The effect of correlated color temperature (CCT) variation on spectral mismatch factor (SMF) for incandescent luminous flux lamps
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Author |
Manal A. Haridy
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e-ISSN |
1819-6608 |
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On Pages
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1112-1124
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Volume No. |
19
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Issue No. |
17
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Issue Date |
December 10, 2024
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DOI |
https://doi.org/10.59018/092441
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Keywords |
correlated color temperature (CCT), the spectral mismatch correction factor (SMF), Incandescent lamps, uncertainty analysis.
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Abstract
This work employed an experimental setup, consisting of an NIS Spectroradiometer from Ocean Optics HR 2000 with a measurement uncertainty of 4.7%, a photometric bench, and a series of NIS total luminous flux standard lamps previously calibrated at the National Physical Laboratory in England with an uncertainty of 0.8%. The following setup allowed the measurement of the correlated color temperature and spectral power distribution for six incandescent lamps. The most important basis for assessing the uncertainty and variations that occur in the spectral mismatch correction factor for each of the lamps is the CCT curves and their formula. Uncertainty calculations were therefore done to further investigate the lamp behavior and it was found that the CCT for the standard lamps must be in the interval starting from 2400 K up to 2750 K. For the tested lamps, CCT must lie between 2043 K and 2095 K. This spread in CCT highly affects the uncertainty of SMF. A very intensive analysis of the data led to an uncertainty model that followed the measurement results. The developed model was important in estimating the uncertainties associated with the SMF, which was about 0.0011 to 0.0084, depending on the CCT of the lamps. The correlation between CCT and SMF shows the importance of accurate calibration and good uncertainty modeling in photometric measurements.
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