Adjust the cone radius manipulator to change the angle of a spot light’s beam. Only the spot light includes this option.
To show the manipulator, see Display > Show > Light Manipulators. See Show, hide, or resize a light manipulator.
If you have enabled the Show Decay Regions for Penumbra option in the Preferences window, the cone angles appear with solid lines while the penumbra regions appear with dotted lines. Move the cone radius manipulator to adjust the angle interactively.
