| Summary: | 博士 === 國立台灣工業技術學院 === 電機工程技術研究所 === 85 === Light flicker is an important characteristic of the light
quality in addition tolight flux outputs for light sources. It
is evident that a stable voltage supplyproduces stable,
comfortable light quality for human vision. The flickerless
lightquality is the first concern for indoor reading purpose.
Indeed, varying voltage and flicker voltage produced by varying
load or sudden change load are the major sources of light
flicker effect. Research papers published so far had been
focused on discussing the flicker effect of varying voltage on
light sources without analyzing physical luminescence
characteristics and frequency-dependenceof light sources in
distribution power systems. The flicker voltage standard
orrestriction was organized through measuring the flicker
voltage and observing human feeling statistically without an
effective measuring and evaluating technique in numeric to build
a strong foundation for judging the light flicker quality of
light sources. The purpose of this research is to develop an
effective lighting flicker measuringalgorithm to evaluate light
flickers. First, the light flicker effect of indoor light
sources is discussed. Then a measuring and evaluation technique
is built according tohuman vision and documents published.
Various indoor light sources and ballastsequipped with
fluorescent lamps are tested in laboratory. Experiment results
clarifythe light flicker level among these light sources. An
useful evaluation index, flickerindex, is presented to
differentiate the flicker severity of the lighting devices and
fixtures. A portable prototype flicker meter is designed based
on the algorithm proposedin order to proceed field testing. Test
results show that this measuring techniqueis practical and
useful for comparing the flicker severity of light sources. The
flickermeter can be a helpful tool to identify ballasts of
fluorescent lamps, whether they areconventional EM ballast or
electronic ballast. In addition, the evaluation
techniqueproposed can be an useful aid in light source
development, ballast design and flicker voltage research in
distribution power systems.
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