LuxRender: Orienting IES Lights

I have a simple scene setted up in blender with a simple light ( a plane ) with the following IES Profile:

However, no matter how I rotate the light on the local Z axis, it won’t change direction.

Here a screenshot of blender with the light selected rotated in both ways:
And here the render of the scene identic for both configuration:

Anyone knows how to achieve the rotation?

Thank you in advance!