Knowledge - Tech Notes

Knowledge - Tech Notes

An undesired change in visual perception induced by a light stimulus whose luminance or spectral distribution fluctuates with time, for an observer in a certain environment. Read More
IndexDefined byDefinition PointFormulaIndex range
Percent FlickerIlluminating Engineering Society (IES)A relative measure of the cyclic variation in the amplitude of a light.Percent Flicker measurement0% ~ 100%
The lower the percent flicker, the less substantial the flicker.
Flicker IndexIlluminating Engineering Society (IES)A measure of the cyclic variation taking into account the shape of the waveform.Flicker Index measurement0 ~ 1
The lower the flicker index, the less substantial the flicker.
SVM (Stroboscopic Effect Visibility Measure)PHILIPS & CIETime domain → frequency domain.
Summation of weighted Fourier components
SVM measurementSVM < 1,Not Visible
SVM > 1,Visible
SVM = 1,Just Visible

Reference:
https://www.designlights.org/news-events/events/stakeholder-meeting-2016/presentation-downloads/temporal-light-artifacts-flicker-and-stroboscopic-effect/

http://www.yidianzixun.com/article/0EmpHcjR

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UPRtek Knowledge - Tech Notes Introduction

United Power Research Technology Corp. is Taiwan supplier and manufacturer in Optoelectronics Industry. UPRtek has been offering our customers high quality Spectrometer, Color Meter, Spectral PAR Meter, Spectral Color Meter, Spectrum, LED Meter, Spectradiometer, LED Measurement, LED light testing since 2010. With both advanced technology and 8 years experience, UPRtek always make sure to meet each customer's demand.


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