“…Both the RMSD and the MBD values are recorded in Table 5 and, as can be appreciated, are comparable to those obtained for horizontal diffuse illuminance. It can, therefore, be concluded from this study that the use of the sky-scanner measurements, to determine the diffuse illuminance on any horizontal or tilted surface, had an intrinsic RMSD due, mainly, to the technical specifications of the experimental device, near 30%, agreeing with other works [11]. As has been previously stated, when CIE standard classification is available, the sky luminance distribution can be obtained from Equation (11), and Equations ( 7)-( 10) can be applied to calculate L dh , L dv and, therefore, VSC.…”