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Temporal light artefacts (TLAs) are undesired effects in the visual perception of a human observer induced by temporal light modulations. Two well-known examples of such unwanted effects are flicker and stroboscopic effect. Flicker is a directly visible light modulation at relatively low frequencies (< 80 Hz) and small intensity modulation levels.
Intentional light variations are applied for warning, signalling (e.g. traffic-light signalling, flashing aviation light signals), entertainment (like stage lighting) with the purpose that flicker is perceived by people. Generally, the light output of lighting equipment may also have residual unintentional light level modulations due to the ...
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.
The lights are the inspiration for the bluegrass song “Brown Mountain Lights,” by Scotty Wiseman, later performed by The Hillmen (Vern Gosdin – vocals) and also The Kingston Trio and the Country Gentlemen. In this version, the light is being carried by "a faithful old slave/come back from the grave" who is searching for his lost master. [7]
Solutions include deploying the lighting over a full 3-phase supply, or by using high-frequency controllers that drive the lights at safer frequencies. [15] Traditional incandescent light bulbs, which employ filaments that glow continuously with only a minor modulation, offer another option as well, albeit at the expense of increased power ...
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