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A. General Standards:
1. Exterior Lighting: All exterior lighting shall be designed, located and lamped in order to prevent or minimize:
a. Over lighting;
b. Energy waste;
d. Light trespass;
e. Sky glow.
2. Light Curfews: After eleven o’clock (11:00) p.m., lights must be dimmed by at least thirty percent (30%) or extinguished. Lights on a timer are encouraged. Sensor activated lights are encouraged to replace existing lighting that is desired for security purposes.
a. Commercial and industrial lighting shall be turned off within thirty (30) minutes of close of business, except that lighting within forty feet (40’) of a building, outside display areas, or other areas requiring security lighting shall not exceed two (2) initial lumens per square foot.
b. Lighting for signage, except monument signs, shall be turned off thirty (30) minutes after the close of business.
c. Sports lighting shall be turned off by eleven o'clock (11:00) p.m., except to conclude a specific sporting event that is underway.
d. Residential lighting above eight hundred (800) lumens shall be turned off after eleven o'clock (11:00) p.m.
e. Exceptions: Lighting reductions are not required for any of the following:
(1) With the exception of landscape lighting, lighting for residential properties including multiple residential properties not having common areas.
(2) When the outdoor lighting consists of only one luminaire.
(3) Code required lighting for steps, stairs, walkways, and building entrances.
(4) When in the opinion of the authority, lighting levels must be maintained.
(5) Motion activated lighting.
(6) Lighting governed by special use permit in which times of operation are specifically identified.
(7) Businesses that operate on a twenty four (24)-hour basis.
3. Canopy Lights: Canopy lights, such as service station lighting or covered entries, shall be fully recessed or fully shielded so as to ensure that no light source is visible from or causes glare on public rights of way or adjacent properties.
4. Area Lights: All area lights shall be a minimum eighty five degree (85º) full cutoff type luminaire.
5. Color: Warm lighting colors are strongly recommended. The blue-white colors of metal halide and mercury vapor lamps are generally prohibited. Twenty seven hundred (2700) Kelvin color temperature is mandatory for new construction.
6. Luminaires: Rocky Mountain Power shall not install any luminaires after the effective date hereof that lights the public right of way without first receiving approval for any such application by the lighting administrator.
7. Hillsides, Ridgelines, And Special Cases: In certain cases (such as, but not limited to, properties on or near ridgelines or hillsides), additional shielding may be required to mitigate glare or light trespass. The need for additional shielding will be considered as part of the building permit review process.
a. All monopole, antenna, tower or support facility lighting not required by the federal aviation administration (FAA) or the federal communications commission (FCC) is prohibited.
b. When lighting is required by the FAA or the FCC, such lighting shall not exceed the minimum requirements of those agencies. Collision markers should have a dual mode for day and night to minimize impact to the night sky and migrating birds.
c. All other lighting used on the property not regulated by the FAA or FCC shall conform to this chapter.
B. Use of Luminaires: No unshielded or clear glass luminaires shall be allowed; all exterior lighting shall be full cutoff luminaires with the light source downcast and fully shielded, with the following exceptions:
1. Luminaires: Luminaires that have a maximum output of one thousand (1,000) lumens per fixture (equal to one sixty (60)-watt incandescent lamp) regardless of number of lamps, may be partially shielded, provided the luminaire has an opaque top or is under a solid overhang.
2. Floodlights: Floodlights with external shielding shall be angled; provided, that no light is directed above a thirty degree (30º) angle measured from the vertical line from the center of the light extended to the ground, and only if the luminaires do not cause glare or light to shine on adjacent property or public rights of way. Residential floodlights must be turned off by eleven o'clock (11:00) p.m.
3. Residential Holiday Lighting: Temporary lighting and seasonal lighting provided that individual lamps are less than ten (10) watts and seventy (70) lumens. Flashing holiday lights on residential properties are discouraged. Holiday lights shall be turned off by eleven o'clock (11:00) p.m.
4. Commercial Holiday Lighting: Flashing holiday lights are prohibited. Commercial holiday lights shall be turned off by eleven o'clock (11:00) p.m. or the close of business, whichever is later.
5. Sensor Activated Luminaires: Sensor activated luminaires, provided:
a. It is located in such a manner as to prevent glare and light trespass onto properties of others or into a public right of way;
b. The luminaire is set to only go on when activated and to go off within five (5) minutes after activation has ceased;
c. The luminaire shall not be triggered by activity off the subject property.
6. Emergency Lighting: All temporary emergency lighting needed by the fire and police departments, or other emergency services.
