new stable releases.
4.- Mist in world buttons seems to don’t have exposure controls (as 2.49b does) so expect different results in both versions, I will ask Ton for that :/
Hope you find this usable, if still having some questions feel free to comment here
Still very un familiar with 2.6x.. yeah..
Get the blend file from this locations:
http://salvador.mata.com.mx/blends/Light_mist_2dfilters.rar
https://dl.dropboxusercontent.com/u/2701022/Light_mist_2dfilters.rar
Voir sur youtube
Build a Complete Wild West Scene in Blender!