Dobbins JLUS IMP Public Draft Light Pollution Study | Page 301

Pattern Outdoor Lighting Code
Standard ver. 2.0
Pattern Outdoor Lighting Code
Standard ver. 2.0
15.31 Outdoor Light Output, Total. The initial total amount of light, measured in
lumens, from all lamps used in outdoor light fixtures. Includes all lights and
luminous tubes used for Class 1, Class 2, Class 3 and multi-Class lighting,
and lights used for external illumination of signs, but does not include lights used
to illuminate internally illuminated signs, luminous tubes used in neon signs,
or seasonal lighting from typical low-output lamps permitted between
Thanksgiving and January 15th. For lamp types that vary in their output as they
age (such as high pressure sodium, fluorescent and metal halide), the initial lamp
output, as defined by the manufacturer, is the value to be considered. For LED
fixtures, the light output of the fixture, as defined by the manufacturer, is the
value to be considered. For determining compliance with Section 4.2 [Total
Outdoor Light Output] of this Code, the light emitted from lamps and luminous
tubes is to be included in the total output as follows (see Figures 15.31a/b):
A. outdoor light fixtures installed on poles (such as parking lot light fixtures)
and light fixtures or luminous tubes installed on the sides of buildings or
other structures, when not shielded from above by the structure itself as
defined in parts B, C and D below, are to be included in the total outdoor
light output by simply adding the initial lumen outputs of the lamps and
tubes;
B. outdoor light fixtures and luminous tubes installed under canopies,
buildings (including parking garage decks), overhangs or roof eaves where all
parts of the lamp, tube or light fixture are located at least five (5) feet but less
than ten (10) feet from the nearest edge of the canopy or overhang are to be
included in the total outdoor light output as though they produced only one-
quarter (0.25) of the lamp's rated initial lumen output;
C. outdoor light fixtures and luminous tubes installed under canopies,
buildings (including parking garage decks), overhangs or roof eaves where all
parts of the lamp, tube or light fixture are located at least ten (10) feet but
less than thirty (30) feet from the nearest edge of the canopy or overhang are
to be included in the total outdoor light output as though they produced only
one-tenth (0.10) of the lamp's or tube’s rated initial lumen output.
D. outdoor light fixtures and luminous tubes installed under canopies,
buildings (including parking garage decks), overhangs or roof eaves where all
parts of the lamp or light fixture are located thirty (30) or more feet from the
nearest edge of the canopy or overhang are not to be included in the total
outdoor light output. Such lamps and tubes must however conform to the
lamp source and shielding requirements of Section 4.
Figure 15.31a. Plan view of a canopy, showing fixture location and initial lamp
output percentage counted toward Total Outdoor Light Output.
Figure 15.31b. Elevation view of a canopy or overhang attached to a building,
showing location of fully shielded fixtures and initial lamp output percentage
counted toward Total Outdoor Light Output.
15.32 Parking Garage. A multi-level or covered structure for parking that is open to
the outside air. Includes parking facilities under buildings when the area is open
to the outside at more locations than just the automobile entries and exits.
Appendix C: Pattern Outdoor Lighting Guide
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Page C-13
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