Dobbins JLUS IMP Public Draft Light Pollution Study | Page 258

MODEL LIGHTING ORDINANCE - USER’S GUIDE
PERFORMANCE METHOD - User’s Guide
The performance method is best for projects with complex lighting
requirements or when the applicant wants or needs more flexibility in
lighting design. The performance method is also used when any lighting
designer plans to aim or direct any light fixture upward (above 90 degrees).
An engineer or lighting professional generally will be required to design
within the performance method. An adopting jurisdiction may also wish
to hire an engineer or lighting professional to review and approve projects
using this method and/or incorporate review of the performance method
into special review procedures.
The Performance Method is also best for projects where higher lighting
levels are required compared to typical area lighting. An example might be
a car sales lot where more light might be required on the new cars than
would be needed for a standard parking lot. Another example is a gas station
canopy requiring more light than a building entrance canopy.
MODEL LIGHTING ORDINANCE - TEXT
IV. NON-RESIDENTIAL LIGHTING (cont.) - Ordinance Text
B. Performance Method
1. Total Site Lumen Limit
The total installed initial luminaire lumens of all lighting systems on
the site shall not exceed the allowed total initial site lumens. The
allowed total initial site lumens shall be determined using Tables D
and E. For sites with existing lighting, existing lighting shall be
included in the calculation of total installed lumens.
The total installed initial luminaire lumens of all is calculated as the sum of the
initial luminaire lumens for all luminaires.
The first step in the Performance Method regulates overlighting by
establishing the Total Initial Site Lumens (Table D) that are allowed.
Allowances include the summation of the following (Table D):
1) Initial lumen allowance per site
2)Per area (SF) of hardscape
Table E allows additional lumens for unique site conditions.
Examples of allowances include:
1)Per building entrance/exit
2)Per length (linear feet) of Outdoor Sales Frontage Perimeter
3)Per area (SF) of Vehicle Service Station Canopy
4)Plus more …
The Site Total Initial Site Lumens allowed are a combination of
allowances from Table D and Table E.
USER’S GUIDE - Page 16
Page B-16
ORDINANCE TEXT - Page 16
Appendix B: Model Lighting Ordinance