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Lone Tree City Zoning Code

ARTICLE XXX

Lighting Standards

Sec. 16-30-10.- Intent.

The purpose of this Article is to provide lighting standards that prevent motorized vehicle and pedestrian conflicts, provide personal safety and protection against assault, theft and vandalism; provide convenience and comfort levels to the users of sites, and that minimize the negative effects of light pollution and trespass on surrounding land uses.

(Ord. 22-02 Art. 4)

Sec. 16-30-20. - Lighting standards.

All outdoor lighting shall meet the following standards:

(1)

External lighting shall be shielded such that the source of illumination (bulb or direct lamp image) is not visible from any adjacent property, except for Director-approved limited decorative lighting, approved streetscape lighting or as otherwise provided herein.

(2)

For residential land and for land requiring Site Improvement Plan review, floodlights may only be used where there is external shielding and provided that light levels measured twenty (20) feet beyond the site's property line (adjacent to residential or public right-of-way) shall not exceed 0.1 foot-candles as a direct result of on-site lighting. All landowners have ninety (90) days within the date of approval of these amendments to come into conformance with this regulation or the property owner will be put on notice to redirect, shield, remove or replace such lighting. The use of directional shielding and photocells with timers that allow floodlights to go on at dusk and off by 11:00 p.m. are encouraged.

(3)

Except as otherwise allowed for herein, all lighting (including, but not limited to street, parking lot, security, walkway and building) shall conform with the Illuminating Engineers Society of North America (IESNA) criteria for full cutoff fixtures. No portion of the bulb or direct lamp image may be visible beyond two (2) mounting heights from the fixture. If the bulb position within a fixture is vertical, any or all of the following may be required:

a.

A high socket mount;

b.

A translucent fixture lens;

c.

An opaque coating or shield on a portion of the perimeter of the lens; or

d.

Other industry-accepted measures, to ensure that the fixture IES classification as a true cutoff is not compromised.

(4)

All lights must be retrofitted with shielding in a manner such that the light conforms with IES criteria for true cutoff fixtures as noted in Paragraph (3) above.

(5)

All lights, except those required for security as provided herein, must be extinguished within one (1) hour after the end of business hours and remain extinguished until one (1) hour prior to the commencement of business hours. For reasons of security, one and one-half (1.5) foot-candles at entrances, stairways and loading docks, and one-half (0.5) foot-candle on the rest of the site is permitted.

(6)

Lights which are mounted on the ground or poles for the purpose of illuminating the building facade are prohibited, unless otherwise approved through the Site Improvement Plan process.

(7)

Non-IES-approved cutoff fixtures which use incandescent bulbs of one hundred fifty (150) watts or less may be permitted to illuminate landscape plantings, pedestrian walkways, signage or product display areas. All signage lighting shall be extinguished within one (1) hour of the end of business hours and remain extinguished until one (1) hour prior to commencement of business hours.

(8)

Blinking, flashing or changing intensity lights and lighted signs shall be prohibited, except for temporary holiday displays or lighting required by the FAA for air traffic control and warning purposes.

(9)

No outdoor lighting may be used in any manner that could interfere with the safe movement of motor vehicles on public thoroughfares. The following is prohibited:

a.

Any fixed light not designed for roadway illumination that produces incident or reflected light that could be disturbing to the operator of a motor vehicle.

b.

Any light that may be confused with or construed as a traffic control device, except as authorized by a state, federal or city government.

(10)

No beacon or searchlight shall be installed, illuminated or maintained.

(11)

All stadium and all other exterior sports arena lights used for the purpose of illumination of the playing area must be extinguished by 10:00 p.m. or immediately after the conclusion of the final event of the day. The remainder of the facility lighting, except for reasons of security, must be extinguished at 10:00 p.m. or within one (1) hour after the event, whichever is later, and remain extinguished until one (1) hour prior to the commencement of the next event. For reasons of security, however, a maximum level of one and one-half (1.5) foot-candles at entrances and stairways and one-half (0.5) foot-candle on the rest of the site is permitted.

(12)

Maximum fixture height for all lighting shall be:

a.

Twenty-four (24) feet when the fixture is located within seventy-five (75) feet of the site's boundary; and

b.

Forty (40) feet when the fixture is located beyond seventy-five (75) feet from the site's boundary, provided that, for mounting heights in excess of twenty-four (24) feet, the distance of the fixture to the site's boundary is not less than three (3) times the mounting height.

(13)

All fixtures mounted within fifteen (15) feet of any residential property line or public right-of-way boundary of the site shall be classified as IES Type III or Type F (asymmetric forward throw) and shall be fitted with a "house side shielding" reflector on the side facing the residential or public right-of-way property line.

(14)

Acceptable bulb types:

a.

High pressure sodium;

b.

Metal halide (coated preferred);

c.

Incandescent.

(15)

Maximum on-site foot-candles shall not exceed the following and may be reduced if adjacent to residential or other similar sensitive-type land use:

a.

Ten (10) foot-candles in areas adjacent to building entryways. Said ten-foot-candle maximum shall include light spillage from within the building as well as light from signage.

b.

Three (3) foot-candles for parking lot areas.

c.

Ten (10) to thirty-five (35) foot-candles for special display areas associated with such uses as auto sales.

d.

Thirty (30) foot-candles under canopies of service stations or similar approved uses.

Exceptions may be granted for the lighting of monument or other signs which enhance the City's identity or image.

(16)

Light levels measured twenty (20) feet beyond the site's property line (adjacent to residential or public right-of-way) shall never exceed one-tenth (0.1) foot-candle as a direct result of the on-site lighting.

(17)

All project lighting must receive final administrative approval, including illumination levels and types of fixtures, prior to issuance of a certificate of occupancy. Any unsatisfactory lights must be further shielded, reduced or increased in intensity, or removed.

(Ord. 22-02 Art. 4)

Sec. 16-30-30. - Indoor lighting.

For land requiring Site Improvement Plan review, internal lighting shall be shielded such that the source of illumination (bulb) is not visible from any adjacent property, except for Director-approved limited decorative lighting or as otherwise provided herein.

(Ord. 22-02 Art. 4)