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Cheap LED lighting typically uses full-wave rectification and strobes at double the AC line frequency, so 120Hz or 100Hz depending on region. It's the same flic
by mrob 3y ago
Cheap LED lighting typically uses full-wave rectification and strobes at double the AC line frequency, so 120Hz or 100Hz depending on region. It's the same flicker as seen with magnetic ballast fluorescent tubes, which also lit up on both halves of the AC waveform. I personally find 100Hz flicker annoying. Many LED lights are available with better power supplies with no visible flicker.
Half-wave rectification is possible, but I've personally only seen it in indicator lights, not room lighting. I imagine 60Hz or 50Hz strobing would be unacceptably annoying even to people who are not sensitive to flicker.
- fellerts 3y agoI'd argue LED flicker to be more noticeable than fluorescent or incandescent flicker because LEDs typically go from 100 % brightness to 0 % brightness in one cycle. Incandescent lights dim smoothly, so you don't get the "phantom array" effect. Fluorescent lights actually go through a range of hues during a cycle but typically don't reach complete black.