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- Patterns
- Pattern 1: Floor Plate Geometry
- Pattern 2: Window Area
- Pattern 3: Section Depth
- Pattern 4: Work Station Partitions
- Pattern 5: Glass Area Ratios
- Pattern 6: Courtyard Depth and Width
- Pattern 7: Blinds and Shades (South Sun Penetration)
- Pattern 8: Blinds and Shades (Blind Types)
- Pattern 9: Toplighting (Gymnasium)
- Pattern 10: Toplighting (Warehouse)
- Pattern 11: Toplighting (Classroom)
- Pattern 12: Atrium and Adjacent Floorplate (Atrium Fenestration)
- Pattern 13: Atrium and Adjacent Floorplate (Atrium Size)
- Pattern 14: Daylight from Top and Side (Small Building)
- Pattern 15: Daylight from Top and Side (Office Building)
- Pattern 16: Daylight from Top and Side (Classroom)
- Pattern 17: Space Programming for Daylight, Sunlight and Variability
- Pattern 18: Fixed Building Shading (Fixed Classroom Shading)
- Pattern 19: Fixed Building Shading (Building Orientation)
- Using this Guide
- About
- DPG+E Development
LUX: Overcast Sky
These graphs represent raw illumination data measured at the horizontal workplane. Illumination is the most common measure of light and is defined in lay terms as the amount of light falling on a surface. On an overcast day in North America, outdoor illumination values can range from 1,000-30,000 lux (100-3,000 footcandles) depending on time of day, time of year, and location. Electric lighting criteria are almost exclusively defined in terms of illuminance. Common space types such as classrooms and offices have workplane illumination requirements that range from 200-500 lux (20-50 footcandles). These graphs are shown with 300 lux highlighted using a red dashed line. Not surprisingly, the same spaces perform very differently under overcast skies compared to sunny skies.
