Also remember that the rather basic rendering engine in Poser does not work with ray tracing, radiosity and other advanced features. This means that light will not bounce around in the room. It will only shine where you point it. Given these restrictions in the Poser rendering engine, the placement of individual lights becomes more critical. When using spotlights, make sure to play with the "Angle Start" and "Angle End" dials. These controls the "spread", the size of the light cone. As default, it's set as a quite narrow cone, so it usually needs to be adjusted when creating a spot light.