The Area light in Blender® is the only light type from the program that OctaneRender® supports. After creating the Area light, you can adjust its settings in the Lamp tab.
Figure 1: Area light settings
To use the Area light, connect a DiffuseAmount of diffusion, or the reflection of light photons at different angles from an uneven or granular surface. Used for dull, non-reflecting materials or mesh emitters. material and a Blackbody or Texture emission to the Light Output node.
Figure 2: The Blackbody emission is connected a Diffuse materialUsed for dull, non-reflecting materials or mesh emitters., which is connected to the Light output