Definitions. The following terms shall, for the purpose of this section,
have the meanings herein indicated:
BUG RATING
An IESNA rating system of the Backlight, Uplight and Glare
(forward) light distribution of an outdoor light fixture.
FOOTCANDLE (fc)
The measure of illuminance produced on a surface one foot
square from a distance of one foot. One footcandle is equal to one
lumen per square foot.
FULL CUT-OFF FIXTURE
An IESNA classification that describes a lighting fixture
constructed and installed such that it emits no light at and above
an angle of 90° above the horizontal plane, and that reduces glare
by limiting maximum light to less than 10% of rated lumens between
80° and 90° (the "glare zone"). This applies to all lateral
angles around the fixture.
FULLY SHIELDED FIXTURE
A lighting fixture constructed and installed in such a manner
that all light emitted by the fixture, either directly from the lamp
or a diffusing element, or indirectly by reflection or refraction
from any part of the fixture, is projected below the horizontal plane
running through the lowest point on the fixture where light is emitted.
Fully shielded fixtures emit no direct uplight but have no limitation
on the intensity of light in the region between 80° and 90°
above nadir. A fully shielded fixture has a maximum BUG uplight rating
of U0.
GLARE
Stray unshielded light striking the eye that may result in:
a) nuisance or annoyance such as light shining in a window; b) discomfort
causing squinting of the eyes; c) disabling vision by reducing the
ability of the eyes to see into shadows; d) reduction of visual performance.
Note: As used in this section, this term is not synonymous with the
term glare as used in the BUG rating defined above.
IESNA
The Illuminating Engineering Society of North America, the
technical and educational authority on illumination.
ILLUMINANCE
The amount of light falling on a surface area. Illuminance
is measured in either footcandles (lumens per square foot), or lux
(lumens per square meter). One footcandle equals 10.76 lux, although
for convenience, 10 lux commonly is used as the equivalent.
LAMP
A device for producing light.
LIGHT POLLUTION
Any adverse effect of artificial light, including, but not
limited to, glare, light trespass, sky-glow, energy waste, and impacts
on the nocturnal environment.
LIGHT TRESPASS
Light from an artificial light source that is cast beyond
the boundaries of the property on which the lighting fixture is sited.
Light trespass includes glare from a direct light as well as spill
light.
LIGHTING FIXTURE
A complete lighting unit consisting of one or more lamps,
together with the parts designed to distribute the light (reflector,
lens, diffuser), position and protect the lamp(s), and connect the
lamp(s) to the power supply, but not including the support assembly
(pole or mounting bracket). Also referred to as a "luminaire."
LUMEN
A unit of measure used to quantify the amount of light produced
by a lamp (as distinct from "watt," a measure of electrical power
consumption) in a given period of time.
LUX
A metric unit of measure used to quantify the amount of light
produced by a lamp. One lux is equivalent to one lumen per square
meter, which is equal to approximately 1/10 footcandle.
OUTDOOR LIGHTING
The illumination of an outside area or object by any man-made
device located outdoors that produces light by any means, whether
attached to poles, buildings, structures, the earth, or in any other
location, and any associated lighting control equipment.
OUTDOOR LIGHTING FIXTURE
A lighting fixture installed outdoors, either permanently
or portable, used for illumination, decoration, or advertisement.
Such devices shall include, but are not limited to, lighting fixtures
used to illuminate: buildings and structures, including overhangs
and canopies; parking lots; streets and driveways; sidewalks, paths
and walkways; recreational areas; landscape lighting; architectural
lighting; signs; product display and service areas; and security lighting.
REPLACEMENT
The installation of a new lighting fixture in place of an
existing fixture, and/or the installation of a new lighting housing
or head to an existing pole, bracket, wall, tree or other structure.
Replacement does not mean the changing of light bulbs or lamps in
a fixture for the same or lower wattage bulbs.
SEASONAL HOLIDAY LIGHTING
Lighting displayed during and around a federally recognized
holiday or Village festival on a seasonal basis.
SECURITY LIGHTING
The minimum amount of outdoor lighting necessary to illuminate
points of entry into or exit from a structure, exterior walkways,
or outdoor storage areas for purposes of night-time safety. Security
lighting shall not include any lighting that is primarily for aesthetic
or advertising purposes and does not directly contribute to the safety
or security of the premises, such as signs, parking lot lighting,
display lighting, architectural lighting or landscape lighting.
SKY-GLOW
The brightening of the sky that results from scattering and
reflection of artificial light by moisture and dust particles in the
atmosphere. Sky-glow is caused by light directed or reflected upwards
or sideways and reduces one's ability to view the night sky.
TEMPORARY LIGHTING
Lighting installed and operated for periods not to exceed
60 days and not operated again for at least 30 days.
UNIFORMITY RATIO
The ratio of the average lighting level to the minimum lighting
level for a given area.