I use cones to make it look like a spotlight.
Spotlight on the left On the right is the cone.
I would like to add a smear effect or something else to make it look a little more like a spotlight.
Blender Stack Exchange is a question and answer site for people who use Blender to create 3D graphics, animations, or games. It only takes a minute to sign up.Sign up to join this community
A trick that you can use to create a blurred light beam, whether you are in Cycles or Eevee, is the Layer Weight node : Mix an Emission with a Transparent, use a Layer Weight (Facing output) as factor, play with the Blend factor:
Layer Weight considers the direction of your normals, in my setup, if the normals are perpendicular to the view, the faces will appear transparent.