Painted Scene with Lighting I have a more general question about lighting a scene with painted material.

Since I have created a scene in which I want to paint all the textures I am now confused after watching some tutorials. People always draw lights and shadows on the objects. But when I decide to change my lighting setup wouldnt I have to start over? I can not really describe what I am meaning so I will explain it in a picture.



Lets say I was painting my cube like in case A. Now the lighting changes and comes from the right like in case B. Sine I painted the object like the light would come from the left.. it now wont fit when the light comes from any other angle and casts shadows in a different direction. 
So when I am doing a full scene do i just have to accept that it is just used for one lighting setup?
If you look closer to this tutorials, you'll notice, that they don't really paint lighting conditions but more like Ambient occlusion and some highlights, that are similar for each side of the object. In the tutorial you linked to, you can see the same amount of shadow under the top part on each side, The same with the highlights on cracks and tiles. The same on each side.Try to copy this effect while creating your painted textures. This will suggest some details, but won't interfere too much with added lighting.