As used in this Chapter:
Backlight: Shall mean, for an outdoor luminaire, light, or fixture, lumens emitted in the quartesphere below horizontal and in the opposite direction of the intended orientation of the luminaire. For luminaires with symmetric distribution, backlight will be the same as the front light.
Board of Lighting Appeals: The Board of Zoning Appeals shall serve as the Board of Lighting Appeals with respect to hearing and deciding appeals relative to the application and enforcement
of this Ordinance.
BUG Rating: Shall mean the metric utilized for purposes of measuring the amount of backlight,
uplight, and glare emitted by any luminaire, light, or fixture as regulated by this Chapter. Backlight (B) is the light directed behind the fixture, uplight (U) is any light directed upward above the horizontal plane of the luminaire, and glare (G) is the amount of light emitted from the luminaire at high angles.
Candela: Shall mean the unit of luminous intensity that measures luminous power emitted by a light source in a particular direction, often expressed as “cd”.
Commercial: Shall mean any place of business or other location where commercial activities are conducted, any office, warehouse, or other commercial establishment, public or private institution, charitable establishment, gathering place or meeting hall, public use or quasi-public institutions, schools or other institutions devoted to the pursuit of higher learning, any religious institution or places of worship, any multi-family residential structure or group of structures containing four (4) or more units, or any other operations or activities classified as commercial uses and regulated as such, by any state, federal, or local agencies having jurisdictional authority to promulgate rules with respect to any such use.
Correlated Color Temperature (CCT): Color temperature defines the color appearance of a light source. CCT is defined in degrees Kelvin; a warm light is around 2700K, moving to neutral white at around 4000K, and to cool white, at 5000K or more.
Dark Sky Compliant Fixture: Shall mean a luminaire, light, or fixture that is designed to reduce and/or eliminate the unwanted negative impacts associated with wasted and/or poorly directed light, or otherwise as approved by the International Dark Sky Association.
Direct Light: Shall mean any light emitted directly from the lamp, the reflector, or reflector diffuser, or through the refractor or diffuser lens, of any light, luminaire, or fixture.
Fixture: Shall mean the assembly that houses any light bulb, lamp or lamps, or LED(s), and can include all or some of the following parts: a housing, a mounting bracket or pole socket, a lamp holder, a ballast, a driver, a reflector, or mirror, and/or a refractor or lens.
Flood or Spotlight: Shall mean any luminaire, light, fixture, or lamp that incorporates a reflector or a refractor to concentrate the light output into a directed or diffused beam in a particular direction.
Footcandle: Shall mean a measurement of light intensity or illuminance (also expressed as foot candle, foot-candle, fc, lm/ft2, or ft-c). One footcandle is equal to the amount of light required to saturate a one-foot square (1 sq.ft.) area with one lumen of light from a uniform source of light emitting from any luminaire, light, fixture, or lamp.
Fully shielded lights: Shall mean any outdoor light fixture that is shielded or constructed so that no light rays are emitted by the installed fixture at angles above the horizontal plane as certified by a photometric test report.
Glare: Shall refer to light emitting from a luminaire with an intensity great enough to reduce a viewer's ability to see, sometimes resulting in or causing momentary blindness, or any other lighting condition resulting in or leading to the visual sensation caused by excessive brightness, thereby causing annoyance, discomfort, or a disability loss in visual performance or visibility.
Ground Mounted: Shall mean any method by which any light, luminaire, or fixture is permanently or temporarily affixed to the ground as to project light on any horizontal or vertical plane, either in an outward, upward, or downward direction as to emit or project light onto any object, structure, feature, or building.
Height of Luminaire: The height of a luminaire shall be the vertical distance measured from the ground directly below the centerline of the luminaire to the lowest direct-light-emitting part of the luminaire.
Illuminance: Shall mean the measurement of the total amount of light or luminous flux falling onto and spreading over a given surface, measured in lux (lm/m2). Illuminance provides a measure of the intensity of light falling onto a surface.
Indirect Light: Direct light that has been reflected or has scattered off other surfaces.
Lamp: The component of a luminaire that produces the actual light. In LED fixtures it is the LED(s) or array.
Light-Emitting Diode (LED): A light-emitting diode (LED) shall mean a semiconductor light source that emits light when current flows through it.
Light Trespass: The directing of light produced by a luminaire beyond the boundaries of the property on which it is located.
Lumen: A unit of luminous flux (denoted by the abbreviation “lm”) which is the measure of the total amount of visible light from a lamp or light source. The higher the number of lumens, the brighter the lamp or other light source. One footcandle is one lumen per square foot. For the purposes of this Ordinance, the lumen-output values shall be the INITIAL lumen output ratings
of a lamp or other light source.
Luminaire: Shall mean a complete lighting system intended to emit light from a fixed location, which may include an LED(s), light bulb(s), lamp(s), and a fixture.
Luminance: Shall mean the measurement of the amount of light emitting, passing through or reflected from a surface from a solid angle. Luminance indicates how much luminous intensity can
be perceived by the human eye and can also indicate the brightness of light emitted or reflected off of a surface, often expressed as either “nit” or “cd/m2”.
Luminous Flux: Shall mean the measurement of the power of visible light produced by a light source, light, fixture, lamp, or luminaire, measured in lumens (lm). Luminous flux expresses the total amount of light which emitted by a lighting element, fixture, lamp, or luminaire, in all directions.
Lux: Shall mean a unit of illuminance, or luminous flux, per unit area, equal to one lumen per square meter. Lux is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface, often expressed as “lm/m2”.
Nit: Shall mean a unit of measurement that equals one candela per square meter, expressing the total luminance of any lighting element, fixture, lamp, or luminaire, often expressed as “cd/m2”.
Outdoor Lighting: Shall mean the nighttime illumination of an outside area or object by any man-made device located outdoors that produces light by any means.
Pole: Any natural or artificial device intended to secure the placement of a light, fixture, or luminaire, for the specific purpose of elevating the light fixture above the ground.
Pole Mounted: Any method by which any light, fixture, luminaire, or other light-emitting device is either permanently or temporarily affixed to a natural or manufactured pole, free standing structure not intended for occupancy, or other wire, string, or device intended to mechanically suspend a luminaire, lamp, or fixture as to result in the direction of light downward or outward from the fixed location.
Residential: Shall mean any single-family dwelling unit, two-family dwelling unit, or three-family dwelling unit contained within a single building envelope that is designed, occupied, and maintained for residential use at the time of adoption of this chapter.
Sky Glow: Sky glow shall mean the diffuse luminance of the night sky from artificial lighting, apart from discrete natural light sources such as the Moon and visible individual stars.
Temporary outdoor lighting: The specific illumination of an outside area or object by any man-made device located outdoors that produces light by any means for a period as permitted by
this Chapter.
Wall Mounted: Shall refer to any method utilized to permanently or temporarily secure any light, fixture, luminaire, or other light-emitting device to any permanent or temporary structure erected on any property, as to project light downward, upward, or outward from the fixture location onto any adjacent wall, street, parking area, sidewalk, entryway, or other horizontal or vertical service adjacent to or nearby the fixture location.
(Ord. 2023-60. Passed 5-23-23.)