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2 2019

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Colour rendition quality of typical fluorescent lamps determined by CIE Colour Fidelity Index and Colour Rendering Index

Kowalska Justyna, Fryc Irena

Przegląd Elektrotechniczny

2019

R. 95, nr 7

94--97

This paper describes how CIE colour fidelity index Rf values are correlated with CIE Ra colour rendering index values for typical FL fluorescent lamps. The results shows that for broad band FL lamps Rf doesn’t introduce drastically changes in relation to Ra values. The other situation is with narrow band FL lamps whose spectral power distribution was designed for achieving of high Ra value. At that case there is no correlation between Ra and Rf.

W artykule przedstawiono badania nad zależnością wskaźnika wierności barwy CIE Rf od wskaźnika oddawania barw CIE Ra dla standardowych lamp fluorescencyjnych (świetlówek) FL. Wyniki pokazują, że dla szerokopasmowych świetlówek, wskaźnik Rf nie wprowadza drastycznych zmian w stosunku do wartości Ra. W przypadku wąskopasmowych lamp FL, tj. takich których rozkład widmowy został zaprojektowany w celu osiągnięcia wysokiej wartości Ra pomimo faktu iż wizualnie ich światło nie oddaje perfekcyjnie barw, wartość wskaźnika Rf nie koreluje z Ra.

The influence of different photometric observers on luxmeter accuracy for LEDs and FLs lamps measurements

Fryc Irena, Tabaka Przemyslaw

Optica Applicata

2019

Vol. 49, nr 2

345--354

Age-dependent changes in human eye spectral sensitivity play an important role in contemporary lighting research. Nowadays lighting designing practices take into account the fact that an illuminance level perceived by a given observer depends also on his age. According to recommendations of the International Commission on Illumination CIE presented in the document 227:2017, users age should be taken into account in lighting design of public buildings. The natural consequence of this approach in designing should be the fact that the age of a user also should be considered when verification of lighting installation photometric parameters is performed. According to recommendations of latest CIE documents, verifications of illuminance levels are performed by luxmeters whose spectral sensitivity matches the CIE standard photometric observer V(λ) function. At present there is a lack of papers describing how the accuracy of illuminance measurements could be affected by the fact that with age there are changes in human eye spectral sensitivity and it differs from V(λ) function. To fill this gap we present in this article results showing how applying of different photometric observers influence the luxmeter accuracy. The calculations were performed for LED and FL light sources measured by class B and class C luxmeters. These results indicate that a luxmeter error f1 strongly depends on correlated color temperature of a lamp under measurement and spectral sensitivity of applied photometric observer.