shape – Specifies a shape (and its orientation) for the IES light when override shape is enabled. Some shapes (shown below) enable additional options for size. See the Shape example below.
Exclude – Brings up the 3ds Max include/exclude button which allows the user to exclude objects from illumination and shadow casting.
This example shows how light is affected by the different shapes of the IES Light. Circle and Sphere shapes examples are also compared with different diameters - 1.0 and 10.0.