ASTM-E971 › Standard Practice for Calculation of Photometric Transmittance and Reflectance of Materials to Solar Radiation
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1.1 This practice describes the calculation of luminous (photometric) transmittance and reflectance of materials from spectral radiant transmittance and reflectance data obtained from Test Method E903.
1.2 Determination of luminous transmittance by this practice is preferred over measurement of photometric transmittance by methods using the sun as a source and a photometer as detector except for transmitting sheet materials that are inhomogeneous, patterned, or corrugated.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
clerestories; fenestration; glazing materials; photometric reflectance; photometric transmittance; skylights; solar radiation; windows: Fenestration systems; Glazed apertures; Insulating specimens; Luminous (photometric) transmittance/reflectance; Reflectance and reflectivity--solar devices; Solar energy; Solar spectral irradiance; Spectral data--solar devices; Transmittance and reflectance--solar devices; Windows/window assemblies; ICS Number Code 27.160 (Solar energy engineering)
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Oct. 1, 2011