Definitions. The following terms shall, for the purpose of this section, have the meanings herein indicated:
An IESNA rating system of the Backlight, Uplight and Glare (forward) light distribution of an outdoor light fixture.
A rating of the dominant color tone of a light output from warm (reds and yellows) to cool (blue) expressed in degrees Kelvin (K).
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.
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.
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.
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.
The Illuminating Engineering Society of North America, the technical and educational authority on illumination.
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.
A device for producing light.
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 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.
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."
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.
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.
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.
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.
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.
Lighting displayed during and around a federally recognized holiday or Village festival on a seasonal basis.
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.
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.
Lighting installed and operated for periods not to exceed 60 days and not operated again for at least 30 days.
The ratio of the average lighting level to the minimum lighting level for a given area.