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A building complies with this section where its total connected interior lighting power calculated under Section C405.3.1 is not greater than the interior lighting power allowance calculated under Section C405.3.2.
C405.3.1 Total Connected Interior Lighting Power
The total connected interior lighting power shall be determined in accordance with Equation 4-10.

TCLP = [LVL + BLL + LED + TRK + Other] (Equation 4-10)
where:
TCLP = Total connected lighting power (watts).
LVL = For luminaires with lamps connected directly to building power, such as line voltage lamps, the rated wattage of the lamp.
BLL = For luminaires incorporating a ballast or transformer, the rated input wattage of the ballast or transformer when operating that lamp.
LED = For light-emitting diode luminaires with either integral or remote drivers, the rated wattage of the luminaire.
TRK = For lighting track, cable conductor, rail conductor, and plug-in busway systems that allow the addition and relocation of luminaires without rewiring, the wattage shall be one of the following:
  1. The specified wattage of the luminaires, but not less than 8 W per linear foot (25 W/lin m).
  2. The wattage limit of the permanent current-limiting devices protecting the system.
  3. The wattage limit of the transformer supplying the system.
Other = The wattage of all other luminaires and lighting sources not covered previously and associated with interior lighting verified by data supplied by the manufacturer or other approved sources.

The connected power associated with the following lighting equipment and applications is not included in calculating total connected lighting power.
  1. Television broadcast lighting for playing areas in sports arenas.
  2. Emergency lighting automatically off during normal building operation.
  3. Lighting in spaces specifically designed for use by occupants with special lighting needs, including those with visual impairment and other medical and age-related issues.
  4. Casino gaming areas.
  5. Mirror lighting in dressing rooms.
  6. Task lighting for medical and dental purposes that is in addition to general lighting and controlled by an independent control device.
  7. Display lighting for exhibits in galleries, museums and monuments that is in addition to general lighting and controlled by an independent control device.
  8. Lighting for theatrical purposes, including performance, stage, film production and video production.
  9. Lighting for photographic processes.
  10. Lighting integral to equipment or instrumentation and installed by the manufacturer.
  11. Task lighting for plant growth or maintenance.
  12. Advertising signage or directional signage.
  13. Lighting for food warming.
  14. Lighting equipment that is for sale.
  15. Lighting demonstration equipment in lighting education facilities.
  16. Lighting approved because of safety considerations.
  17. Lighting in retail display windows, provided that the display area is enclosed by ceiling-height partitions.
  18. Furniture-mounted supplemental task lighting that is controlled by automatic shutoff.
  19. Exit signs.
C405.3.2 Interior Lighting Power Allowance
The total interior lighting power allowance (watts) is determined according to Table C405.3.2(1) using the Building Area Method, or Table C405.3.2(2) using the Space-by-Space Method, for all areas of the building covered in this permit.

