Area lights have many additional options. Most importantly, any geometry
can be selected to act as "geo light"
Light Spread
Specifies the spread of the light. A spread of 1 is to natural "cosine" spread. Lower spreads will produce a more focused light. From left to right: 0.5, 0.2 and 1.0 (default).
Gallery includeLabel light_spread
Normalize Intensity by Area
Visible to Primary Rays
Makes area light visible to primary (a.k.a camera) rays. From left to right: off (default) and on.
Gallery includeLabel area_visible_to_primary
Two Sided
When enabled, area light will illuminate from both sides. Note that this has no effect with the sphere shape. From left to right :
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Default Shape
Allows you to select the shape (left to right): square, sphere, disk and cylinder.
Gallery columns 2 includeLabel area_shape
Select Geometry ...