why a moving L.E.D. looks as it does
The flicker fusion threshold is a concept in the psychophysics of vision.
It is defined as the frequency at which an intermittent light stimulus appears to be completely steady to the observer. Flicker fusion threshold is related to persistence of vision. Although flicker can be detected for many waveforms representing time-variant fluctuations of intensity, it is conventionally, and most easily, studied in terms of sinusoidal modulation of intensity.
Pulse width modulation with regards to LEDs means that the LEDs will be pulsed or strobed at a rate so fast that the eye will see the light as being constantly on. In fact it is not.
This pulsing or turning the LEDs on and off lowers the potential heat stress on the chemical that makes the light, thus allowing the LEDs to perform longer than anticipated.
Artist/Author: Tedd StRain March 23, 2026 |
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