TABLE C405.3.2(1)
INTERIOR LIGHTING POWER ALLOWANCES: BUILDING AREA METHOD
BUILDING AREA TYPE LPD (w/ft2)
Automotive facility 0.71
Convention center 0.76
Courthouse 0.90
Dining: bar lounge/leisure 0.90
Dining: cafeteria/fast food 0.79
Dining: family 0.78
Dormitorya, b 0.61
Exercise center 0.65
Fire stationa 0.53
Gymnasium 0.68
Health care clinic 0.82
Hospitala 1.05
Hotel/Motela, b 0.75
Library 0.78
Manufacturing facility 0.90
Motion picture theater 0.83
Multifamilyc 0.68
Museum 1.06
Office 0.79
Parking garage 0.15
Penitentiary 0.75
Performing arts theater 1.18
Police station 0.80
Post office 0.67
Religious building 0.94
Retail 1.06
School/university 0.81
Sports arena 0.87
Town hall 0.80
Transportation 0.61
Warehouse 0.48
Workshop 0.90
  1. Where sleeping units are excluded from lighting power calculations by application of Section R404.1, neither the area of the sleeping units nor the wattage of lighting in the sleeping units is counted.
  2. Where dwelling units are excluded from lighting power calculations by application of Section R404.1, neither the area of the dwelling units nor the wattage of lighting in the dwelling units is counted.
  3. Dwelling units are excluded. Neither the area of the dwelling units nor the wattage of lighting in the dwelling units is counted.
TABLE C405.3.2(2)
INTERIOR LIGHTING POWER ALLOWANCES: SPACE-BY-SPACE METHOD
COMMON SPACE TYPESa LPD (watts/sq.ft)
Atrium
Less than 40 feet in height
0.03 per foot
in total height
Greater than 40 feet in height
0.40 + 0.02 per foot
in total height
Audience seating area
In an auditorium
0.63
In a convention center
0.82
In a gymnasium
0.65
In a motion picture theater
1.14
In a penitentiary
0.28
In a performing arts theater
2.03
In a religious building
1.53
In a sports arena
0.43
Otherwise
0.43
Banking activity area 0.86
Breakroom (See Lounge/breakroom)
Classroom/lecture hall/training room
In a penitentiary
1.34
Otherwise
0.96
Computer room 1.33
Conference/meeting/multipurpose room 1.07
Copy/print room 0.56
Corridor
In a facility for the visually impaired (and not used primarily by the staff)b
0.92
In a hospital
0.92
In a manufacturing facility
0.29
Otherwise
0.66
Courtroom 1.39
Dining area
In bar/lounge or leisure dining
0.93
In cafeteria or fast food dining
0.63
In a facility for the visually impaired (and not used primarily by the staff)b
2.00
In family dining
0.71
In a penitentiary
0.96
Otherwise
0.63
Electrical/mechanical room 0.43
Emergency vehicle garage 0.41
Food preparation area 1.06
Guestroomc, d 0.77
Laboratory
In or as a classroom
1.20
Otherwise
1.45
Laundry/washing area 0.43
Loading dock, interior 0.58
Lobby
For an elevator
0.68
In a facility for the visually impaired (and not used primarily by the staff)b
2.03
In a hotel
1.06
In a motion picture theater
0.45
In a performing arts theater
1.70
Otherwise
1.0
Locker room 0.48
Lounge/breakroom
In a healthcare facility
0.78
Otherwise
0.62
Office
Enclosed
0.93
Open plan
0.81
Parking area, interior 0.14
Pharmacy area 1.34
Restroom
In a facility for the visually impaired (and not used primarily by the staff)b
0.96
Otherwise
0.85
Sales area 1.22
Seating area, general 0.42
Stairway (see Space containing stairway)
Stairwell 0.58
Storage room 0.46
Vehicular maintenance area 0.56
Workshop 1.14
BUILDING TYPE SPECIFIC SPACE TYPESa LPD (watts/sq.ft)
Automotive (see Vehicular maintenance area)
Convention Center—exhibit space 0.88
Dormitory—living quartersc, d 0.54
Facility for the visually impairedb
In a chapel (and not used primarily by the staff)
1.06
In a recreation room (and not used primarily by the staff)
1.80
Fire Station—sleeping quartersc 0.20
Gymnasium/fitness center
In an exercise area
0.50
In a playing area
0.82
Healthcare facility
In an exam/treatment room
1.68
In an imaging room
1.06
In a medical supply room
0.54
In a nursery
1.00
In a nurse's station
0.81
In an operating room
2.17
In a patient roomc
0.62
In a physical therapy room
0.84
In a recovery room
1.03
Library
In a reading area
0.82
In the stacks
1.20
Manufacturing facility
In a detailed manufacturing area
0.93
0.65
In an extra-high-bay area (greater than 50' floor-to-ceiling height)
1.05
In a high-bay area (25-50' floor-to-ceiling height)
0.75
In a low-bay area (less than 25' floor-to-ceiling height)
0.96
Museum
In a general exhibition area
1.05
In a restoration room
0.85
Performing arts theater—dressing room 0.36
Post office—sorting area 0.68
Religious buildings
In a fellowship hall
0.55
In a worship/pulpit/choir area
1.53
Retail facilities
In a dressing/fitting room
0.50
In a mall concourse
0.90
Sports arena—playing area
For a Class I facilitye
2.47
For a Class II facilityf
1.96
For a Class III facilityg
1.70
For a Class IV facilityh
1.13
Transportation facility
In a baggage/carousel area
0.45
In an airport concourse
0.31
