Guerilla can light the scene using IES profiles.

Use an IES profile
  1. Press Ctrl+Space to open the Node Picker.
  2. Type "IESLight". This action creates a new IES light, usually called IESLight at the root of the scene.
  3. Set the IES filename in IESLight > Shader > iesfile
A volumetric scene lit with 3 symetric IES profiles A volumetric scene lit with an asymetric IES profile