 Primarily a study in control  Source that does not consume electricity  Connects us with the natural world  Flavors of Daylight  Functional daylight – to serve task and spatial-defining functions - diffuse  Daylight Accenting – used to inspire certain moods and create visual interest -

 Direct Sunlight – least useful, most hazardous to design  Excessively bright, creates glare, and unacceptable contrast.  Heat and UV radiation is not controlled  Too Bright for our visual system  Skylight – sunlight diffusing and scattering through various states or our atmosphere  Varies according to time of day and year, weather and atmospheric conditions.  Suits our visual system for long durations  Diffused Sunlight – introducing sunlight after interaction with a diffusing material  Tinting or frosted material – more manageable light source.

 Height and width of forms and facades greatly affect the surface available for daylighting  Glazing (windows) must be considered.  Latitude – The closer to the north/south poles the lower the sun will be in the sky throughout the year.  Cardinal Orientation - rising East and setting West sun have higher potential for direct exposure.  Northern hemisphere – more south facing light  Southern hemisphere – more north facing light

 Side-light systems  Overhanging soffit(page 114)  Light Shelf (page 114)  Light monitor(page 115)  Clerestory window(page 115)  Vertical shading(page 115)  Top-light Systems  S kylight(page 116)  Bounced skylight(page 116)  Shielded skylight(page 117)

 Diffusing – translucent acrylic, frosted class  Creates a soft even texture like on a cloudy day.  Tinting – reducing transmittance of a transparent substrate  Mixed reviews, gloomy or dark perception to the outside  Fritting – transparent materials with lines etched or embedded in them.  Act like miniature louvers to reflect light at various angles  Daylight at work – accent feature

 Intensity – Control of electrical fixtures as daylight changes  Photocells – lower light levels or help shade when daylight is to bright  Photocells, dimmers and time clocks  Color – Do not try to match daylight for CRI  Shape – daylight is delivered in long clean pieces or planes, or pools if controlled with light tubes.

 Heat Gains - direct daylight gives heat build up – tinting or expensive glazing techniques can be used.  Glare and Contrast – Uncontrolled sunlight causes glare and intense contrast  Damage to Art, Fabric, and Other Materials – UV radiation and heat will damage dyes, inks, pigments, organic materials.  Excessive Window Light – understand the daylight received from picture windows.

Daylight is controllable and predictable.  Natural element to be used when used with proper controlling techniques such as draperies, curtains, blinds, etc.  Experiment with daylight design  Use Sunlight and electrical lighting together for a better design.