Now all mixed and using global_settings - ambient_light set to white:
The material settings of the left image Ambient was set to 1 and for the right one it was set to 0. (the spheres and floor has its Ambient set to 0.2 and 0.4, respectively)
The material settings of the left image Ambient was set to 1 and for the right one it was set to 0. (the spheres and floor has its Ambient set to 0.2 and 0.4, respectively)