Architectural lighting. Outdoor lighting directed at buildings, facades, structures, monuments, and other architectural features.

Commercial lighting zone. Any zoning lot in any zoning district that does not have as its primary use a single-family residential dwelling, a two-family residential dwelling, land used for agriculture, or land used for industrial purposes.

CST. Central Standard Time, including the local change in time for daylight savings time.

Footcandle. A unit of measurement of luminous flux.

Full cutoff. Light distribution from a luminaire (excluding not more than 0.5 percent incidental uplight from poles, mounting brackets, and other supporting structures), as determined by photometric test and certified by the manufacturer, such that no light is emitted at or above an angle of 90° above nadir in any direction and the luminous flux emitted in the band between 80° and 90° above nadir in all directions is no more than ten (10) percent of the total luminous flux for the luminaire.

Glare. A visual disturbance produced by a distinct light source within the visual field that is sufficiently brighter than the level to which the eyes are adapted.

HID lighting. A high-intensity discharge family of lighting that includes high-pressure sodium, fluorescent, mercury vapor, and metal halide type bulbs.

Illuminance. The amount of luminous flux falling onto a unit of surface area, correlating to the perception of brightness by the human eye. Illuminance is typically measured in lumens per square foot (footcandles) or lumens per square meter (lux).

Industrial lighting zone. A lighting area on any zoning lot in an industrial zoning district that is used typically relating to, concerning or arising from the manufacturing, assembling, fabrication, finishing, packaging, or processing of goods.

Installed height. The height above grade of the lowest point on an installed luminaire.

Internally illuminated sign. A sign illuminated by a light source internal to the sign enclosure which is not directly visible externally, including neon-light signs.

LAMP. The source of light being emitted from a luminaire, such as a bulb.

Landscape lighting. Outdoor lighting directed at trees, shrubs, plants, flower beds, fountains, gardens, and other natural or landscaped features.

Light. Electromagnetic radiation within a range of wavelengths sufficient for visual perception by the normal unaided human eye.

Light level. The illuminance as measured in accordance with the practices contained in the Illumination Engineering Society of North America Lighting Handbook, Eighth Edition.

Light output. The initial lumen rating declared by the manufacturer, which consists of the lumen rating of a lamp at the end of one hundred (100) hours of operation.

Lighting installation. An arrangement of one or more luminaires including any mounting hardware, brackets, and supporting structures.

Lumen. A unit of measure of luminous flux. "Lumens" denotes initial lumens for HID lighting applications.

Luminaire. An individual lighting assembly including the lamp and any housings, reflectors, globes, lenses, shields or other components designed to block or distribute light, but does not include internally illuminated signs.

Luminance. A measure of the brightness of a surface which is emitting light. The unit of measurement most commonly used is candelas per square meter, often referred to as nits in the USA (1 nit=1 cd/m2). The nocturnal appearance and environmental effect of objects such as internally lit signs may be analyzed both by total light output (lumens) and by their surface brightness (nits).

Luminous flux. The power emitted from a source of electromagnetic radiation, such as a light bulb, in the form of visible light. Luminous flux is measured in lumens (or lux) and is typically specified by the manufacturer for a given lamp or luminaire. Typical luminous flux values for incandescent bulbs are 100W: 1550 lumens, 75W: 1080 lumens, 60W: 780 lumens, and 40W: 450 lumens.

Motion-activated sensor. A sensor which causes a luminaire to become illuminated automatically upon the presence of motion or infrared radiation or a combination thereof within its field of view.

Nadir. The direction pointing directly downward from the light source of the luminaire that originates from a horizontal plane at the lowest point on the luminaire.

Neon light. Brightly colored light generated by using electric current to excite a gas or gas mixture (including neon, argon, helium, and other gases) typically contained in a tube which can be bent into various forms or use as decoration or signs. Fluorescent tubes are not considered a neon light.

Nit(s). A unit of measure of luminance.

Organized sporting event. A prearranged sports or recreational event involving at least one group or team with a published roster and schedule.

Outdoor display lot. An outdoor area whose primary function is the sale of displayed merchandise, often requiring accurate color perception by customers.

Outdoor lighting. Light generated from an indoor or outdoor source that provides illumination to a surface, building, sign, structure, device, or other outdoor feature which is visible to an observer located outdoors. Outdoor Lighting does not include the light source inside an internally illuminated sign.

Playing field. An open outdoor field or court used for playing sports such as baseball, soccer, football, tennis, skate park, volleyball, and basketball.

Public parking areas. A drivable surface intended for use by the general public for parking motorized vehicles.

Residential lighting zone. Any zoning lot in a residential or agricultural zoning district that has as its primary use a single-family residential dwelling or a two-family residential dwelling.

Searchlight. A lighting installation designed to project a high-intensity beam of approximately parallel rays of light that is typically used to sweep the sky for promotional purposes.

Shielding. A luminaire which uses shielding, lenses, or other means to provide distinct directional focused beam of emitted light.

Street lighting. One or more luminaires or light installations designed to illuminate a public roadway or intersection.

Uplighting. Lighting applications which direct light above a horizontal plane.