Flicker Visibility With Different Spectra of White Light

Flicker Visibility With Different Spectra of White Light

WoS Article

The standard flickermeter (voltage flickermeter) algorithm commonly used for the evaluation of flicker severity in current electromagnetic compatibility standards originates from the 1980s. It was developed to mimic irritation of an average human observer by flickering incandescent lamp as a reference light source and optimized to voltage fluctuations caused by arc furnaces. However, the algorithm is questionable as the situation in the grid changed since the 1980s; many modern devices are being connected to the grid, creating voltage distortion patterns which are not properly recognized by the voltage flickermeter. In addition, incandescent lamps have been largely replaced by discharge lamps and later by LEDs. Transitioning the algorithm from incandescent lamp light to LED light requires detailed revision of every part of the algorithm. This paper is concerned with verifying the frequency weighting function of the average human observer which is one of the bases of the voltage flickermeter, as well as of the derived light flickermeter. Flicker sensitivity of 34 human observers is measured with two different light sources (LED warm and neutral white, incandescent lamp) and compared with the frequency weighting function used in the current specification of the flickermeters in standards. Finally, an optimization of the weighting function is proposed based on the findings.

The standard flickermeter (voltage flickermeter) algorithm commonly used for the evaluation of flicker severity in current electromagnetic compatibility standards originates from the 1980s. It was developed to mimic irritation of an average human observer by flickering incandescent lamp as a reference light source and optimized to voltage fluctuations caused by arc furnaces. However, the algorithm is questionable as the situation in the grid changed since the 1980s; many modern devices are being connected to the grid, creating voltage distortion patterns which are not properly recognized by the voltage flickermeter. In addition, incandescent lamps have been largely replaced by discharge lamps and later by LEDs. Transitioning the algorithm from incandescent lamp light to LED light requires detailed revision of every part of the algorithm. This paper is concerned with verifying the frequency weighting function of the average human observer which is one of the bases of the voltage flickermeter, as well as of the derived light flickermeter. Flicker sensitivity of 34 human observers is measured with two different light sources (LED warm and neutral white, incandescent lamp) and compared with the frequency weighting function used in the current specification of the flickermeters in standards. Finally, an optimization of the weighting function is proposed based on the findings.

Fluctuations; Light emitting diodes; Observers; Frequency measurement; Voltage fluctuations; Frequency modulation; Low-pass filters; Standards; Filtering theory; Weight measurement; Flickermeter; LED spectrum; QUEST; temporal contrast sensitivity function; visible flicker

Fluctuations; Light emitting diodes; Observers; Frequency measurement; Voltage fluctuations; Frequency modulation; Low-pass filters; Standards; Filtering theory; Weight measurement; Flickermeter; LED spectrum; QUEST; temporal contrast sensitivity function; visible flicker

KUKAČKA, L.; HERGESEL, J.; NEČÁSEK, J.; BÍLEK, P.; VIK, M.; STIEGLER, R.; POURARAB, M.; MEYER, J.; DRÁPELA, J.

03.03.2025

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

PISCATAWAY

1939-9367

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS

61

4

United States of America

6062

6071

10

https://ieeexplore.ieee.org/document/10909263