How is the Light Reflectivity Value (LRV) measured? Why do building codes require a certain percentage of LRV in the materials used?
LRV is ill-defined, but the best metric appears to be the CIE Y tristimulus value (or the luminous reflectance). I am not familiar with the building codes, but I would suspect that it is an issue of energy conservation since lighter building materials would result in less energy required for achieving desired illumination levels and to cool the building interior.
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