LUMINANCE, RADIANCE, AND TEMPERATURE.
INSTITUTE FOR DEFENSE ANALYSES ARLINGTON VA RESEARCH AND ENGINEERING SUPPORT DIV
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There are two definitions of light. One concerns human vision and has a set of units and standards based upon psychophysical reactions. The other definition of light is that electromagnetic radiation in the broad spectral region where the principles of optics apply. There are no established standards for the concepts of radiance, irradiance and the related quantities under the second more general definition. This need has been recognized and one effective reference source has been proposed for serious consideration and related reference sources are under development. The appropriate units and reference standards are discussed in terms of present day practice and in terms of the accuracy and precision obtainable. The problem of the apparent discrepancy between the International Practical Temperature Scale and the Thermodynamic Kelvin Temperature Scale, to which the normal references in physics relate, is also discussed. Author