ASSIST: Alliance for Solid-State Illumination Systems and Technologies
ASSIST recommends...Flicker
This series of ASSIST recommends provides recommendations for assessing flicker in lighting systems. Volume 1 outlines a preliminary calculation method for trading off frequency and percent flicker, based on recent data,
for estimating the detection and acceptability of indirect, stroboscopic flicker from SSL systems. Volume 2 provides
application considerations related to stroboscopic effects. Volume 3 is a recommended metric for evaluating direct flicker perception from lighting.
Volume 11, Issue 1:
Flicker Parameters for Reducing Stroboscopic Effects from Solid-state Lighting Systems  – May 2012
Volume 11, Issue 2: Application Considerations Related to Stroboscopic Effects from Light Source Flicker – October 2014, Revised September 2015 
Volume 11, Issue 3: Recommended Metric for Assessing the Direct Perception of Light Source Flicker – January 2015
Flicker Perception Metric Examples for Issue 3
To show the metric calculation procedure described in Issue 3, included here for download are several .txt file waveform examples that can be used with the sample Matlab code included in the appendices. The text files represent the recommended sampling rate and record length to accurately calculate the proposed perceived flicker metric.
Example .txt files and Matlab code for download: FlickerMetricExamples.zip
Volume 11, Issue 4: Evaluating Light Source Flicker for Stroboscopic Effects and General Acceptability – August 2017
Stroboscopic Flicker Calculation Example Downloads for Issue 4
Calculating CP Example Matlab code: Cp_16Aug2017.m
Calculating CP Ratio Example Matlab code: CpRatio_16Aug2017.m
ENERGY STAR® Flicker Testing Tutorial – September 22, 2017
Introduction to Flicker Concepts and Effects – Dr. John Bullough, LRC
Metrics for Evaluating Flicker – Andrew Bierman, LRC
Waveform Acquisition Basics – Andrew Bierman, LRC
Related News and Research
Minimizing Flicker from SSL Systems
Measurement procedure for quantifying perceptible light flicker proposed in LRC’s ASSIST recommends publication – LRC Press Release (2015)
Calculation methods for estimating detection and acceptance of LED light source flicker published in ASSIST recommends – LRC Press Release (2012)
Studies Published on Minimizing Flicker from SSL Systems; ASSIST to Release Related Recommendation – LRC Press Release (2011)
Project Summary Sheet: ASSIST recommends… Assessing Direct Perception of Flicker (2015) 
Project Summary Sheet: ASSIST recommends… Light Source Flicker: Application Considerations (2015)
Project Summary Sheet (2011)
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