In beta area highlights can be turned on with 
the area_illumination keyword in an area light,
but it's still a plane. With orient you can face
that plane to the objects though. Unless the
shape of the lights are really critical that would
be easier. If not you can just use a line of
area lights with area_illumination on.

In 3.6 area lights only effect the shadows,
so you get stuck with multiple lights.

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