Hello there. I am using this plug-in named Saber for after effects, and I have some issues. I'd like to know if there is a way to hide that light, it looks like there is a box and the light stops there. I attached an image so you can see what I am talking about.
The box effect is probably caused by the layer on which you applied the effect being too short in height; try applying the effect on a bigger solid layer, so that the boundaries are out of the comp and not visible.