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Power-line flicker is a visible change in brightness of a lamp due to rapid fluctuations in the voltage of the power supply. The voltage drop is generated over the source impedance of the grid by the changing load current of an equipment or facility. These fluctuations in time generate flicker.
In visual perception, flicker is a human-visible change in luminance of an illuminated surface or light source which can be due to fluctuations of the light source itself, or due to external causes such as due to rapid fluctuations in the voltage of the power supply (power-line flicker) or incompatibility with an external dimmer.
A system may flicker (jump between basins of attraction) as it approaches a critical transition. Power-line flicker, a fluctuation in the voltage of AC power lines, whose compliance is regulated by IEC61000-3-3; Flicker noise, electrical noise with a 1/f spectrum.
Furthermore, external factors such as incompatibility with dimmers or presence of mains-supply voltage fluctuations (power-line flicker) play a role and may cause additional temporal light modulations. TLMs can be designed-in fluctuations from the electronic driver because of application of certain driver or light-regulation technologies.
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Distortion of the power line voltage due to non-linear loads such as rectifiers. H-bridge An array of four controlled switches that coverts direct current to alternating current, with peak value equal to the supply voltage. HDTV High Definition Television, any television system with more than 625 scan lines. headphone
Lights flickered, a subway line was disrupted and some elevators and escalators briefly stopped running when a small explosion at an electrical facility caused a momentary power outage in New York ...
Power source technology (driver, electrical ballast): Many types and topologies of LED drivers and electrical ballasts are applied; simpler electronics and limited or no buffer capacitors often result in larger residual current ripple and thus larger temporal light modulation.