Share to Facebook Share to Twitter Bookmark and Share
File #: BL2020-535    Name:
Type: Bill (Ordinance) Status: Passed
File created: 11/10/2020 In control: Metropolitan Council
On agenda: 4/6/2021 Final action: 4/6/2021
Title: An ordinance amending Titles 16 and 17 of the Metropolitan Code of Laws regarding the design and operation of outdoor electrical lighting to achieve light pollution reduction consistent with International Dark Sky Association guidelines (Proposal No. 2020Z-014TX-001).
Sponsors: Burkley Allen, Ginny Welsch, Freddie OConnell, Kathleen Murphy, Russ Bradford, Tonya Hancock, Joy Styles, Angie Henderson
Attachments: 1. BL2020-535 Substitute, 2. BL2020-535 Amendment 1, 3. BL2020-535 Amendment 2
Date Action ByActionAction DetailsMeeting DetailsVideo
4/9/2021 Metropolitan Council effective Action details Meeting details Not available
4/7/2021 Mayor approved Action details Meeting details Not available
4/6/2021 Metropolitan Council passed on third reading as amended Action details Meeting details Video Video
4/6/2021 Codes, Fair, and Farmers Market Committee approved with an amendment Action details Meeting details Not available
4/5/2021 Planning and Zoning Committee approved with an amendment Action details Meeting details Not available
3/16/2021 Metropolitan Council deferred Action details Meeting details Video Video
3/2/2021 Metropolitan Council passed on second reading as amended Action details Meeting details Video Video
3/2/2021 Metropolitan Council substituted Action details Meeting details Not available
3/2/2021 Metropolitan Council amended Action details Meeting details Not available
2/25/2021 Planning Commission approved with a substitute Action details Meeting details Not available
2/2/2021 Metropolitan Council deferred Action details Meeting details Video Video
2/2/2021 Metropolitan Council public hearing Action details Meeting details Not available
1/8/2021 Metropolitan Council advertised Action details Meeting details Not available
11/17/2020 Metropolitan Council deferred to Action details Meeting details Not available
11/17/2020 Metropolitan Council passed on first reading Action details Meeting details Not available
11/10/2020 Metropolitan Council filed Action details Meeting details Not available

title

An ordinance amending Titles 16 and 17 of the Metropolitan Code of Laws regarding the design and operation of outdoor electrical lighting to achieve light pollution reduction consistent with International Dark Sky Association guidelines (Proposal No. 2020Z-014TX-001).

 

body

WHEREAS, although artificial lighting has enabled people to be productive around the clock and has provided many benefits to civilization, an unfortunate side effect of artificial lighting is light pollution, which can have multiple negative consequences if not minimized; and

 

WHEREAS, light pollution of adjacent properties or of the night sky results from using too much light, directing it where it is not needed, or using it when it is not needed; and

 

WHEREAS, light pollution in the U.S. is estimated to waste up to 35% of the energy used for outdoor lighting, enough to power two cities the size of New York, resulting in five million tons of greenhouse gas being emitted into the air unnecessarily, costing three billion dollars in wasted energy, and squandering limited energy resources; and

 

WHEREAS, light pollution has significant environmental effects, including the alteration of the circadian rhythms of many animals and insects who depend on the natural light / dark cycle of day and night and the disruption of seasonal cycles used by migrating birds, sea turtles, and many other animals; and

 

WHEREAS, research suggests that artificial light at night can negatively affect human health, increasing risks for obesity, depression, sleep disorders, diabetes, breast cancer and more; and

 

WHEREAS, light pollution reduces the ability to see the constellations of the night sky, an invaluable source of wonder and curiosity, diminishing the opportunity to draw our children into fascination with Science Technology, Engineering, and Math (STEM) education; and

 

WHEREAS, the Livable Nashville Committee was convened in 2016 to develop a vision for protecting and enhancing Nashville’s livability and environmental quality, and one of the committee’s general recommendations was to structure the Metro Code and its enforcing Department around achieving sustainability goals; and

