how to remove streaking/ motion blur(?) of light in rendering

I am trying to create a looped video so the first and last frame has to be the same. The only change is my rotation (0 or 360 degrees) of the light but the frames look quite different because of the motion blur on my last frame

I have tried

  1. in camera and post processing make motion blur settings to 0
  2. in editor - render setting uncheck motion blur
  3. Tried to render a 0 to 720 degree rotation, so I can use 360 - 720 degree but unfortunately the frames look a bit different.

Specifically this light effect created is a Blueprint Actor setting. I am very new to blueprint actors so might be a mistake there -

Frame 0 (0 degree)

Frame 1800 (360 degree)

Any other ideas or workaround would be appreciated, thank you!