I know how to create spherical gradient textures for objects and I also know how to assign image and radial gradient textures to spotlights. I am struggling however with the spherical gradient on spotlights.
EDIT: This is not a duplicate of the IES light question, I am specifically asking how to do this with a spot light and without an image, which proved possible (see accepted answer).
I want to achieve this, but without an image.
EDIT: this is the nodetree that worked,
thanks to Secrop's answer. Funny thing, I already had Z scaled to 0 for the image texture.