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Verification of the NPL Standards of Relative Spectral Power Distribution by Filter Radiometry.

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    Area of Science:

    • Radiometry
    • Photometry
    • Spectroscopy

    Background:

    • Tungsten filament lamps are common light sources.
    • Accurate measurement of spectral power distribution and correlated color temperature is crucial for lighting applications.

    Purpose of the Study:

    • To measure the relative spectral power distribution (SPD) of visible radiation from a tungsten filament lamp.
    • To determine the correlated color temperature (CCT) of the lamp's radiation.
    • To develop a method independent of Planck's formula and the temperature scale.

    Main Methods:

    • Radiometric comparison using thermopiles with known spectral responsivity.
    • Utilizing a series of glass filters for different spectral bands.
    • Independent calibration against standard sources.

    Main Results:

    • The relative spectral power distribution of the tungsten lamp was accurately determined.
    • The correlated color temperature was precisely measured.
    • The method demonstrated independence from Planck's law and thermodynamic temperature scales.

    Conclusions:

    • The radiometric comparison method provides a reliable way to measure tungsten lamp SPD and CCT.
    • This technique offers an alternative to traditional methods based on Planck's formula.
    • The findings contribute to accurate characterization of light sources.