Surge in technology for solar and other alternative energy forms over past 10 years led to revision and reinstatement of ASTM E903, Test Method for Solar Absorptance, Reflectance, and Transmittance of Materials Using Integrating Spheres. According to ASTM's Daryl Myers, "The increasing interest in this technology has been accompanied by a need to measure and report the optical properties of materials as weighted by various example or reference solar spectral distributions."
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