In this demo we load an interior HDRI map that includes a selection of Windows and Lights. We use Composites to separate the ambient lighting effect of the HDRI map, and to create individually controllable light sources. The result is an identical HDRI map, but with the ability to individually adjust the brightness of each light source. You would want to do this to gain more creative control over the lighting effect of the HDRI map. For example, removing unwanted lights, boost the brightness of a light or balancing the lighting.