PWM = pulse width modulation. A square wave where the "on" time of the wave is varied from 0% (e.g. off, or 0V) to 100% (e.g. completely on). The frequency of the wave stays the same, its just the width of the on time (and off time as well) that changes.
Thus you may notice some flickering in the lights (especially at the dimmest settings).
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