§ 14-242. Definitions.

As used in this article, the following terms shall be defined as follows:

Business: A person, partnership, corporation, or organization engaged in commerce, manufacturing, or a service; profit and non-profit seeking enterprise or concern. The definition is intended to be broadly construed and shall include, but not be limited to, charitable organizations.

Candela: The unit of measure indicating the luminous intensity (candlepower) of a light source in a specific direction.

Digital sign: Catho-ray tube (CRT), flat panel liquid-crystal display (LCD), plasma, aerial imaging, projector or other electronic devices that are at the end-point of a digital signage system, presenting the content to include: dynamic signs, electronic signs, digital media advertising, as well as signs within a digital signage network, in-store TV network, captive audience network, narrowcasting network, out-of-home media network, digital media network, and advertising network.

Direct light: Light emitted directly from the lamp, off of the reflector diffuser, or through the refractor or diffuser lens of a luminaire.

Exempted nonconforming luminaires: Any existing luminaires which were lawfully in place according to all applicable City ordinances at the time, but which do not now comply with all applicable regulations as of the effective date of District designation.

Foot-candle (fc): A unit of light measurement equal to one lumen per square foot.

Full cutoff: Describes a luminaire light distribution where 100 candela per 1,000 lamp lumens (ten percent) may emit at all vertical angles beginning at 80 degrees up from nadir to less than 90 degrees, and 0 candela per 1,000 lamp lumens (zero percent) is allowed at 90 degrees (horizontal plane) and all angles above. This applies to all horizontal angles around the luminaire. A full cutoff luminaire is also fully shielded. (See Exhibit 2).

Exhibit 2

Fully shielded: A lighting fixture constructed 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 luminaire, is projected below the horizontal plane as determined by photometric test or certified by the manufacturer. A fully shielded fixture is not necessarily full cutoff.

Gasoline filling station: A retail outlet for the dispensing of vehicular fuels to the general public. Diesel fuel storage on site shall be limited to a maximum of 5,000 gallons.

Glare: A luminance produced by bright sources in the field-of-view superimposed on the image in the eye reducing contract and hence visibility.

IESNA (or IES): An acronym for the Illuminating Engineering Society of North America. The IESNA makes recommendations for outdoor lighting but does not set outdoor lighting community standards which are set through local regulations.

Illuminance: The quantity of light arriving at a surface measured in foot-candles.

Intermittent lighting: Luminaires that do not remain on for more than five minutes.

Lumen: A unit of luminous flux. For purposes of this article, the lumen-output values shall be the initial lumen output ratings of a lamp. The lumen rating associated with a given lamp is generally indicated on its packaging or may be obtained from the manufacturer.

Luminaire: A complete lighting fixture consisting of a lamp or lamps together with the parts designed to distribute the light, to position and protect the lamps and to connect the lamps to the power supply.

Luminous flux: A quantitative expression of the brilliance of a source of visible light which is electromagnetic energy within the wavelength range of approximately 390 nanometers (nm) to 770 nm. This quantity is measured in terms of the power emitted per unit solid angle from an isotropic radiator, a theoretical point source that radiates equally in all directions in three-dimensional space.

Nadir: The direction pointing vertically down from the lowest light emitting part of the luminaire (see Exhibit 2 for an example).

Nit: A unit of illuminative brightness equal to one candle per square meter, measured perpendicular to the rays of the source.

Outdoor lighting: Illumination of an outside area or object by any man-made device that is located outdoors and produces light.

Temporary outdoor lighting: Lighting allowed as specified in an approved temporary permit pursuant to the requirements of subsection 14-256(9) below.

Trespass lighting: Light emitted by a luminaire that falls outside the boundaries of the property on which the luminaire is sited.

(Ord. No. 100-02-09, § 2, 2-17-2009)