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Enabled – Turns the light on and off.

Invisible – Controls whether the shape of the Rectangle Light source is visible in the resulting render. When disabled, the source light is rendered in the current light color, otherwise the light source itself is not visible in the scene.

Note: This parameter only affects the visibility of the light when seen directly by the camera or through refractions. The visibility of the light with respect to reflections is controlled by the Affect Specular and Affect Reflections options.

Is Disc – When enabled, the light is in the shape of a planar disc instead of a rectangle.

Width – Determines the width of the light measured in scene units.

Height – Determines the height of the light measured in scene units.

Directional – When this value is 0, the light is spread out equally in all directions. Increasing this value makes the light beam more narrow and concentrates it in one direction. For illustration, see the Directionality example.

Directional Preview Length – Specifies the length of the cone used to preview the Directional parameter in the viewport. This parameter is available only when Directional is greater than 0.

Directional Strength – Controls the strength of the directional distribution.

Object ID – Specifies an integer object ID to the light.