Flicker is defined as fluctuation or wavering in visible light intensity due to voltage variations. These variations in voltage are caused by fluctuations in the load through the system source impedance. Individuals perceive flicker differently depending on their sensitivity.
The challenge in flicker investigations is to quantify the problem, and then find the underlying source of the voltage variation - either loads with excessive current, or abnormally high impedance causing excessive voltage drop with normal loads.
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