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This page describes the use of V-Ray photometric lights.
Overview
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Visualizing IES Profiles
The properties of an IES file can be visualized with Photometric Viewer software, which you can easily find online. Visually, the IES profile uses a graphed curve to show the shape and intensity of the light's emission. Depending on the software used, you might also be able to render a grayscale representation of how the light will look in a scene. Using a Photometric Viewer will help you better understand how the IES files you are using will affect your scene's lighting.
The graph below shows the IES profile of a typical bollard or post light, a type of light commonly used in architectural outdoor scenes. The rendered thumbnail is shown as an inset.
Parameters
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Example: Shape
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.
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