Using the example of the UV-excited Ca9KMg(PO4)7:1% Eu2+ phosphor, methods for characterizing the color quality of the light emitted by it at different operating temperatures are described. The effect of adopting two different colorimetric observers established by the International Commission on Illumination (i.e., the CIE 1931 observer with a viewing angle of two degrees and the CIE 2015 observer with a viewing angle of ten degrees) on the position of the chromaticity point of light emitted by phosphor is discussed. It was demonstrated that using the CIE 2015 photometric observer to determine the position of the chromaticity point, the tested phosphor is characterized by smaller changes in the color of emitted light as a function of operating temperature than when using the CIE 1931 observer. Full Text: PDF ReferencesR. Pązik et al., "Thermal quenching mechanisms of the Eu3+ luminescence in Ca9Al(PO4)7 obtained by citric route", Materials Research Bulletin, Vol. 48, I.2, 337 (2013). CrossRef I. Fryc, S. W. Brown, Y. Ohno, "A spectrally tunable LED sphere source enables accurate calibration of tristimulus colorimeters", Proc. SPIE Vol. 6158, 125 (2006) CrossRef Y. Ohno, "Practical Use and Calculation of CCT and Duv", LEUKOS, 10:1, 47-55, (2014). CrossRef D. Durmus, "Multi-objective optimization trade-offs for color rendition, energy efficiency, and circadian metrics", Proc. SPIE Vol. 11706, 117061J (2021) CrossRef I. Fryc, D. Czyzewski, " Dokładność pomiarowa spektroradiometrów typu CCD", Przeglad Elektrotechniczny R. 85(11), 276 (2009). DirectLink D. Czyzewski, "Zamienniki LED klasycznych żarówek", Przeglad Elektrotechniczny R. 88(11), 123 (2012). DirectLink J. Kusznier, W. Wojtkowski, "Spectral properties of smart LED lamps", Phot. Lett. Pol., 12(1), 16 (2020). CrossRef P. Hung, J. Y. Tsao, "Maximum White Luminous Efficacy of Radiation Versus Color Rendering Index and Color Temperature: Exact Results and a Useful Analytic Expression", Journ. of Display Techn., 9(6), 405 (2013). CrossRef Y. Asano, MD Fairchild, L. Blondé, "Individual Colorimetric Observer Model", PLOS ONE 11(2) e0145671 (2016). CrossRef Y. Wang, M. Wei, "Preference among light sources with different Duv but similar colour rendition: A pilot study", Lighting Res. & Tech., 50(7), 1013 (2018). CrossRef K. A. G. Smet, "Tutorial: The LuxPy Python Toolbox for Lighting and Color Science", LEUKOS, 16:3, 179 (2020). CrossRef D. Petrisor, C. D. Galatanu, C. Haba, L. Breniuc "Color Quality Measurements of LED Light Sources Using Image Processing", EEEIC/I&CPS Europe, 1, (2019) CrossRef ANSI C78.377:2017 DirectLink I. Fryc, T. Dimitrova-Grekow, "An Automated System for Evaluation of the Quality of Light Sources", 2016 IEEE (Lumen V4), 1 (2016). CrossRef Y. Ohno, "Spectral design considerations for white LED color rendering", Optical Engineering 44(11), 111302 (2005). CrossRef E. Purwanto, P. Dupuis, L. Canale, N. I. Sinisuka, G. Zissis, "Aging study of remote luminophore at ambient temperature", EEEIC/I&CPS Europe, 1 (2019). CrossRef J. Fan, Y. Li, I. Fryc, C. Qian, X. Fan, G. Zhang, "Machine-Learning Assisted Prediction of Spectral Power Distribution for Full-Spectrum White Light-Emitting Diode", IEEE Photonics Journal, 12(1), 1 (2020). CrossRef D. Mozyrska, M. Wyrwas, I. Fryc, "Wyznaczanie parametrów kolorymetrycznych LEDa w pełnym zakresie temperatur pracy", Przeglad Elektrotechniczny R. 93(4a), 232 (2012). CrossRef I. Fryc, "Analiza właściwości spektralnych LEDów z zależności od temperatury i natężenia ich prądu pracy", Przeglad Elektrotechniczny R. 86(10), 187 (2010). DirectLink I. Fryc, "Pomiary wybranych parametrów świetlno-optycznych LEDów według zaleceń Międzynarodowej Komisji Oświetleniowej CIE 127:2007", Przeglad