12.4.1 Area light attributes

Area Light Attributes section in the Attribute Edtior of the Maya Area Light
The attributes supported by Iray for Maya are Color and Intensity.
Adjust the color of the emitted light
Adjust the intensity of the emitted light
Area Lights in Maya are able to send out light without light decay. This is different in Iray for Maya because in reality light always has a decay over the distance. So it is usually necessary to increase the intensity of the Area Light to see any lighting effect.
Area Lights rendered with Iray for Maya 2.0 will only cast hard shadows.