How to stop horizontal scrolling lines caused by fluorescent light (USA and NTSC)?
These lines exist because the refresh-rate of the light is different and undividable by your framerate. One solution is to set the framerate to the Hertz of your light (which must be known for this case) or to use a light with a refresh-rate that is dividable by your framerate. If none of this is possible, you can still try to deflicker footage using deflicker gizmos for nuke, which work the best from my experience. This should always be your last option though, since the result will not look stunning.