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Light Shape – Controls the shape and orientation of the light (listed below), which in turn affects the softness of the shadows generated by the light. You can choose between using the shape specified in the IES file or pick an arbitrary shape and control its size with the Width, Length, Height and Diameter parameters to affect its shadows.
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Sampling
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Light cut-off Threshold – This parameter specifies a threshold for the light intensity, below which the light will not be computed. This can be useful in scenes with many lights, where you want to limit the effect of the lights to some distance around them. Larger values cut away more from the light; lower values make the light range larger. If you specify 0.0, the light will be calculated for all surfaces.
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