Thank you ! It is a great idea, I tried it, it works but I cant seem to have much light at the base of the cones like in your picture.

Also the light does not take into account objects that should "break the cone" of medium light.
Anyway I need to render an animation and I think it will cost too ...

Hello everyone !

In my current project I am making a 3D poster with a disco ball and I try to replicate the effect that can be seen on the youtube video below

https://www.youtube.com/watch?v=s0wYCLa-8VY

I tried to replicate the light beams with the Glare post effect but I'm not totaly satisfied ...