Elektrotechniczny R. 85(11), 317 (2009). DirectLink A. David et al., "Development of the IES method for evaluating the color rendition of light sources", Opt. Express 23, 15888 (2015). CrossRef S Jost-Boissard, P Avouac, M Fontoynont, "Assessing the colour quality of LED sources: Naturalness, attractiveness, colourfulness and colour difference", Lighting Research & Technology, 47(7): 769 (2015). CrossRef J. Kowalska, "Określanie jakości oddawania barw źródeł światła parametrami przedstawionymi w zaleceniach IES TM-30-15 i CIE 013.3-1995", Przeglad Elektrotechniczny R. 93(6), 50 (2017). DirectLink J. Kowalska, I. Fryc, "Jakość oddawania barw współczesnych lamp fluorescencyjnych określona zdefiniowanym przez CIE wskaźnikiem wierności barwy oraz wskaźnikiem oddawania barw", Przeglad Elektrotechniczny R. 95(7), 94 (2019). DirectLink CIE 170-2:2015 DirectLink

No abstract

Fluorescent lamps (FLs) used for general lighting due to European Union legislation will be withdrawn from sale by 2023. The LEDs which are proposed as substitute of FL should provide the same quality of lighting and visual comfort. The research on substituting FL lamps is based on the multi-criteria parameterization. It is indicates that LEDs substituting the FLs may not meet the end user expectations due to the Color Preference Criteria. The paper compare typical FL (4100 K) lamp named by CIE as illuminant FL3.5 with its corresponding LED substitutes available on the market. The LED substitute selection criterion were value of Corelated Color Temperature (CCT) and chromaticity point which was must be within ellipse provided by ANSI C78.376 document for 4100 K CCT. Full Text: PDF ReferencesW. Żagan, Conditions necessary to replacing the conventional lamps by energy-saving lamps, Przeglad Elektrotechniczny, R. 85, 100 (2009). DirectLink M. Zalesinska, J. Zablocka, K. Wandachowicz, "Measurement and evaluation of selected parameters for non-directional household lamps", Prz. Elektrotech. 94, 188 (2018). CrossRef D. Czyżewski, "LED substitutes of conventional incandescent lamps", Prz. Elektrotech. 88, 123 (2012). DirectLink D. Czyżewski, "LED substitutes of conventional incandescent lamps(2)", Prz. Elektrotech. 91, 199 (2015). CrossRef Document of the International Commission on Illumination CIE 015:2018 "Colorimetry, 4th Edition". CrossRef CIE 13.3-1995: Method of measuring and specifying colour rendering properties of light sources," Commission Internationale de l'Eclairage, Vienna, Austria (1995). DirectLink Y. Ohno, M. Fein, C. Miller, "Vision Experiment on Chroma Saturation 2016 DOE SSL R&D Workshop 14 for Color Quality Preference", CIE 216 :2015, 60 (2015). DirectLink Y. Ohno, "Practical Use and Calculation of CCT and Duv", LEUKOS- J. Illum. Eng. Soc. N. Am. 10, 47, (2014). CrossRef Y. Wang, M. Wei, "Preference among light sources with different Duv but similar colour rendition: a pilot study", Ligh. Res. Technol. 50, 1013 (2018). CrossRef M. Royer, Analysis of color rendition specification criteria, Light-Emitting Devices, Materials, and Applications. 10940. International Society for Optics and Photonics, (2019). CrossRef ANSI/IES TM-30-20, IES Method for Evaluating Light Source Color Rendition. DirectLink J. Kowalska, "Analysis of parameters describing the quality of the color rendering of light sources according to the IES TM-30-15 and the CIE 013.3-1995", Prz. Elektrotech. 93, 50 (2017). CrossRef J. Kowalska, I.Fryc, "Colour rendition quality of typical fluorescent lamps determined by CIE Colour Fidelity Index and Colour Rendering Index", Prz. Elektrotech. 95, 94 (2019). CrossRef D. Aurelien, et al., "Development of the IES method for evaluating the color rendition of light sources", Opt. Express, 23, 15888 (2015). CrossRef W. Żagan, "Honestly and prudently about LED - Future and present state of LED application in lighting", Prz. Elektrotech. 