Domed base sky. Courtesy of Bartenbach L'chtlabor.
Inside the mirror box artificial sky
Artificial sky types vary considerably in their purpose and construction. Many mimic the projected curvature of the sky dome itself by being hemispherical in form. Some also attempt to include the influence of the direct sun component. The newest computer controlled skies attempt to simulate various sky conditions including direct beam sunlight, particular cloud patterns, light color and quality and sky vault brightness distributions. These latter devices are highly calibrated and controlled scientific instruments that can even be used in basic research. Although the mirror box artificial sky is a compromise to that more ideal geometry, complexity and comprehensiveness, it is typically more economical to construct and maintain and is easier to accommodate within an indoor space. The mirror box does an economical and effective job of simulating overcast sky conditions for scale model testing to support building design decisions. This controlled condition testing is considered valuable to building designers as overcast sky conditions are often considered "worst case" conditions for a daylighting design.
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