The Distribution (Photometric File) rollout appears on the Modify panel when you create or select a photometric light with a photometric web distribution. Use these parameters to select a photometric web file and to adjust the orientation of the web.
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Create panel > 
(Lights) > Photometric > Create a photometric light. > General Parameters rollout > Choose Photometric Web File as the distribution type. > Distribution (Photometric File) rollout
Interface
- Web diagram
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After you choose a photometric file, this thumbnail shows a schematic diagram of the light’s distribution pattern.
Thumbnails of photometric web files
The bright red outline shows the beam. For some webs, a darker red outline shows the (less bright) field.
- Choose Photometric File
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Click to select a file to use as a photometric web. The file can be in the IES, LTLI, or CIBSE format. Once you have chosen a file, this button displays the file name (without the .ies, .ltli, or .cibse name extension).
While you browse for a photometric web file, the file dialog also shows the thumbnail for the highlighted file.
- X Rotation
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Rotates the photometric web about the X axis. The center of rotation is the photometric center of the web. Range=–180 degrees to 180 degrees.
- Y Rotation
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Rotates the photometric web about the Y axis. The center of rotation is the photometric center of the web. Range=–180 degrees to 180 degrees.
- Z Rotation
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Rotates the photometric web about the Z axis. The center of rotation is the photometric center of the web. Range=–180 degrees to 180 degrees.