Definitions: As used in this section, the following terms shall have the meanings indicated:
ABSOLUTE PHOTOMETRYPhotometric measurements (usually of a solid-state luminaire) that directly measures the footprint of the luminaire.
ARCHITECTURAL LIGHTINGLighting designed to reveal architectural beauty, shape and/or form and for which lighting for any other purpose is incidental.
ASTRONOMIC TIME SWITCHAn automatic lighting control device that switches outdoor lighting relative to time of solar day with time of year correction.
BACKLIGHTFor an exterior luminaire, lumens emitted in the quarter sphere 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 front light.
BUGThe luminaire classification system that classifies backlight (B), uplight (U) and glare (G) to evaluate luminaire optical performance related to light trespass, sky glow, and high angle brightness control. The BUG ratings are based on a zonal lumen calculation for secondary solid angles, based on data from photometric testing procedures approved by the IESNA.
CANOPYA 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 AREASOne or more of the following: a parking lot; a parking; a common entrance or public space structure or covered vehicular entrance shared by all occupants of the domiciles.
CURFEWA time defined by the governing body when outdoor lighting is reduced or extinguished.
EMERGENCY CONDITIONSGenerally, lighting that is only energized during an emergency; lighting fed from a backup lighting power source; or the path for illuminating of egress solely during a fire or other emergency situation; or, lighting for security purposes used solely during an alarm.
FOOTCANDLEThe unit of measure expressing the quantity of light received on a surface. One footcandle is the illuminance produced by a candle on a surface one foot square from a distance of one foot.
FORWARD LIGHTFor an exterior luminaire, lumens emitted in the quarter sphere below horizontal and in the direction of the intended orientation of the luminaire.
FULLY SHIELDED LUMINAIREA luminaire constructed and installed in such a manner that all light emitted by the luminaire, either directly from the lamp or a diffusing element, or indirectly by reflection or refraction from any part of the luminaire, is projected below the horizontal plane through the luminaire's lowest light-emitting part.
GLARELighting entering the eye directly from luminaires or indirectly from reflective surfaces that causes visual discomfort or reduced visibility.
HARDSCAPEPermanent hardscape improvements to the site including parking lots, drives, entrances, curbs, ramps, stairs, steps, medians, walkways and non-vegetated landscaping that is 10 feet or less in width. Materials may include concrete, asphalt, stone, gravel, etc.
HARDSCAPE AREAThe area measured in square feet of all hardscape. It is used to calculate the total site lumen limit in both the prescriptive method and performance methods. Refer to "hardscape" definition.
HARDSCAPE PERIMETERThe perimeter measured in linear feet is used to calculate the total site lumen limit in the performance method. Refer to "hardscape" definition.
IDAThe International Dark-Sky Association.
IESNAThe Illuminating Engineering Society of North America.
LAMPA generic term for a source of optical radiation (i.e., light), often called a "bulb" or tube." Examples include incandescent, fluorescent, high-intensity discharge (HID) lamps, and low-pressure sodium (LPS) lamps, as well as light-emitting diode (LED) modules and arrays.
LANDSCAPE LIGHTINGLighting of trees, shrubs, or other plant material as well as ponds and other landscape features.
LANDSCAPE LIGHTING, LOW VOLTAGELandscape lighting powered at less than 15 volts and limited to luminaires having a rated initial luminaire lumen output of 525 lumens or less.
LIGHT POLLUTIONAny adverse effect of artificial light including, but not limited to, glare, light trespass, skyglow, energy waste, compromised safety and security, and impacts on the nocturnal environment.
LIGHT TRESPASSLight that falls beyond the property it is intended to illuminate.
LIGHTINGElectric, man-made or artificial lighting. See "lighting equipment."
LIGHTING EQUIPMENTEquipment specifically intended to provide gas or electric illumination, including, but not limited to, lamp(s), luminaire(s), ballast(s), poles, posts, lens(es), and related structures, electrical wiring, and other necessary or auxiliary components.
LIGHTING ZONEAn overlay zoning system establishing legal limits for lighting for particular parcels, areas, or districts in a community.
LUMENThe unit of measure used to quantify the amount of light produced by a lamp or emitted from a luminaire (as distinct from "watt," a measure of power consumption).
LUMINAIREThe complete lighting unit (fixture), consisting of a lamp, or lamps and ballast(s) (when applicable), together with the parts designed to distribute the light (reflector, lens, diffuser), to position and protect the lamps, and to connect the lamps to the power supply.
