LIGHT OBJECT: Geometry Light

Geometry Lights allow the user to select geometry and make that object emit light from its surface. This light is essentially an area light as it shares parameters under the Area Light Options tab.

To turn an object into a geometry light you can select the geometry node you would like to become a light and then select the 'Geometry Light' shelf button. The user can also turn an object into a light by changing the Light Type  of the Light Object node to Geometry and by putting the path to the geometry in the Geometry Object field. The user can also put a texture map on the geometry by placing an image in the Texture Map field.