Hi, sometimes we need a source of directional light. We must have light source, a shape like rotary fan, a custom render setup and finally post production. All this for a solid light effect and a lot of time for rendering.
Why we don't have the ability to Emmett light from photo white region and we have the ability to define the light strength, opacity, light distance, the rotation of image to have the illusion of rotary fan or other effect, etc...?