84, 1 (2008). DirectLink W. Żagan, "Theoretical considerations on luminous efficacy and colour rendering of light sources", Prz. Elektrotech. 89, 284, (2013). DirectLink M. Listowski, "The real and modeled values of photometric and colorimetric parameters comparison of white LEDs operating at wide temperature range", Prz. Elektrotech. 98, 57 (2022). CrossRef R. Supronowicz, J. Fan, M. Listowski, A. Watras, I. Fryc, "Application of different metrics for describing light color quality of white LED". Photonics Lett. Pol. 13, 31 (2021). CrossRef I.Fryc, "Measurement techniques of optical LEDs properties performed with compliance conformity with CIE 127:2007 standard", Prz. Elektrotech. 85, 317 (2009). DirectLink I. Fryc, T. Dimitrova-Grekow, "An Automated System for Evaluation of the Quality of Light Sources" Proceedings of 2016 IEEE Lighting Conference of the Visegrad Countries (Lumen V4), CrossRef P. Jakubowski, J. Kowalska, R. Supronowicz, I. Fryc, "The Influence of Spectral Measurements Uncertainty of Fluorescent Lamps on Calculated Value of Their Relative Melanopic Weighted Irradiance and Colour Quality Parameters", 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4), 1 (2018). CrossRef P. Zhu, H. Zhu, G. C. Adhikari, S. Thapa, "Design of circadian white light-emitting diodes with tunable color temperature and nearly perfect color rendition", OSA Contin. 2, 2413 (2019). CrossRef Q. Dai, Y. Huang, L. Hao, Y. Lin, K. Chen, "Spatial and spectral illumination design for energy-efficient circadian lighting", Build. Environ. 146, 216 (2018). CrossRef A. Sánchez-Cano, J. Aporta, "Optimization of Lighting Projects Including Photopic and Circadian Criteria: A Simplified Action Protocol". Appl. Sci. 10, 8068 (2020). CrossRef CIE International Standard DIS 026/E:2018 CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light, CrossRef I. Fryc, P. Jakubowski, K. Kołacz, "Analysis of optical radiation parameters of compact discharge HID lamps and LED COB modules used for illuminating shop windows, Prz. Elektrotech. 93, 186 (2017). CrossRef I. Fryc, "LED's spectral power distribution under different condition of operating temperature and driving current", Prz. Elektrotech. 86, 187 (2010). DirectLink D. Mozyrska, M. Wyrwas, I.Fryc, "The determination of the LEDs colorimetric parameters, in the range of their operating temperature", Prz. Elektrotech. 88, 232 (2012). DirectLink M. Kreissl, T. Q. Tien, J. W. Tomm, "Spatially resolved and temperature dependent thermal tuning rates of high-power diode laser arrays", Appl. Phys. Lett. 88, 133510 (2006). CrossRef K. Wandachowicz, K. Domke, "Measurements of the temperature-dependent changes of the photometrical and electrical parameters of LEDs", Prz. Elektrotech. 84, 114 (2008). DirectLink I. Fryc, "The spectral power distribution of LED driven by square shape pulses", Prz. Elektrotech. 88, 131 (2012). DirectLink J. Fan, Y. Li, I. Fryc, C. Qian, X. Fan, G. Zhang, "Machine-learning assisted prediction of spectral power distribution for full-spectrum white light-emitting diode". IEEE Photonics J. 12, 1 (2019). CrossRef R. Supronowicz, I. Fryc, "The LED spectral power distribution modelled by different functions - how spectral matching quality affected computed LED color parameters", Proceedings of Balkan Light Junior 2019 conference (ss. 1-4), (2019). CrossRef A. Kokka, et al., "Development of white LED illuminants for colorimetry and recommendation of white LED reference spectrum for photometry", Metrologia 55, 526 (2018). CrossRef ANSI C78.376-2014 Electric Lamps - Specifications For The Chromaticity Of Fluorescent Lamps. DirectLink