18.85.040 General requirements.
(A) Illumination in General. Exterior lighting shall provide for appropriate and desirable nighttime illumination for all uses on and related to the site, including, but not limited to, pedestrian pathways, plazas, courtyards, building entrances, parking and driveway areas, automatic teller machines (ATMs), and other outdoor spaces commonly used at night. Lighting of exterior areas shall reduce conflicts between building design and landscape treatments, provide appropriate surveillance for crime prevention, and minimize glare or intrusive light onto adjoining properties and into the night sky.
(B) Illumination Levels. The maximum illumination level for any on-site lighting should not exceed 30 lux or three foot-candles when measured at grade. When adjacent to or for residential uses the maximum illumination levels should not exceed ten lux or one foot-candle. Refer to the specific regulations herein for the different kinds of community lighting standards and to SLCC 18.85.070 for exceptions and/or waivers.
(C) Light Trespass. All outdoor light fixtures, unless otherwise stated in this title, shall be directed downward and properly aimed on the targeted areas to maximize their effectiveness and minimize the total number of lighting fixtures necessary. Outdoor light fixtures shall be directed away from any residential property and shall not detract from driver visibility on adjacent streets. Spill light from any fixture shall be minimized and shall not spill beyond the property line on which the fixture is located. In all cases the illumination levels should not exceed one lux (0.1 fc) at the property line when measured at grade.
(D) Shielding. All outdoor light fixtures, unless otherwise stated in this title, shall be fully or partially shielded as denoted in Table No. 18 of this section. Refer to SLCC 18.85.070 for exceptions and/or waivers. Light sources that must be shielded shall be shielded in a manner that the bulb or light source from the fixture is not visible from an adjoining property or from the street view when viewed horizontally to the fixture.
(E) Preferred Light Source. Low pressure sodium lamps are the preferred light source for minimizing adverse effects on astronomical observations. However, other light sources as outlined in Table No. 18 that are more energy efficient are also permitted.
Fixture Lamp Type | Shielding Requirements(4) |
|---|---|
Low pressure sodium(1) | Partially shielded |
High pressure sodium | Fully shielded |
Metal halide/warm halide(6) | Fully shielded |
Fully shielded | |
Quartz(3) | Fully shielded |
Incandescent, greater than 75 watts | Fully shielded |
Incandescent, 75 watts or less | Partially shielded |
Fossil fuel | None |
Neon, argon, krypton; in glass tubes(5) | None |
Induction lighting | Fully shielded |
Other lamp types(4) | As approved by the City |
Footnotes:
(1)This is a preferable lamp type to minimize undesirable light into the night sky affecting astronomical observations.
(2)Warm, white and natural lamps are preferred to minimize detrimental effects.
(3)For the purpose of this title, quartz lamps/quartz halogens shall not be considered an incandescent light source.
(4)Or current Illuminating Engineering Society of North America (IESNA) guidelines, whichever is more restrictive.
(5)Permitted only in commercial zoning districts; prohibited in all residential zones.
(6)Metal halide lighting used for display purposes shall not be used for security lighting after 11:00 p.m. Metal halides shall be installed only in enclosed luminaires. These lamp fixtures shall be “filtered” by glass, acrylic or translucent enclosure of the light source (clear quartz glass does not meet this requirement). Only pulse start metal halides can now be used in Arizona.
(7)Outdoor advertising signs of this type constructed of translucent materials and wholly illuminated from within do not require shielding.
(Ord. 312 § 2(17.3), passed 4-11-2012. Code 2012 § 152.278.)