Dobbins JLUS IMP Public Draft Light Pollution Study | Page 284

MODEL LIGHTING ORDINANCE - USER’S GUIDE
XI. OPTIONAL STREETLIGHT ORDINANCE - User’s Guide
This section was added since the first public review. It is designed to
work closely with the proposed revision to ANSI/IES RP-8 Standard
Practice for Roadway and Street Lighting.
MODEL LIGHTING ORDINANCE - TEXT
XI. OPTIONAL STREETLIGHT ORDINANCE - Ordinance Text
Note to the adopting authority: the intent of this section is that it only
applies to streets and not to roadways or highways.
A. Preamble
Street and roadway lighting is one of the world's largest causes of
artificial skyglow. Many adopting agencies will recognize that the
MLO will make privately owned lighting more efficient and
environmentally responsible than their street lighting systems. But
because the process of designing street lighting often requires more
precise lighting calculations, applying the MLO directly to street
lighting is not advised. Using existing standards of street lighting is
recommended, particularly IES RP-8 and AASHTO standards.
Until a new recommended practice for street lighting can be
developed, this section can serve to prevent most of the uplight of
street lighting systems without setting specific requirements for the
amount of light, uniformity of light, or other performance factors.
Adopting agencies should include these basic improvements to
street lighting along with regulations to private lighting.
Lighting streets with “period” ornamental luminaires that evoke the
look of a time when the light source was a gas flame can cause glare
if high-lumen lamps are used. Such ornamental street lights should
not exceed a BUG rating of G1. If additional illuminance and/or
uniformity is desired, the ornamental fixtures should be supple-
mented by higher mounted fully shielded luminaires, as illustrated
in RP-33-99.
Few street lighting warranting processes exist. The adopting agency
needs to gauge whether a complex warranting systems is required,
or if a simple one using posted speeds, presence of pedestrians, or
other practical considerations is sufficient.
Examples of a current street lighting warranting system are included
in the Transportation Association of Canada's Guide for the Design
of Roadway Lighting 2006.
Page B-42
USER’S GUIDE - Page 42
The purpose of this Ordinance is to control the light pollution of street
lighting, including all collectors, local streets, alleys, sidewalks and bike-
ways, as defined by ANSI/IES RP-8 Standard Practice for Roadway and
Street Lighting and in a manner consistent with the Model Lighting
Ordinance.
B. Definitions
Roadway or Highway lighting is defined as lighting provided for freeways,
expressways, limited access roadways, and roads on which pedestrians,
cyclists, and parked vehicles are generally not present. The primary purpose
of roadway or highway lighting is to help the motorist remain on the roadway
and help with the detection of obstacles within and beyond the range of the
vehicle's headlights.
Street lighting is defined as lighting provided for major, collector, and local
roads where pedestrians and cyclists are generally present. The primary
purpose of street lighting is to help the motorist identify obstacles, provide
adequate visibility of pedestrians and cyclists, and assist in visual search
tasks, both on and adjacent to the roadway.
Ornamental Street Lighting is defined as a luminaire intended for illuminat-
ing streets that serves a decorative function in addition to providing optics
that effectively deliver street lighting. It has a historical period appearance
or decorative appearance, and has the following design characteristics:
· designed to mount on a pole using an arm, pendant, or vertical tenon;
· opaque or translucent top and/or sides;
· an optical aperture that is either open or enclosed with a flat, sag or
drop lens;
· mounted in a fixed position; and
· with its photometric output measured using Type C photometry per
IESNA LM-75-01.
Appendix
Model
ORDINANCE
TEXT - B: Page
42 Lighting Ordinance