The Spotlight Distribution node can be used with an Octane Area Light or as part of an emission material on a polygon to create a realistic spotlight behavior, without the need of an IESAn IES light is the lighting information representing the real-world lighting values for specific light fixtures. For more information, visit http://www.ies.org/lighting/. texture (figure 1).
Figure 1: The sphere object on the left is a normal emissive object with the spotlight distribution node attached, the light on the right is a volumetric spotlight using the Spotlight Distribution node
Orientation- Determines how the cone will be oriented; the choice will use the coordinates in the Direction or Target edit fields.
Direction or Target - The direction of the light or the target object.
Cone Angle - The angle of the actual cone. Smaller values produce a tighter cone.
Hardness - Sets the hardness of the penumbra (cone) boundaries. Lower values produce a softer look.
Normalize Power - Keeps the emitter angle constant when the angle changes.