exposure: Specifies the intensity of the area light as a power of 2. Increasing the exposure by 1 will double the energy emitted by the light source. A value of 0 produces an intensity of 1 at the source.
rman__EnvMap: Environment map to be used for IBL
envTint: Tint the environment color by this color.
enableTemperature: Enable plausible color temperature.
temperature: Allow the user to choose the color temperature of the light. Unlike the basic light color this allows the user to easily pick plausible light colors based on standard temperature measurements in Kelvins. Defaults to 6500 K, the D65 illuminant used by sRGB and Rec. 709.
specAmount: Scale the specular contribution of this light.
diffAmount: Scale the diffuse contribution of this light.
fixedSampleCount: Overide the automatic sample allocation and use a fixed number instead. Values smaller than 1 disable this feature.
importance: Overide the automatic sample allocation. An importance of 2 will allocate twice the regular sample budget to this light.
enableShadows: Enable raytraced shadows.
shadowColor: The color of the shadows cast by emitted light.
shadowMaxDist: Limits the shadow distance. Any value smaller or equal to 0.0 will be ignored and the shadow distance will be unlimited. Defaults to -1 : unlimited shadow distance.
shadowTraceBias: Raytracing bias for shadow computations. -1 uses automatically computed value value.
shadowSubset: Set of geometry to consider for traced shadow intersection.
shadowExcludeSubset: Set of geometry to ignore for traced shadow intersection.
__group: The group is a special type of attribute which allows you to provide light category support for geometric area lights, as well as per group AOVs for the lighting on the surface.
intensity: Specifies the intensity of the area light. Always leave at 1.