Webinar on street lighting: LEDs, networks: Thursday March 9th
Many cities are considering the conversion of their lighting infrastructure to LED lighting and sensor-based networks to reduce costs and add capabilities. LED lighting allows for more even lighting at half the cost of the current technology.
Because lighting involves a cost stream (payments for electricity), it's possible to use private financing (frequently called a "public private partnership") to pay for the capital costs of the conversion. At the same time, many cities are looking to off-load the management and operations of the lighting infrastructure in a long term deal.
-- Smart Lighting: The Gateway to a Smarter City, Sensus
-- Smart Outdoor Lighting Alliance
-- "Business case for smart street lighting," Silver Spring Networks
-- the TALQ Consortium "aims to set a globally accepted standard for management software interfaces to control and monitor heterogeneous outdoor lighting networks"
-- "San Diego installing 'Smart City' network with sensors on 3,200 streetlights," Times of San Diego
Along with the ability to calibrate lighting in a more localized fashion and with online monitoring of system uptime and individual outages, LED sensor-based lighting networks can integrate other capabilities can be added, ranging from free wifi connectivity to Shot Spotters to detect gunshots.
Marketplace did a story ("Chicago puts sensors to work taking its vitals") on a test underway in Chicago on the use of streetlight-based sensor networks, which they call the Array of Things. For example, sensors at intersections can record every traffic accident. From the story:
The city, in partnership with the University of Chicago and the Argonne National Laboratory, recently began constructing the Array of Things — a network of 500 data sensors that will track the city's vitals.DC is one of the cities with a process underway for doing the conversion. Although at this point, it's at the "Request for Expressions of Interest" stage, and it will probably be a 3-4 year process of information gathering, putting out a tender, selecting a contractor, and starting the conversion.
Perched on traffic signal poles, its sensors will monitor things like traffic flow, pedestrian traffic and air quality. The Array of Things is funded largely by a $3.1 million grant from the National Science Foundation, and is set to be fully installed by 2018.
-- DC Launches Smart Lighting Project
-- Streetlight Policy and Design Guidelines, DC Department of Transportation
AMA recommended guidelines for LED lighting specify a different light from the current industry standard. LED street lights are also in the news because typically, the industry standard for LED lighting for street lighting is 4000 Kelvin, but the American Medical Association recommends 2700 Kelvin ("Citing Health Concerns, Some Cities Consider Dimmer LED Streetlights," Stateline), and the industry hasn't settled on a lighting solution that puts out that frequency of light while balancing cost and longevity of the fixtures. However, some cities appear to have found lighting solutions that meet the AMA guidelines.
Most cities don't have lighting master plans. Ideally, the conversion of the city's street lighting network would have been preceded by the creation of a lighting master plan ("Lighting as an element of urban design and community identity: Cleveland chandelier + Chicago lighting design framework plan design competition," 2014), which could have prioritized lighting in terms of sustainable mobility.
But lighting from the standpoint of a master planning process is more complicated. For example, the Eindhoven Lighting Master Plan identifies six categories of lighting:
- urban lighting (streets, public areas)
- buildings and objects
- art (indoor and outdoor)
- events and festivals
On the other hand, some argue that such lighting is an element of urban vibrance and vitality. When DC had a more vibrant set of independent retail businesses, bright signage was an element of the identity of those businesses and the city's downtown business district.
F Street, Downtown Washington, 1950.
LUCI | Lighting Urban Community International is an international association of cities interested in lighting as an element of community identity.
Looking at neighborhood lighting issues more broadly. It happens I am on the "Public Works and Infrastructure" committee of my neighborhood commission, we have been dealing with the issue for a few months in a wide-ranging way.
Along with the LED issue that has been brought up by some residents, I have been pushing to identify lighting issues in primary pedestrian corridors and commercial districts and near schools and other civic assets (see "Night-time safety: rethinking lighting in the context of a walking community," 2014). Perhaps not surprisingly, it seems as if the city does not have a standard protocol for addressing this.
Part of the neighborhood is a historic district, which would justify the use of that light, but because we are in the Outer City, such lighting fixtures compete with the network of "telephone poles"--really they are electric utility poles--that line most streets. (On the major arterials, even in the Outer City, the infrastructure is placed behind the buildings and isn't visible from the main avenue.)
In Washington's "L'Enfant City"--the core of the city--overhead utility wiring is forbidden (with an exception for the streetcar wiring infrastructure on H Street/Benning Road NE) on the face blocks (typically telephone and cable utilities are strung from the interior of blocks, while the utility infrastructure for electricity is underground, the Washington Globe street light is standard.
In the outer city, where the more traditional wooden pole utility infrastructure is present, installing Washington Globes is difficult, even in a historic district, because the city doesn't want to have two different lighting systems up, and the cost to underground the utility infrastructure is exorbitant.
Rather than rely on the street-focused "cobra" light and in keeping with the city's historical and architectural identity, the city has added the "teardrop" light for use in these areas.
Even those these lights are still focused on motorists, by positioning the light fixture closer to the street, sidewalks also receive better light.
To provide even more lighting, mostly deployed in commercial districts, "sidearm" lighting has been added in some locations, placed at a height much closer to the sidewalks.
Sidearm sidewalk lighting using the teardrop fixture in the Brookland 12th Street NE commercial district.
However, separately, there is a program to underground certain utility infrastructure in the Outer City, to improve reliability and resiliency of the system in the face of weather events--for the most part, aesthetic concerns aren't a primary consideration.
-- DC PLUG (Power Line Undergrounding), Pepco
-- "$1 Billion project to move D.C. power lines underground to begin soon," WJLA-TV/ABC7
-- POWER LINE UNDERGROUNDING – Frequently Asked Questions, Office of the City Administrator, DC Government
American City & County Magazine is offering a webinar later in the week on LED street lighting, called "Will LED Street Lights Give Your City the Blues?" on Thursday, March 9, 2017 - 2PM ET / 11AM PT.
According to the webpage during this webinar, participants will:
- Review from a historical perspective, how outdoor LED luminaires have evolved from the early installations nearly a decade ago to the products of today with an emphasis on both economic need and the human experience.
- Examine the American Medical Association’s recommendations as it relates to community-based LED lighting and its concern with blue-rich light.
- Describe the many known benefits of LED lighting and its positive impact on communities.
- Identify LED streetlight implementation risks as it relates to the human experience and describe strategies that can help communities succeed in the eyes of their residents.