Why do LED headlights flicker when being viewed through a camera or recorded video but not when you look at them with a naked eye?
In: Technology
Pulse width modulation: keeping LED’s on for a short burst, and off for a short burst (usually shorter off times) to save electricity, reduce heat output, and create a ‘dimming’ effect for LED’s, because LED’s can’t be dimmed by lowering voltage.
So when an LED is on a PWM circuit, and a camera records it, the light will blink on the recording/playback, because the LED is blinking at a different rate that the camera shutter speed is capturing the video.
If you have the ability to ‘shake your eyes (see ‘nystagmus’) you can see the effect IRL, or if you look toward, or away from a set of taillights of cars that have this effect (Cadillacs have, im my opinion, the best viewing ability for this effect) you’ll notice in your peripheral vision dots or dashes of light (depending on how fast you adjust your gaze)
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