At a terminal ticket counter
0.62
Warehouse—storage area
For medium to bulky, palletized items
0.35
For smaller, hand-carried items
0.69
  1. In cases where both a common space type and a building area specific space type are listed, the building area specific space type shall apply
  2. A 'Facility for the Visually Impaired' is a facility that is licensed or will be licensed by local or state authorities for senior long-term care, adult daycare, senior support or people with special visual needs.
  3. Where sleeping units are excluded from lighting power calculations by application of Section R404.1, neither the area of the sleeping units nor the wattage of lighting in the sleeping units is counted.
  4. Where dwelling units are excluded from lighting power calculations by application of Section R404.1, neither the area of the dwelling units nor the wattage of lighting in the dwelling units is counted.
  5. Class I facilities consist of professional facilities; and semiprofessional, collegiate, or club facilities with seating for 5,000 or more spectators.
  6. Class II facilities consist of collegiate and semiprofessional facilities with seating for fewer than 5,000 spectators; club facilities with seating for between 2,000 and 5,000 spectators; and amateur league and high-school facilities with seating for more than 2,000 spectators.
  7. Class III facilities consist of club, amateur league and high-school facilities with seating for 2,000 or fewer spectators.
  8. Class IV facilities consist of elementary school and recreational facilities; and amateur league and high-school facilities without provision for spectators.
C405.3.2.1 Building Area Method
For the Building Area Method, the interior lighting power allowance is the floor area for each building area type listed in Table C405.3.2(1) times the value from Table C405.3.2(1) for that area. For the purposes of this method, an "area" shall be defined as all contiguous spaces that accommodate or are associated with a single building area type, as listed in Table C405.3.2(1). Where this method is used to calculate the total interior lighting power for an entire building, each building area type shall be treated as a separate area.
C405.3.2.2 Space-by-Space Method
For the Space-by-Space Method, the interior lighting power allowance is determined by multiplying the floor area of each space times the value for the space type in Table C405.3.2(2) that most closely represents the proposed use of the space, and then summing the lighting power allowances for all spaces. Tradeoffs among spaces are permitted.
C405.3.2.2.1 Additional Interior Lighting Power
Where using the Space-by-Space Method, an increase in the interior lighting power allowance is permitted for specific lighting functions. Additional power shall be permitted only where the specified lighting is installed and automatically controlled separately from the general lighting, to be turned off during nonbusiness hours. This additional power shall be used only for the specified luminaires and shall not be used for any other purpose. An increase in the interior lighting power allowance is permitted in the following cases:
  1. For lighting equipment to be installed in sales areas specifically to highlight merchandise, the additional lighting power shall be determined in accordance with Equation 4-11.
    Additional interior lighting power allowance = 1000 W + (Retail Area 1 × 0.45 W/ft2) + (Retail Area 2 × 0.45W/ft2) + (Retail Area 3 × 1.05 W/ft2) + (Retail Area 4 × 1.87 W/ft2)

    For SI units:

    Additional interior lighting power allowance = 1000 W + (Retail Area 1 × 4.8 W/m2) + (Retail Area 2 × 4.84 W/m2) + (Retail Area 3 × 11 W/m2) + (Retail Area 4 × 20 W/m2) (Equation 4-11)

    where:
    Retail Area 1 = The floor area for all products not listed in Retail Area 2, 3 or 4.
    Retail Area 2 = The floor area used for the sale of vehicles, sporting goods and small electronics.
    Retail Area 3 = The floor area used for the sale of furniture, clothing, cosmetics and artwork.
    Retail Area 4 = The floor area used for the sale of jewelry, crystal and china.
    Exception: Other merchandise categories are permitted to be included in Retail Areas 2 through 4, provided that justification documenting the need for additional lighting power based on visual inspection, contrast, or other critical display is approved by the code official.
  2. For spaces in which lighting is specified to be installed in addition to the general lighting for the purpose of decorative appearance or for highlighting art or exhibits, provided that the additional lighting power shall be not more than 0.9 W/ft2 (9.7 W/m2) in lobbies and not more than 0.75 W/ft2 (8.1 W/m2) in other spaces.

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