User Guide > Rendering and Render Setup > Lighting > Basics of Lighting > Position features of a
light interactively >
Move the Penumbra Radius
of a spot light
Move the Penumbra Radius manipulator to change how the brightness of a spot light beam decreases only near the edge of the beam. Only the spot light includes this option.
To show the manipulator, see Show, hide, or resize a light manipulator.
