Click Render tab System panel Autodesk Rendering .
On the Autodesk Rendering window, Rendering toolbar, click Create Light drop-down Web Light .
Click in the Scene View to specify a location for the light.
Click to specify a direction. When the light gizmo is displayed, use it to adjust the web light's position and target.
On the Lighting tab, click the Browse button in the Web File field, and then select an IES file. The light has been changed to use the web settings from the IES file.