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Enabled – Enables the IES light.

Power – Specifies the intensity of the light in lumens (lm). When a value of 0.0 is used, the default luminous power from the IES profile is used. For illustration, see the Power example below. 

IES Light Shape – Determines how the shape of the light specified in the .ies file is taken into consideration during the calculation of shadows.

From File – Uses the shape information stored in the .ies file.
Rectangular
Circular – Treats the light shape as a planar circular area light. Its dimensions can be specified with the diameter parameter below.
Sphere – Treats the light shape as a sphere light. Its dimensions can be specified with the diameter parameter below.
Vertical cylinder
Horizontal Cylinder Oriented Along Luminaire Length
Horizontal Cylinder Oriented Along Luminaire Width
Ellipse Oriented Along Luminaire Length
Ellipse Oriented Along Luminaire Width
Ellipsoid Oriented Along Luminaire Length
Ellipsoid Oriented Along Luminaire Width
Elliptic cylinder
Horizontal Elliptic Cylinder Along Luminaire Length
Horizontal Elliptic Cylinder Along Luminaire Width
Vertical Circle
Vertical Ellipse
Cuboid

IES File – Specifies an .ies file to use for the current light.

Length – Specifies the length for applicable IES Light Shape types.

Width – Specifies the width for applicable Light Shape types.

Height – Specifies the height for applicable Light Shape types.

Diameter – Specifies the diameter for applicable Light Shape types.

Color – Specifies the color of the Photometric Light.

Filter Color – Specifies a color multiplier for the light.

Rescale Max Intensity – When enabled, the intensity values of the IES file are scaled so the new maximum value is set to the New Max Intensity parameter.

New Max Intensity – Specifies the new maximum intensity after rescaling the intensities in the IES file, when Rescale Max Intensity option is enabled. The value is in cd (candela).

Illumination Mask – Specifies which objects to be affected by the V-Ray IES light.

LPE Tag – Allows you to specify a string tag that can be used in a Light Path Expression to isolate the contribution from this light. See the Advanced Light Path Expressions page for more information.