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Table 18. Single- and Multi-Family Illumination by Room Type

Bathroom

17.5

Hall, Stairway, Foyer

3.0

Bedroom

8.8

Kitchen, Breakfast Nook

22.5

Closet

5.0

Living Room, Great Room

8.8

Dining Room

5.0

Home Office, Den, Study

15.5

Family Room, Recreation Room

8.8

Utility Room

17.5

Garage

8.8

Other, Library

8.8

Unfinished Basement

5.0

Room Type

Lighting

Lighting

Requirements

Room Type

Requirements

(footcandles)

(footcandles)

Table 19. Multi-Family Common Space Illumination

Common Laundry

30

Common Office

30

Indoor Corridor

15

Workout Room

15

Equipment Room

30

Central Restroom

15

Multi-Purpose room

15

Area Type

Lighting Requirements (footcandles)

Source: IESNA Lighting Handbook, Security Lighting for People, Property & Spaces

The illumination at the horizontal plane can be determined by Equation 15. This calculation is required for all indoor spaces, and is automated in the BA analysis spreadsheet.

Equation 15:

Horizontal Illuminance (footcandles) =

(lumens/lamp) × NLa

× COU × LLF/(FFA of room)

NLa

=

number of lamps in the room

COU LLF FFA

= = =

coefficient of utilization (Table 20) light loss factor (0.8 for all fixture types) finished floor area of the room

where:

Default COUs for common fixture types are listed in Table 20 for rooms with a room cavity ratio of 0.5, ceiling reflectance of 80%, and wall reflectance of 50%. The BA Analysis Spreadsheet can be used to estimate COU for other room shapes.

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