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Table C405.4.2(2)Interior lighting power allowancesSpace-by-space method.

Table C405.4.2(2)
Interior Lighting Power AllowancesSpace-by-Space Method
Common Space-by-Space Typesa
LPD (w/ft2)
Atrium - Less than 20 feet in height
0.39
Atrium - 20 to 40 feet in height
0.48
Atrium - Above 40 feet in height
0.60
Audience/seating area - Permanent
 
 
In an auditorium
0.61
 
In a gymnasium
0.23
 
In a motion picture theater
0.27
 
In a penitentiary
0.67
 
In a performing arts theater
1.16
 
In a religious building
0.72
 
In a sports arena
0.33
 
Otherwise
0.23
Banking activity arean
0.61
Breakroom (see lounge/breakroom)
 
Classroom/lecture hall/training room
 
 
In a penitentiary
0.89
 
Otherwise
0.71m
Computer room, data center
0.94
Conference/meeting/multipurpose
0.97
Confinement cell
0.70
Copy/print room
0.31
Corridor
 
 
In a facility for the visually impaired (and not used primarily by the staff)b
0.71
 
In a hospital
0.71
 
In a manufacturing facility
0.41
 
Otherwisec
0.41
Courtroomc
1.20
Dining area
 
 
In a penitentiary
0.42
 
In a facility for the visually impaired (and not used primarily by the staff)b
1.27
 
In a bar/lounge or leisure diningn
0.86
 
In cafeteria or fast food dining
0.40
 
In a family dining arean
0.60
 
Otherwise
0.43
Electrical/mechanical
0.43
Emergency vehicle garage
0.52
Food preparation
1.09
Guest rooma,b
0.41
Laboratory
 
 
In or as a classroom
1.11
 
Otherwise
1.33
Laundry/washing area
0.53
Loading dock, interior
0.88
Lobbyc
 
 
In a facility for the visually impaired (and not used primarily by the staff)b
1.69
 
For an elevator
0.65
 
In a hotel
0.51
 
In a motion picture theater
0.23
 
In a performing arts theater
1.25
 
Otherwise
0.84
Locker room
0.52
Lounge/breakroomn
 
 
In a health care facilityn
0.42
 
Otherwisen
0.59
Office
 
 
Enclosed ≤ 250
0.74
 
Enclosed ˃ 250
0.66
 
Open plan
0.61
Parking area, interior
0.15
Pharmacy area
1.66
Restroom
 
 
In a facility for the visually impaired (and not used primarily by the staff)b
1.26
 
Otherwisen
0.63
Sales area
1.05
Seating area, general
0.23
Stairway (see space containing stairway)
 
Stairwelln
0.49
Storage room
 
 
< 50 ft2
0.51
 
50-100 ft2
0.38
 
All other storage
0.38
Vehicular maintenance
0.60
Workshop
1.26
Building Specific Space-by-Space Typesa
LPD (w/ft2)
Automotive (see vehicular maintenance)
 
Convention center - Exhibit space
0.61
Dormitory living quartersa,b
0.50
Facility for the visually impairedb
 
 
In a chapel (and not used primarily by the staff)b
0.70
 
In a recreation room (and not used primarily by the staff)b
1.77
Fire stationsg
 
 
Sleeping quarters
0.23
Gymnasium/fitness center
 
 
In an exercise area
0.90
 
In a playing area
0.85
Health care facility
 
 
In an exam/treatment room
1.40
 
In an imaging room
0.94
 
In a medical supply room
0.62
 
In a nursery
0.92
 
In a nurse's station
1.17
 
In an operating room
2.26
 
In a patient roomg
0.68
 
In a physical therapy room
0.91
 
In a recovery room
1.25
Library
 
 
In a reading arean
0.31
 
In the stacks
1.10
Manufacturing facility
 
 
In a detailed manufacturing area
0.80
 
In an equipment room
0.76
 
In an extra high bay area (greater than 50-foot floor-to-ceiling height)
1.42
 
In a high bay area (25 - 50-foot floor-to-ceiling height)
1.24
 
In a low bay (< 25-foot floor-to-ceiling height)
0.86
Museum
 
 
In a general exhibition area
0.31
 
In a restoration room
1.10
Performing arts theater dressing/fitting room
0.41
Post office - Sorting area
0.76
Religious buildings
 
 
In a fellowship halln
0.54
 
In a worship/pulpit/choir arean
0.85
Retail facilities
 
 
In a dressing/fitting room
0.51
 
In a mall concourse
0.82
Sports arena - Playing area
 
 
For a Class 1 facilityi
2.94
 
For a Class 2 facilityj
2.01
 
For a Class 3 facilityk
1.30
 
For a Class 4 facilityl
0.86
Transportation
 
 
In a baggage/carousel area
0.39
 
In an airport concourse
0.25
 
At a terminal ticket countern
0.51
Warehouse - Storage area
 
 
For medium to bulky palletized items
0.33
 
For smaller, hand-carried items
 0.69
For SI: 1 foot = 304.8 mm, 1 watt per square foot = 11 W/m2.
a
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.
b
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.
c
For spaces in which lighting is specified to be installed in addition to, and controlled separately from, the general lighting for the purpose of highlighting art or exhibits, provided that the additional lighting power shall not exceed 0.5 W/ft2of such spaces.
d
Reserved.
e
Reserved.
f
Reserved.
g
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.
h
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.
i
Class I facilities consist of professional facilities; and semiprofessional, collegiate or club facilities with seating for 5,000 or more spectators.
j
Class II facilities consist of collegiate and semiprofessional facilities with seating for fewer than 5,000 spectators; club facilities with seating between 2,000 and 5,000 spectators; and amateur league and high school facilities with seating for more than 2,000 spectators.
k
Class III facilities consist of club, amateur league and high school facilities with seating for 2,000 or fewer spectators.
l
Class IV facilities consist of elementary school and recreational facilities; and amateur league and high school facilities without provisions for spectators.
m
For classrooms, additional lighting power allowance of 4.50 W/lineal foot of white or chalk boards for directional lighting dedicated to white or chalk boards.
n
Additional lighting power allowance of 0.30 W/ft2 for ornamental lighting. Qualifying ornamental lighting includes luminaires such as chandeliers, sconces, lanterns, neon and cold cathode, light emitting diodes, theatrical projectors, moving lights and light color panels when any of those lights are used in a decorative manner that does not serve as display lighting or general lighting.
o
For scientific laboratories, additional lighting power allowance of 0.35 W/ft2 for specialized task work - lighting that provides for small-scale, cognitive or fast performance visual tasks, lighting required for operating specialized equipment associated with pharmaceutical/laboratorial activities.
p
For offices, additional lighting power allowance of 0.20 W/ft2 for portable lighting, which includes under shelf or furniture-mounted supplemental task lighting qualifies when controlled by a time clock or an occupancy sensor.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405054, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405054, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405054, filed 2/1/13, effective 7/1/13.]
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