Strategies:
What is Daylighting Daylighting is the practice of bringing light into a building’s interior and distributing it in a way that provides more desirable and better-quality illumination than electric light sources. This reduces the need for electrical lighting energy, thus cutting down on electricity use and its associated costs and pollution.
Studies substantiate that daylighting creates healthier and more stimulating work environments than artificial lighting systems and can increase productivity up to 15 percent. Daylighting also provides changes in light intensity, color, and views that help support worker productivity. Surveys have shown that 90 percent of employees prefer to work in spaces with windows and a view to the outside. In one study, 75 percent of office and factory workers stated that daylight provides better quality illumination than artificial light. Daylighting significantly reduces energy consumption and operating costs.
Energy used for lighting in buildings can account for 40 to 50 percent of total energy consumption. In addition, the added space-cooling loads that result from waste heat generated by lights can amount to three to five percent of total energy use. Properly designed and implemented daylighting strategies can save 50 to 60 percent of lighting energy. Greater use of daylighting can also provide advantages for the environment by reducing power demand and the related pollution and waste byproducts from power production. Lighting—and additional building cooling requirements from lighting—use an estimated 20 to 30 percent of total United States energy production. About three-quarters of this amount is used to light commercial and industrial buildings. If extensive daylighting measures achieved only a 40 percent lighting energy savings, total national electricity consumption would be reduced by as much as nine percent. In addition, the greatest savings from daylighting occur during periods when sunlight is most intense, which coincides with periods of peak demand for heating, ventilating, and air-conditioning (HVAC) and refrigeration loads. Therefore, wider use of daylighting would reduce both the need for new peak demand capacity and overall power demand. Back to strategies | | 
A highly efficient reflective film called SOLF made by 3M, optimizes the effectiveness of these light shelves in the Library which bounce light up onto the sloped ceiling providing more even illumination in the space. They also reduce glare near the windows.
High clerestories in the library at "Mainstreet" provide glare free abundant light to the room below without the problems of direct light. The vertiacal surfaces bounce and diffuse the light.
Sloping the ceiling has the same effect as maintaining the higher level throughout the space with the added advantages of greater clearance above the ceiling for mechanical systems where it is needed and the ceiling is brighter than it would be if flat because it reflects incident horizontal light much better
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