 

WHEREAS, among the specific recommendations of the Livable Nashville Committee was (1) the conversion of all street lights within the Urban Services District to LED to meet the International Dark-Sky Association’s guidelines; and (2) the conversion of all traffic lights to LED by 2020; and

 

WHEREAS, the Mayor’s Sustainability Advisory Committee has been convened to advise and support the City’s commitment to develop a Climate Action and to provide advice on a range of sustainability issues with a goal of  tackling climate change and driving urban action that reduces greenhouse gas emissions; and the energy savings from Dark Skies lighting design are consistent with these goals.

 

NOW THEREFORE, BE IT ENACTED BY THE COUNCIL FOROF THE METROPOLITAN GOVERNMENT OF NASHVILLE AND DAVIDSON COUNTY:

 

Section 1. That Section 16.20.150 of the Metropolitan Code of Laws is hereby amended by adding subsections 16.20.150(T) and 16.20.150(U) as follows:

 

(T) Article 410.10 of the 2017 Edition of the National Electrical Code is amended by adding the following Section G:

 

Parking Lots - Open parking lots shall use luminaires with a “U” BUG rating (Backlight Uplighting Glare) of 0 without external shields. Luminaires shall have a Correlated Color Temperature (CCT) of 3000 Kelvin or below.  Principal walkways and parking shall have a maintained minimum illuminance of 0.2 foot-candles at grade.  The average light level is not to exceed the average lighting levels set forth in the table below, as related to the Transect Category for the site as designated in the Community Plans of NashvilleNext.  Spill light at the property line shall not exceed 0.5 foot-candles measured at 3’ above grade.  Exception may be given for calculation points on the drive between the parking lot and roadway only.  Luminaires shall be controlled by occupancy sensor or timers after business hours or between the hours of 12 a.m. to 6 a.m., at a minimum.  Occupancy sensors or timers may turn lights off or dim by at least 30% during periods of no occupancy.  Prior to installation, a photometric plan shall be reviewed by a certifying engineer with calculation points on a 10’ X 10’ grid.

 

Transect Category

Average Lighting Level

T1 Natural, T2 Rural

0.8 foot-candles at grade

T-3 Suburban

1.25 foot-candles at grade

T4 Urban, T-5 Center, T-6 Downtown

1.5 foot-candles at grade

 

Section 2. That Section 17.28.100 shall be deleted in its entirety and replaced as follows:

 

17.28.100 - Lighting.

 

A. Definitions Specific to this Section.

 

When used in this chapter, the following words and terms shall have the meanings ascribed to them in this section. In the event of a conflict between a definition in this section and section 17.04.060, the definition in this section will control.

 

“Ambient lighting” means the general overall level of lighting in an area.

 

“Architectural lighting means outdoor lighting directed at buildings, facades, structures, monuments, and other architectural features.

 

“Canopy” means a roofed structure with at least one side open for pedestrian and/or vehicle access that typically provides protection from the sun or weather and is associated with providing goods or services.

 

“Commercial” means any lot, however zoned, in any zoning district that does not have as its primary use a single-family or two-family residential dwelling or land used for agricultural purposes.

 

“Correlated color temperature (CCT)” means measured in degrees Kelvin (K), the absolute temperature of a blackbody whose chromaticity most nearly resembles that of the light source. For the purpose of this section, "CCT" is used as a simplified way to characterize the spectral properties of a light source and estimate the overall appearance of the light to the human eye.

 

“Floodlight” means a light designed for lighting a scene or object to a luminance greater than its surroundings.

 

“Foot-candle” means a unit of measure of illuminance equal to one lumen of light spread over an area of one square foot.

 

“Full cutoff luminaire” means a luminaire having zero intensity at or above horizontal (90°) and limited to a value not exceeding ten percent (10%) of lamp lumens at or above eighty degrees (80°). Such luminaire is determined by a photometric test and certified by the manufacturer. See diagram below: