Net Zero Energy Buildings – Lighting & Daylighting

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Daylighting

Simulating Illuminance Levels

Glare From Daylighting

Light Shelves

Clerestories / High Windows

Skylights

Light Wells

Artificial Lighting

Lighting Efficiency (“Efficacy”)

Glare From Lighting

Task Lighting

Separating Task and Ambient Lighting

Recommended Illuminance Levels

ActivityRecommended Illumination

lux foot-candles

Parking lots / sidewalks at night 20 - 50 2 - 5

Warehouses, Theaters,Homes

150 15

Most office paperwork / computer work,Libraries,

Laboratories500 50

Supermarkets, Mechanical / electronic workshops

750 75

Drawing work, Detailed mechanical / electronics work,

Surgery1,000 100

Detailed drawingHighly detailed mechanical / electronics work

1,500 - 2,000 150 - 200

Very lengthy and precise visual tasks with low contrast 2,000 - 10,000 200 - 1,000

Controls for Visual Comfort

Controls for Thermal Comfort

Saving Lighting Energy

Saving Lighting Energy

Saving Cooling Energy

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