Thanks Alekssander, e-on call this type of light "volumetric light" and in fact it's most a type of light which can interact with atmosphere in the volume of the cone. That's interesting, to play with light in such a way, and as Guitta showed, to have more control on light (compared to previous versions). For example, I always have the problem of a light which is near a surface and produce strong spot effect, and this can be avoided with quadratic light ;=) Yves