I understand why we see them flicker in videos, but why do LEDs flicker at all when they’re powered with DC?
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LEDs don’t dim evenly – you get colour changes and the dimming is not consistent between LEDs, even if their full brightness is consistent.
In cars, it is desirable to have LEDs all look evenly bright, even when the lights are dimmed – for example, tail lights might be dim when just the headlights are on, and the brightened when the brake pedal is pressed or the fog lights are on. Similarly, different countries have different regulations about daylight running lights – so some cars may have to have a higher brightness set. The DRL may also need to dim, if the turn signal is on.
In order to get reliable dimming with LEDs, it is better to run them at full power but pulse them on and off. If they are on half the time, then they are exactly half as bright, and all the LEDs dim consistently.
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