Cylinder lights are typically used to simulate fluorescent tube lighting The cylinder light shape simulates light from a cylindrical area source (tube shape).
Radius
Increasing the size of the cylinder light will create a larger area light size and therefore will soften the shadows that run perpendicular to the cylinder’s axis. Cylinder lights will always be circular. It is not possible to scale the width to create an ellipse.
Height
Scales the height of the light.
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Atmosphere Volume enabled
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Further examples