Why do LED lights flickers when seen on film/camera?
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Notice that this effect is most common in bright lighting conditions, because the easiest way for digital video sensors to adapt to brightness is to vary the exposure time. In sunlight they might only be capturing light for a thousandth of a second, doing so 60 times per second. As the LEDs are turning on and off quickly, it can happen that the camera isn’t capturing light at the same time as the LEDs are producing it. Generally the camera and LEDs work at different rates, so sometimes the camera sees the LEDs and sometimes not, giving a flickering effect that’s much slower than the real rates of flickering.
It’s like two cars with their indicators on: sometimes they’re in sync and then a little while later they’re out of sync. The indicators flash relatively quickly but they go in and out of sync over a much longer cycle.
In dim lighting, video cameras are capturing light most of the time so LED flickering effects are much less noticeable.
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