Shape Allows the selection of one of the default shapes (square, sphere, disk and cylinder), or specify a custom geometry (the mesh of a torus shaped filament in this example). Visible to Camera Makes the light source visible to the camera (a.k.a primary rays). From left to right: off (default) and on. Two Sided When enabled, the area light will illuminate from both sides. Note that this has no effect with the sphere shaped area light. From left to right: off (default) and on. 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: 0.2, 0.5 and 1.0 (default). Normalize Intensity by Area This will devide the total intensity of the area light by its area. The net effect of this is that no matter the scale of your area light, the intensity will remain the same. This non-physical behaviour can be handy when adjusting shadows from area light: shadow softness adjustments (area light size) will not change the overall intensity. From left to right: off (default) and on.
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