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ASHRAE 90.1-2004

Section: 9.6.1 - Space-By-Space Method

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 Requirements:

Use the following steps to determine the interior lighting power allowance by the space-by-space method:

  1. Determine the appropriate building type from Table 9.6.1. For building types not listed, selection of a reasonably equivalent type shall be permitted.
  2. For each space enclosed by partitions 80% or greater than ceiling height, determine the gross interior floor area by measuring to the center of the partition wall. Include the floor area of balconies or other projections. Retail spaces do not have to comply with the 80% partition height requirements.
  3. Determine the interior lighting power allowance by using the columns designated space-by-space method in Table 9.6.1. Multiply the floor area(s) of the space(s) times the allowed lighting power density for the space type that most closely represents the proposed use of the space(s). The product is the lighting power allowance for the space(s). For space types not listed, selection of a reasonable equivalent category shall be permitted.
  4. The interior lighting power allowance is the sum of lighting power allowances of all spaces. Trade-offs among spaces are permitted provided that the total installed interior lighting power does not exceed the interior lighting power allowance.
     

Exceptions:

See Section 9.6.2 - 'Additional Interior Lighting Power' for situations where additional lighting power is allowed.

 

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Table 9.6.1
Lighting Power Densities Using the Space-by-Space Method

Common Space Types1

 LPD (W/ft2)

Building Specific Space Types

 LPD (W/ft2)
Atrium-1st three floors 0.6 Automotive - Service/Repair 0.7
Atrium-each additional floor 0.2 Bank/Office - Banking Activity Area  
Audience/Seating Area 0.9 Convention Center - Exhibit Space 1.3
  For Convention Center 0.7 Courthouse/Police Station/Penitentiary  
  For Exercise Center 0.3   Courtroom 1.9
  For Gymnasium 0.4   Confinement Cells 0.9
  For Motion Picture Theater 1.2   Judges Chambers 1.3
  For Penitentiary 0.7 Dormitory - Living Quarters 1.1
  For Performing Arts Theater 2.6 Fire Stations  
  For Religious Buildings 1.7   Fire Station Engine Room 0.8
  For Sports Arena 0.4   Sleeping Quarters 0.3
  For Transportation 0.5 Gymnasium/Exercise Center  
Classroom/Lecture/Training 1.4   Playing Area 1.4
 

For Penitentiary

 1.3   Exercise Area 0.9
Conference/Meeting/Multipurpose 1.3 Hospital  
Corridor/Transition 0.5   Emergency 2.7
  For Hospital 1.0   Exam/Treatment 1.5
  For Manufacturing Facility 0.5   Laundry - Washing 0.6
Dining Area 0.9   Medical Supply 1.4
 

For Penitentiary

 1.3   Nursery 0.6
  For Hotel 1.3   Nurse Station 1.0
  For Motel 1.2   Operating Room 2.2
  For Bar Lounge/Leisure Dining 1.4   Patient Room 0.7
  For Family Dining 2.1   Pharmacy 1.2
Dressing/Locker/Fitting Room 0.6   Physical Therapy 0.9
Electrical/Mechanical 1.5   Radiology 0.4
Food Preparation 1.2   Recovery 0.8
Laboratory 1.4 Hotel/Motel Guest Rooms 1.1
Lobby 1.3 Library  
  For Hotel 1.1   Card File & Cataloguing 1.1
  For Performing Arts Theater 3.3   Reading Area 1.2
  For Motion Picture Theater 1.1   Stacks 1.7
Lounge/Recreation 1.2      
 

For Hospital

 0.8 Manufacturing  
Office-Enclosed 1.1   Low Bay (<25' floor-to-ceiling) 1.2
Office-Open Plan 1.1   High Bay (> 25' floor-to-ceiling) 1.7
Restrooms 0.9   Detailed Manufacturing 2.1
Stairs - Active 0.6   Equipment Room 1.2
Storage - Active 0.8   Control Room 0.5
 

For Hospital

 0.9 Museum  
Storage - Inactive 0.3   General Exhibition 1.0
 

For Museum

 0.8   Restoration 1.7
Workshop 1.9 Parking Garage - Parking Area 0.2
  Post Office - Sorting Area 1.2
Religious Buildings 1.5
  Worship-pulpit, choir 2.4
  Fellowship Hall 0.9
Retail (For accent lighting, see above)  
  Mall Concourse 1.7
  Sales Area 1.7
Sports Arena  
  Court Sports Area 2.3
  Indoor Playing Field Area 1.4
  Ring Sports Area 2.7

Transportation

  
  Airport - Concourse 0.6
  Air/Train/Bus - Baggage Area 1.0
  Terminal - Ticket Counter 1.5

Warehouse

  
  Fine Material Storage 1.4
  Medium/Bulky Material Storage 0.9
1 = In cases where both a common space type and a building specific space type are listed, the building specific space type shall apply.

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