7. Lighting Of Flags: Provided the flag is a United States Of America or state of Utah official flag and the maximum lumen output is one thousand three hundred (1300) lumens. Flags may be taken down at sunset to avoid the need for lighting. The external beam shall minimize light trespass and/or glare.
8. Landscape Lighting: The primary function of landscape lighting is to provide illumination for pathways, steps, and entrances to buildings.
a. Pathway Lighting: The intent of pathway lights is to provide pools of light to help direct pedestrians along the path, not to fully illuminate the path. Steps and path intersections should be illuminated for safety. The maximum foot-candle permitted on the ground is one horizontal foot-candle or less. Two (2) types of lights may be selected: three and one-half foot (3’6”) bollards with louvers or ten foot (10') pole mounted down directed luminaires. Lights must be shielded.
b. Highlighting, Backlighting: Only low voltage systems are permitted. Lights must be partially shielded and light must not be directed off the property being lighted. A maximum foot-candle permitted at ten feet (10') is 0.6 horizontal foot-candles from the light source. Uplighting is prohibited except where demonstrated to be nonpolluting at a power density of twenty (20) watts per ten (10) square feet of landscape area.
The lighting of vegetation and other landscape features shall comply with the regulations this chapter.
9. Trails: Trails lighting shall be low level bollards (below eye level where possible), shielded, and designed to meet all requirements established in this chapter and in accordance with the "Standard Specifications For Design And Construction". Bollards shall not be necessary where a trail is within one hundred feet (100') of a streetlight. Other low level lighting alternatives shall be considered during the development process on a case by case basis.
10. Uplighting: Uplighting for landscaping and/or structures shall be fully captured for approval. All uplighting shall be turned off by eleven o'clock (11:00) p.m.
11. Lighting Of Towers: Lighting of radio, communication and navigation towers, provided the owner or occupant demonstrates that the federal aviation administration (FAA) regulations can only be met through the use of lighting that does not comply with this chapter.
12. Neon Lights: See subsection 10-22-5 C3 of this title.
13. Playing Field Luminaires: Luminaires used for playing fields and courts shall be exempt from the height restriction, provided all other provisions of this chapter are met and the light is used only while the field or court is in use. In no case shall the lights be used later than eleven o'clock (11.00) p.m. without prior approval.
14. Nonresidential Luminaires: Nonresidential luminaires may deviate from the requirements of these exterior lighting regulations only upon submitting for planning commission approval a design review application, detailing the specific reasons for the proposed deviation. Such application may be granted only if the applicant demonstrates each of the following:
a. The proposed deviation is appropriate to the location of the lighting and the surrounding neighborhood;
b. The proposed deviation will not unreasonably diminish either the health, safety or welfare of the surrounding neighborhood uses; and
c. The proposed deviation will not unreasonably conflict with the general intent of these exterior lighting regulations.
The planning commission may approve, deny or approve with conditions any such application submitted under this subsection.
C. Placement And Height Of Luminaires:
1. Parking Lots:
a. Full Cutoff Fixtures: All lighting shall be full cutoff fixtures as defined by the Illuminating Engineering Society of North America (IESNA).
b. Appropriate Location: Entrances, exits, and barriers should be emphasized.
c. Integrate With Landscaping: All parking lot lighting should be integrated into landscape areas wherever possible.
d. Height: Height of parking area light poles should be in proportion to the building mass and height and no more than seventeen feet (17’) high.
e. Maximum: A maximum of two (2) initial lumens per square foot of parking lot surface is permitted.
f. Spot Or Flood Lighting Prohibited: Spot or flood lighting of parking lots from a building or other structure is not permitted.
g. Compliance Required: Parking lot lighting shall comply with all other requirements of this chapter.
2. Private Property In Residential Zones: Freestanding luminaires on private property in residential zones shall be mounted at a height no greater than twelve feet (12') from ground level to the top of the luminaires.
3. Arterial Roads: Streetlights used on arterial roads may exceed twenty feet (20') in height, with the recommendation by the city council, and only with a finding that exceeding twenty feet (20') is necessary to protect the safety of the residents of the city.
4. Illumination Of Rights Of Way. Lighting of public and private rights of way shall be fully shielded. In addition, lighting shall comply with source color temperature of this section.
a. Exception: Traffic signal indications.
b. Definitions: Right of way types:
Roadways serving traffic between major and local streets. These are streets used mainly for traffic movement within residential, commercial and industrial areas.
A divided major roadway for through traffic, with partial control of access and generally with interchanges at major crossroads.
Local streets are used primarily for direct access to residential, commercial, industrial, or other abutting property.
