Dobbins JLUS IMP Public Draft Light Pollution Study | Page 276

MODEL LIGHTING ORDINANCE - USER’S GUIDE
MODEL LIGHTING ORDINANCE - TEXT
X. DEFINITIONS - Ordinance Text
X. DEFINITIONS - User’s Guide
Definitions are typically generally added to any code when new code
sections are added. The definitions are legally required and play a
significant role in the interpretation of the ordinance and code.
Most city attorneys will not accept references to outside sources
regardless of credibility, such as the IES Handbook. Thus as a general
rule, a definition for an unfamiliar term (e.g. lumens) must be added
by the adopting ordinance.
When adopting or integrating the MLO definitions, be sure to retire
conflicting technical terminology. In particular, the latest IES Luminaire
Classification System as defined in IES TM-15-07 is likely to need
attention.
Absolute
Photometry
Lighting designed to reveal architectural
Architectural Lighting beauty, shape and/or form and for which
lighting for any other purpose is incidental.
The adopting municipality, agency or other
Authority
governing body.
An automatic lighting control device that
Astronomic
switches outdoor lighting relative to time of
Time Switch
solar day with time of year correction.
For an exterior luminaire, lumens emitted in
the quarter sphere below horizontal and in the
opposite direction of the intended orientation
Backlight
of the luminaire. For luminaires with
symmetric distribution, backlight will be the
same as front light.
Canopy A luminaire classification system that clas-
sifies backlight (B), uplight (U) and glare (G).
A covered, unconditioned structure with at
least one side open for pedestrian and/or
vehicular access. (An unconditioned structure
is one that may be open to the elements and
has no heat or air conditioning.)
Common
Outdoor
Areas One or more of the following: a parking lot;
a parking structure or covered vehicular
entrance ; a common entrance or public space
shared by all occupants of the domiciles.
Curfew A time defined by the authority when outdoor
lighting is reduced or extinguished.
BUG
USER’S GUIDE - Page 34
Page B-34
Photometric measurements (usually of a
solid-state luminaire) that directly measures
the footprint of the luminaire. Reference
Standard IES LM-79
ORDINANCE TEXT - Page 34
Appendix B: Model Lighting Ordinance