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Green goo oozing from electrical sockets and flickering lights might not be a sign your house is haunted this Halloween - but rather a call is needed for an electrician, according to a campaign group.
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.
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.
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.
An occulting light is a rhythmic light in which the duration of light in each period is longer than the total duration of darkness. In other words, it is the opposite to a flashing light where the total duration of darkness is longer than the duration of light. It has the appearance of flashing off, rather than flashing on.
The quality of the video clip you are watching depends on the following two factors: The speed of your internet connection; The bit rate (speed) of the video clip; The faster the bit rate of video clips, the better the quality of the video; however, the speed of your internet connection may limit the bit rate of the video clip.
The first historical record of the Marfa lights was in 1883 when a young cowhand, Robert Reed Ellison, saw a flickering light while he was driving cattle through Paisano Pass and wondered if it was the campfire of the Apache. Other settlers told him they often saw the lights, but that when they investigated they found no ashes or other evidence ...
A flashing sign is a sign that contains a sequential flashing light source where the period of time of illumination is equal to the period of non-illumination, and is used solely to attract attention in a non-informative way.