The part of the roadway system that serves as the principal network for the through traffic flow. The routes connect areas of principal traffic generation and important rural roadways leaving the city.
c. Illumination Levels Of Rights Of Way: The maximum average illumination level along the entire right of way being illuminated and over the right of way area only, shall be:
(1) Expressway. 1.4 foot-candles.
(2) Major roads: 1.5 foot-candles.
(3) Collector roads: 1.0 foot-candle.
(4) Local roads: 0.4 foot-candle.
(5) Existing luminaires on local roads may be retrofitted with full cutoff luminaires with the design not to exceed 0.4 foot-candle average. The maximum maintained average illumination in the intersection area shall be two (2) times the average of the maintained foot-candles of the two (2) types of roads at the intersections.
(6) Intersections of collector and local roads shall be 1.6 foot-candles maximum and at intersections of local and local roads shall be 1.4 foot-candles maximum.
5. Playing Fields: Luminaires used for playing fields shall be exempt from the height restriction, provided all other provisions of this chapter are met and the light is used only while the field is in use.
D. Luminance And Type Of Lamp:
1. Luminance levels for parking lots, sidewalks and other walkways affected by side mounted building lights, and freestanding sidewalk lights (not streetlights) shall not exceed luminance levels listed in the most current "IESNA Recommended Practices", as amended from time to time. The city recognizes that not every such area will require lighting.
2. Aboveground parking lot lighting shall not exceed an overall average illumination of 1.5 foot-candles. Interior parking structure lighting shall not exceed the minimum security illumination levels listed in the most current "ESNA Recommended Practices", as amended from time to time.
3. The use of lighting for exterior wall washing is limited for residences, condominiums and apartments; the use of recessed eave lighting to achieve wall washing is preferred, and wall washing should strive for uniform illumination distribution. The maximum average illumination limits for wall washing are:
a. Dark colored exterior surfaces: 1.0 foot-candle.
b. Light colored exterior surfaces: 0.5 foot-candle.
Luminance measurements of indirect light creating wall wash shall be measured with a luminance meter four feet (4') from ground level with the meter held horizontally and touching the wall surface.
4. Streetlights shall be LED, unless otherwise determined that another type is more efficient and approved by the City Council. LED street lighting shall be fully shielded, and emit no light upward. Light housing shall be constructed to expel excess heat from the fixture. The correlated color temperature on all fixtures shall be three thousand Kelvin (3000 K) or warmer (lower number). LED lighting fixtures shall be installed with an adaptive control system capable of dimming and/or motion sensor control that is compatible with the current city control system. If a light type other than LED is permitted, then the replacement fixture shall have the equivalent output as the other light type.
5. LED streetlights shall be implemented in accordance with an engineering study, specifically a photometric plan that shall have been conducted and approved prior to installation of LED luminaires. Said photometric plan shall recommend appropriate perceived levels of illumination based upon the correlated color temperature of the proposed luminaires and the specific location and purpose of the luminaire, e.g., residential cul-de-sac, highway intersection, etc., as referenced in "IESNA Recommended Practices"
6. Exempt Lighting: The following lighting shall be exempt from the provisions of this chapter:
a. Holiday lighting, as long as it does not create a hazard or nuisance from glare.
b. Traffic control signals and devices.
c. Temporary emergency lighting in use by law enforcement or government agencies or their direction.
d. Temporary lighting, used for a period not to exceed thirty (30) days in any one year period for festivals, celebrations, or other public activities.
e. Security lighting controlled by a motion sensor switch that remains on for no longer than ten (10) minutes after activation, but shall in all cases be shielded and directed to the areas where such lighting is required.
f. Temporary construction lighting used for a period not to exceed thirty (30) days in any one-year period.
7. Prohibited Lighting: The following lighting shall be prohibited:
a. Unshielded Lighting: Unshielded lighting for any purpose is prohibited.
b. Flashing, Blinking, Intermittent Lights: Flashing, blinking, intermittent lights or other lights that move or give the impression of movement is prohibited. Holiday lighting is permitted.
c. Building Mounted Lights Under Most Conditions: Spotlights may not be affixed to buildings for the purpose of lighting parking lots or sales display lot areas. Fully shielded fixtures may be attached to buildings to light walkways and parking lot spaces adjacent to buildings.
d. Laser Lighting: All laser lighting is prohibited.
e. Searchlights: All searchlights are prohibited.
f. Neon: All neon lighting must be shielded.
g. Linear Fluorescent Lamps: Generally not allowed. (Ord. 2017.02, 4-13-2017; amd. Ord. 2020.06, 2-13-2020)