Area lights cannot be applied to circles or ellipse elements.
Area lights can only be applied to Shape elements (type 6), circle/ellipse elements (type 15) are not allowed.(The shape element has to be a convex polygon, meaning all corners have to point outward.)
The circle or any roundedshape will need to be "Stroked" to many triangles, which would effectively create multiple light sources. This would drastically effect rendering performance; not something most would want to sacrifice just to be able to use circular area lights.
Use the "Place Polygon" tool and set the edges to a number like 64, which would generate a somewhat circular polygon, which can be used as a light.
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