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ASHRAE 90.1-2004

Section: 9.4.5 - Exterior Building Lighting Power

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 Requirements:

The total exterior lighting power allowance for all exterior building applications is the sum of the individual lighting power densities permitted in Table 9.4.5 for these applications plus an additional unrestricted allowance of 5% of that sum. Trade-offs are allowed only among exterior lighting applications listed in the Table 9.4.5 “Tradable Surfaces” section.

Exceptions:

Lighting used for the following exterior applications is exempt when equipped with a control device independent of the control of the nonexempt lighting:

  1. Specialized signal, directional, and marker lighting associated with transportation.
  2. Advertising signage or directional signage.
  3. Lighting integral to equipment or instrumentation and installed by its manufacturer.
  4. Lighting for theatrical purposes, including performance, stage, film production, and video production.
  5. Lighting for athletic playing areas.
  6. Temporary lighting.
  7. Lighting for industrial production, material handling, transportation sites, and associated storage areas.
  8. Theme elements in theme/amusement parks.
  9. Lighting used to highlight features of public monuments and registered historic landmark structures or buildings.

Q&A:

Q: May I trade wattage allowance between exterior and interior spaces? I.e. if I don't need all the watts I'm allowed to use outside, may I use them inside?

A: No, trade-offs between the two are not allowed.

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Table 9.4.5

Lighting Power Densities for Building Exteriors
Tradable Surfaces

Lighting power allowances for these applications may be traded.

Uncovered Parking Areas
Parking lots and drives 0.15 W/ft2
   

Building Grounds
Walkways less than 10' wide 1.0 W/linear foot
Walkways 10' wide or greater 0.2 W/ft2
Plaza areas
Special Features areas
   

Building Entrances and Exits
Main Entries 30 W/linear foot of door width
Other doors 20 W/linear foot of door width
   

Canopies and Overhangs
Canopies (free standing, attached or overhangs) 1.25 W/ft2
   

Outdoor Sales
Open Areas (including vehicle sales lots) 0.5 W/ft2
Street Frontage for vehicle sales lots in addition to Open Areas allowance 20 W/linear foot
Non-Tradable Surfaces

Lighting power allowances for these applications shall be used only for the specified application and may not be traded among surfaces or with any other power allowance. These densities are "Use-it-or-lose-it"

 Building Facades 0.2 W/ft2 for each illum. wall or surface

OR

5.0 W/linear foot for each illum. wall or surface length
Automated Teller Machines and Night Depositories 270 W per location plus

90 W per add. ATM at that location
Entrances and Gatehouse Inspection Stations at Guarded Facilities 1.25 W/ft2 of uncovered area
Loading Areas for Law Enforcement, Fire Stations, Ambulance Bays and other emergency service vehicles 0.5 W/ft2 of uncovered area
Drive-up windows at fast food restaurants 400 watts per drive through
Parking near 24-hour retail entrances 800 watts per main entrance
 

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