The purpose of exterior light is to illuminate the exterior of a scene:
to make the set look more realistic
to add light and sparkle to scenes
to provide illumination while filming
It features characteristics that are optimised for Arnold rendering.... Select Arnold from the list in the Command Panel's Create panel ()> (Lights) to open the Arnold lights, Select Arnold Light from the Object Type drop-down menu.
Indirect Lighting Controller.
Screen-Space Global Illumination.
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