Those three videos were taken with the PWM-switched spotlight at three different PWM frequencies of the LEDs:
  1. PWM frequency 73.2 Hz
  2. PWM frequency 146.4 Hz
  3. PWM frequency 1,172 Hz
All but the last PWM frequency show interferences with the camera at smaller intensities. Even 586 Hz shows inferences, but only slightly. So better choose the highest frequency or the linear version.

Here is the linear version at work:
  1. Linear version


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