Basics of Daylighting in a Green Environment
The use of natural sunlight, known as daylighting, to illuminate a building can save energy, reduce operating costs, create visual appeal, and enhance occupant health and productivity. The U.S. Green Building Council Leadership in Energy and Environmental Design (LEED™) rating system encourages the use of daylighting to achieve high performance buildings. This course provides an introduction to the use of daylighting in commercial spaces. The course objective is to show why daylighting should be considered, the basic guidelines of using daylighting and some words of caution when using certain daylighting techniques.

2.2 What Is 'Not-So-Good' Daylighting?

Daylighting should provide illumination without blinding or cooking the occupants. It must be controlled to keep from being a source of glare. It must be sized so as to provide sufficient illumination while keeping unnecessary heat gain to a minimum.

Eye adaptation must be considered. An occupant looking at a bright patch of daylight (direct or reflected) will need time to see at lower light levels.

Daylighting must be coordinated with the electric lighting using lighting controls. A great daylighting design will not help the energy bill if the electric lights are on when they are not needed. A recently constructed national airport had great daylighting elements as part of its design but the daylight controls were 'valued-engineered' out and so the lights burn all day eliminating any energy savings.

Overhead glazing provides daylighting Source: Benya Lighting Design

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