LED lights often flicker on camera because they use Pulse Width Modulation (PWM), which rapidly switches the light on and off to control brightness[5]. While your eyes average these pulses into a steady glow due to visual persistence, a camera captures individual moments[5][6]. If the camera's shutter speed or frame rate captures the light during its 'off' cycle, you see dark bands or pulsing[5].
To prevent this, the PWM frequency must be significantly higher than the camera's frame rate, ideally 30 times higher or more[5]. Matching your shutter speed to the light's frequency can also help the camera integrate the light more consistently[5].
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