LUMINAIRE LUMENSFor luminaires with relative photometry, it is calculated as the sum of the initial lamp lumens for all lamps within an individual luminaire, multiplied by the luminaire efficiency. If the efficiency is not known for a residential luminaire, assume 70%. For luminaires with absolute photometry, it is the total luminaire lumens. The lumen rating of a luminaire assumes the lamp or luminaire is new and has not depreciated in light output.
LUXThe SI unit of illuminance. One lux is one lumen per square meter. 1 Lux is a unit of incident illuminance approximately equal to 1/10 footcandle.
MOUNTING HEIGHTThe height of the photometric center of a luminaire above grade level. The horizontal spacing of poles is often measured in units of "mounting height." Example: "The luminaires can be spaced up to four mounting heights apart."
NEW LIGHTINGLighting for areas not previously illuminated; newly installed lighting of any type except for replacement lighting or lighting repairs.
OBJECTA permanent structure located on a site. "Objects" may include statues or artwork, garages or canopies, outbuildings, etc.
OBJECT HEIGHTShall mean the highest point of an entity, but shall not include antennas or similar structures.
ORNAMENTAL LIGHTINGLighting that does not impact the function and safety of an area but is purely decorative, or used to illuminate architecture and/or landscaping, and installed for aesthetic effect.
ORNAMENTAL STREETLighting shall mean a luminaire intended for illuminating streets that serves a decorative function in addition to providing optics that effectively deliver street lighting. It has a historical period appearance or decorative appearance, and has the following design characteristics:
1. Designed to mount on a pole using an arm, pendant, or vertical tenon;
2. Opaque or translucent top and/or sides;
3. An optical aperture that is either open or enclosed with a flat, sag or drop lens;
4. Mounted in a fixed position; and
5. With its photometric output measured using Type C photometry per IESNA LM-75-01.
OUTDOOR LIGHTINGLighting equipment installed within the property line and outside the building envelopes, whether attached to poles, building structures, the earth, or any other location; and any associated lighting control equipment.
PARTLY SHIELDED LUMINAIREA luminaire with opaque top and translucent or perforated sides, designed to emit most light downward.
PEDESTRIAN HARDSCAPEStone, brick, concrete, asphalt or other similar finished surfaces intended primarily for walking, such as sidewalks and pathways.
PHOTOELECTRIC SWITCHA control device employing a photocell or photodiode to detect daylight and automatically switch lights off when sufficient daylight is available.
PROPERTY LINEThe edges of the legally-defined extent of privately owned property.
RELATIVE PHOTOMETRYPhotometric measurements made of the lamp plus luminaire, and adjusted to allow for light loss due to reflection or absorption within the luminaire. Reference standard: IES LM-63.
REPAIR(S)The reconstruction or renewal of any part of an existing luminaire for the purpose of its ongoing operation, other than relamping or replacement of components including capacitor, ballast or photocell. Note that retrofitting a luminaire with new lamp and/or ballast technology is not considered a repair and for the purposes of this section the luminaire shall be treated as if new. "Repair" does not include normal relamping or replacement of components including capacitor, ballast or photocell.
REPLACEMENT LIGHTINGLighting installed specifically to replace existing lighting that is sufficiently broken to be beyond repair.
SALES AREAAn uncovered area used for sales of retail goods and materials, including but not limited to automobiles, boats, tractors and other farm equipment, building supplies, and gardening and nursery products.
SHIELDED DIRECTIONAL LUMINAIREA luminaire that includes an adjustable mounting device allowing aiming in any direction and contains a shield, louver, or baffle to reduce direct view of the lamp.
SIGNAdvertising, directional or other outdoor promotional display of art, words and/or pictures.
SKY GLOWThe brightening of the nighttime sky that results from scattering and reflection of artificial light by moisture and dust particles in the atmosphere. Skyglow is caused by light directed or reflected upwards or sideways and reduces one's ability to view the night sky.
TEMPORARY LIGHTINGLighting installed and operated for periods not to exceed 60 days, completely removed and not operated again for at least 30 days.
THIRD PARTYA party contracted to provide lighting, such as a utility company.
TIME SWITCHAn automatic lighting control device that switches lights according to time of day.
TRANSLUCENTAllowing light to pass through, diffusing it so that objects beyond cannot be seen clearly (not transparent or clear).
UPLIGHTShall mean, for an exterior luminaire, flux radiated in the hemisphere at or above the horizontal plane.
VERTICAL ILLUMINANCEIlluminance measured or calculated in a plane perpendicular to the site boundary or property line.