Machine lighting should overwhelm windows, skylights, room lights, and beacons so the image does not change with the shift or the weather. Shorter exposures, made possible by that brighter controlled source, reduce the distance a vibrating part travels while the shutter is open. Blocking ambient light is the other half.
A beacon in the background can create a highlight the tool interprets as a missing feature or a false edge. A spotlight used deliberately as pollution against another source makes the same point in a lab. Consistency of reflection also depends on part presentation. A loose nest lets a shiny part roll, and the specular stripe moves even if the lamp did not. Strobes can aggravate photosensitive conditions. UV and IR are invisible and still hazardous. Intensity, distance, and duration for non-visible sources should be documented, not discovered by leaning into the station.