High-quality daylighting for commercial buildings represents a major opportunity for energy efficiency as well as for attractive, functional design. In this paper, the authors examine the current state of the practice of daylighting design based upon research conducted by Pacific Gas and Electric Company. Three levels of practice reflect the degree to which practitioners emphasize daylighting in projects, the degree to which designers understand and incorporate daylighting design measures, and the degree to which designers employ predictive methods (including physical and computer modeling) to assess and refine their designs. The authors examine specific differences between high-level daylighting practitioners and the others, discussing the differences in terms of barriers to high-level practice.
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