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Lighting: Designing with Daylight. 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
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Lighting: Designing with Daylight • 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 -
Lighting:Components of Daylight (Textures) • 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.
Lighting: Site Layout and Massing • 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
Lighting:Daylight Systems • 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 • Skylight (page 116) • Bounced skylight (page 116) • Shielded skylight (page 117)
Lighting:Light Control Techniques • 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
Lighting:Integrating with Electric Light • 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.
Lighting:Hazards of Daylight • 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.
Lighting:Daylight as a Controllable Element 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.
