How are voltage fluctuations related to light flicker?
Currently, the basic parameters that determine voltage fluctuations are short-term flicker severity, called the PST index, and long-term flicker severity, called the PLT index. (See sidebar “Flicker Levels and International Standards” on page 32.) These parameters refer to voltage fluctuation effects on lighting and their influence on humans.
Is there a problem with flickering light sources?
The phenomenon of flickering in light sources has been an issue since the beginning of power distribution systems. However, with the increase in number of customers and installed power, the problem of flicker has grown rapidly.
Why is flicker important in a production facility?
In a production facility with many moving pieces of machinery, low flicker is an essential condition to avoid a misperception of moving parts. According to the different kinds of environments and light needs, the lighting industry has developed dimmable products to help save energy.
What is the difference between flicker percent and flicker index?
To describe the variation within a cycle, there are two primary measures: flicker percent and flicker index. Flicker percent is the measure of the maximum light vs. the minimum light in a cycle. This only accounts for the minimum and maximum light outputs, and does not differentiate between waveforms.
What does it mean when a power line flickers?
Power-line flicker. Power-line flicker is a visible change in brightness of a lamp due to rapid fluctuations in the voltage of the power supply.
What are the effects of flicker on electronics?
These fluctuations in time generate flicker. The effects can range from disturbance to epileptic attacks of photosensitive persons. Flicker may also affect sensitive electronic equipment such as television receivers or industrial processes relying on constant electrical power.
How is flicker noise related to current level?
Since flicker noise is related to the level of DC, if the current is kept low, thermal noise will be the predominant effect in the resistor, and the type of resistor used may not affect noise levels, depending on the frequency window.
The phenomenon of flickering in light sources has been an issue since the beginning of power distribution systems. However, with the increase in number of customers and installed power, the problem of flicker has grown rapidly.