Building Systems for Interior Designers（Part6）Lighting.pdfVIP

P a r t VI LIGHTING C h a p t e r 33 Daylighting Until recently, the workday ended when the sun went building. In the last decade, daylighting has been linked down. At the end of the day, everyone huddled around to increased productivity. The promise of even a mod- the fire, and then headed off to bed in the dark. Fires, est 1 percent increase in productivity is likely to appeal candles, and oil lamps provided weak illumination, and to a business owner more than a building that is 20 per- were often too expensive for poorer people. People de- cent more energy efficient. The potential for a good day- pended on daylight entering their buildings to give lighting design to improve productivity, even by a small enough light for daily tasks. Architects and builders un- increment, and thus to increase corporate profits, is a derstood the role of natural light in buildings intuitively. strong justification for a daylighting design. Building orientations, configurations, and interior fin- ishes were selected to provide sufficient levels of day- lighting in interior spaces. When energy is cheap, it is tempting to eliminate PHYSIOLOGICAL EFFECTS the variations inherent in daylight and supply all inte- OF DAYLIGHTING rior lighting with electric lighting supplemented by a few windows. Although daylighting offers significant In proper amounts, ultraviolet (UV) rays from the sun opportunities for energy conservation, the budget for help our bodies produce vitamin D and keep the skin lighting operation and maintenance represents only a health