(a) 
The purposes of this article are to:
(1) 
Permit reasonable uses of outdoor lighting for nighttime safety, utility, security, and enjoyment while preserving the ambiance of the nighttime environment;
(2) 
Curtail and reverse degradation of the nighttime visual environment and the night sky; conserve energy and resources to the greatest extent possible
(3) 
Minimize glare and obtrusive light by limiting outdoor lighting that is misdirected, excessive, or unnecessary; and
(4) 
Reduce and abate improper lighting in public spaces.
(b) 
All outdoor lighting shall be installed, operated and maintained in conformance with this article and the provisions of this code, including but not limited to the city’s adopted building and electrical codes and sign regulations, as amended and as applicable, and under permit and inspection where required. To the extent that conformance with this article conflicts with any other ordinance, code, or regulation of the city, the more restrictive/stringent of the conflicting provisions shall govern.
(Ordinance 571-15, sec. 2, adopted 8/18/15)
For the purposes of this article, the following words shall have the following meanings, except where the context clearly indicates a different meaning.
Acre or net acre.
Any 43,560 contiguous square feet or total of portions thereof within the same parcel if dissected by existing roads or land dedicated for roads.
Aggregate light level.
The total sum of all lumens emitted from all luminaires and outdoor lighting fixtures on a tract or lot of real property.
Fixture.
An assembly that holds a lamp or bulb in a lighting system. It includes the elements designed to give light output control, such as a reflector (mirror) or refractor (lens), the ballast, housing, and the attachment parts.
Footcandle.
A unit of measure of intensity of light falling on a surface equal to one lumen per square foot. It has been replaced in International System by the candela (one lumen per square meter).
Full cutoff (fco) fixture.
A fixture designed or manufactured such that all upward transmission of light is cut off, blocked or shielded above a horizontal plane through the lighting fixture’s lowest part.
HID lighting.
High intensity discharge lighting, a family of bulb type including mercury vapor, metal halide, high pressure or low pressure sodium, which glow when an electric current is passed through a gas mixture inside the bulb.
Horizontal (or vertical) footcandles.
The measurement of the amount of light striking a vertical or a horizontal plane.
LED lighting or light-emitting diodes:
A p-n junction solid state diode whose radiated output is a function of its physical construction, material used and existing current.
Light pollution.
The shining of light produced by a luminaire above the height of the luminaire and into the sky.
Light source.
The bulb and lens, diffuser, or reflective enclosure.
Light trespass.
Light projected onto a property from a fixture or artificial light source not located on that property.
Lighting inventory.
A listing or inventory of lamps indicating the bulb type, bulb wattage, and manufacturer through which the rated lumens can be determined.
Lighting zone 1.
Developed areas in parks, recreation areas, and wildlife preserves; developed areas in natural settings; areas near astronomical observatories; and sensitive environments as determined and so designated by the city.
Lighting zone 2.
Rural areas; low density urban neighborhoods and districts; and residential historic areas. All areas in the city are deemed within lighting zone 2 unless designated otherwise.
Lighting zone 3.
Reserved for very limited applications specifically designated by the city and may include areas such as major city centers, urban districts with high security requirements, thematic attractions, and entertainment districts.
Lumen.
A unit of light quantity equal to the light on a unit surface all points of which are at a unit distance from a point source of light having a strength of one candle.
Luminaire.
A complete lighting unit, consisting of a light source and all necessary mechanical, electrical, and decorative parts.
Outdoor lighting fixture.
Any type of fixed or movable lighting equipment that is designed or used for illumination outdoors. The term includes billboard lighting, streetlights, searchlights, and other lighting used for advertising purposes and area lighting. The term does not include lighting equipment that is required by law to be installed on motor vehicles or lighting required for the safe operation of aircraft.
Site lighting.
Any pole or wall mounted lighting fixture intended to provide illumination for areas other than covered walkways. These areas shall include, but not be limited to; parking lots, walking paths, sidewalks within and along parking areas as well as any other outdoor area intended for pedestrian use. All sight lighting shall be LED lighting. Other lighting types proven to produce equivalent lighting output and distribution may be approved for use by the city council.
(Ordinance 571-15, sec. 2, adopted 8/18/15)