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Maximize the use of natural light to illuminate building interiors and to minimize the use of electrical lighting, program permitting.

High performance glazing, integrated shading devices to protect from direct sunlight and to mitigate glare. Atria, sky lights, light wells, clerestory windows, light reflectors (heliostats), day lighting controls and light deflectors (light shelves). Narrow floor plates.

Strategic analysis of geographic location and solar orientation, cloud coverage, ceiling height, distance away from source of daylight. Use of physical or computer model to run daylight simulation. Careful evaluation of glazing options to maximize the Visible Light Transmittance (Tvis) and minimize the Solar Heat Gain Coefficient (SHGC). The University of Washington's Integrated Design Lab (IDL) can provide some free assistance and will analyze a physical model.

Lighting energy use can be cut by 75 to 80 percent; many commercial buildings can reduce total energy costs by one-third. Increased building value and leasability.

Improved health, higher performance, less absenteeism.

Use high-performance glazing and verify energy code requirements. Diffused light from overcast skies can sometimes provide better natural lighting. Daylighting is most challenging in sunny climates due to the amount of sunlight, and shading controls required to mitigate glare.

1.1.3 Building Orientation
1.1.4 Skin to core distance
1.3.2 Daylight controls
1.4.1 Solar heat gain coefficient
1.4.2 Visible light transmittance
1.4.3 U-Value & R-Value
1.4.4-1.4.6 Solar Shading
5.1.3 Daylight Modeling