The document discusses replacing high pressure sodium street lights with LED lights in Evansville, Indiana. It notes that cities like Raleigh, NC have seen energy savings of 42-62% by making this switch. Replacing Evansville's 14,901 high pressure sodium fixtures with LEDs could save the city $1.26 million per year in energy and maintenance costs. The document recommends that Evansville launch a pilot program replacing lights downtown and work with manufacturers to develop new LED fixtures that meet standards for lighting quality and performance. This switch would help Evansville reduce costs and energy usage in line with its sustainability goals.
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3. INTRODUCTION
Cities across the nation are desperately searching for op- Recently Raleigh, North Carolina was issued as the
portunities to reduce financial spending that contributes Nation’s Most Sustainable mid size community and has
to the ever-growing debt in America. Areas such as Jef- set a standard on how other U.S. cities can follow suit.
ferson County Alabama and Stockton California are de- Raleigh’s most recognizable accomplishments occurred
claring bankruptcy due to the ineffiencey to cut spend- with the initiative to replace High Pressure sodium
ing and make innovative decisions to create economic street lights to Light emitting diodes. Since launching
growth. On October 20, 2007 the mayor of Evansville the pilot program the city of Raleigh has seen $225,000
signed a declaration and an executive order to uphold in savings and $175,000 in energy savings. Currently
the United States. Mayors Climate Protection Agreement in the cities across the United States, predominantly
that protects the welfare of Evansville citizens. With most cities use High Pressure Sodium (HPS) lamps to
this commitment the City of Evansville currently should illuminate streets and public areas. High Pressure
be actively searching for means to “reduce emissions Sodium bulbs are extremely cheap and cost at an
of harmful pollutants, conserve energy/improve energy average $15-$18 for replacement bulbs. This specific
efficiency, and reduce public and energy costs.” Cur- type of bulb has a lifespan of three to five years and
rently the city has valiant steps to decrease high levels they provided an equal amount of light for each amount
of dangerous air quality, developing sustainable building of energy consumed. Also High Pressure Sodium bulbs are
structures, and using cost efficient vehicles. made with xenon gas and mercury which is needed to
operate.
In comparison Light emitting diodes is an excellent
alternative for street lighting and reduces the energy
consumption by 42% -62%. The lifespan for Light emitting
diodes range from twelve to fifteen years, which reduces
the amount of maintenance, needed. Another of the
major benefits of Light emitting diodes is option for
output to begin instantly and is dimmable.
5. http://www.cityofredlands.org/sites/
default/files/pdfs/MUED/StreetLightin-
gUpgradeProgram2.pdf
With replacing High Pressure Sodium bulbs with Light Emitting Diodes will be a very beneficial and lucrative change for
the City of Evansville. As a model, the city can use Raleigh, North Carolina’s approach in implementing a pilot program
that will eventually evolve in a realistic overhaul in creating a more sustainable environment for the City of Evansville.
By replacing the High Pressure Sodium with Light Emitting Diodes bulbs will abide by three of the seven points outlined in
the City of Evansville’s Sustainable Policy that instructs for local government to take provisions to action by:’
1. Protecting the health and welfare of Evansville residents, reducing the negative impacts of human activity on the
environment and maintain a competitive diversified economy.
2. Established and enforce municipal policies and ordinances so as to reduce emission of harmful pollutants, conserve
energy/improve energy efficiency and reduce public and private energy costs.
3. …Reduced consumption of energy from non-renewable sources, green space preservation, healthier urban forests,
reduced traffic congestion, …reduced emission fo global warming pollutants, and economic development and job
creation though energy conservation and emerging technologies.
7. The City of Raleigh launched its pilot LED program in a municipal four level garage that
was constructed with High Pressure Sodium fixtures that contained predominantly 100-
watt bulbs. Level three was choose to launch the project that is a high traffic area due
to the use by the public and light fixtures burn for twenty-four hours. Each fixture was
High Pressure Sodium fixture was replaced with a LED fixture by the Lighting Science
Group that allows for easy installation. Initial results show that there was a 40% decrease
in power consumption in the garage, which calculated to each fixture, saved 50W of
electricity for the 141 HPS bulbs it replaced. The projected reduction in electricity
amounted for the third level of the garage calculated to 128 kWh per day/ 46.720kWh per
year. The results where calculated four years after installation in which technology has
surpassed the current LED lights that are offered now. If these same LED’s were replaced
with current fixtures that are available on the market currently the garage could see
savings of 82,000 kWh per year.
8. The City perception of the quality of light by the public was of particular importance in relevance to the garage.
Pedestrians noticed the ability to recognize the color of objects and figures where affect by the light. The LED light
fixtures performed highly with an 11% increase in foot candles (The unit is defined as the amount of illumination the
inside surface of a 1 foot radius sphere would be receiving if there were a uniform point source of one canela the
exact center of the sphere). The security of for the garage RMA did a video comparison of the quality of lighting in
surveillance cameras and state that “video…shows parking areas well lit with the usual yellow/orange cast from the
lights….leaves shadow areas where individuals can hide and ay in wait to perpetuate criminal activity.” Where the
security guard staes that with the new lighting “sufficient lighting to positively identify a face and read body language at
a distance of 30 feet.”
Prior to implementation of the new fixtures the city already had a preconceived notion that they would be placed in a
position to buy new fixtures. The quote given to the city for the 141 LED lights in the garage listed at $450 per fixture
and $150 for using HID light source which totaled to $42,300.
11. The most rigorous phase of the Call to Action has already been completed with the declaration of the previous mayor
signing for current and future governments to make an effort for a sustainable environment for its community. To stay
diplomatic approval will still be need from Evansville City Council. Approval from the city council will allow for any funds
that need to be allocated to the project to be systematically approved. In 2010, Evansville was awarded $1.2 million
from the United States Department of Energy, Energy Efficiency and Conversation Block Grant. This grant was awarded
for the use to reduce energy and fossil fuel emission and to improve energy effiecncy for the city. As stated in the grant
“Energy efficient traffic signals and street lighting” will be an eligible usage for those funds. A perfect place to start the
first pilot program of the HPS fixtures to LED fixtures will be in downtown Evansville on Main St. This area has always
been a focus landmark to develop business and create a lucrative tourism for Evansville.
A baseline study of where the pilot program will begin should be the first issue that the city will need to discuss. The
city has many subcommittees that specialize in this area of study that can take executive command of leading this
initiative such as Keep Evansville Beautiful, The Evansville Department of Metropolitan Development, and the Evansville-
Vanderburgh Area Plan Commission. These committees will need to develop recommendations on specific standards that
follow IES and ASHTO policies on street lighting such as LED glare and clarity issues. The recommendations will extend
for ordinances that cover neighborhood street lighting to business district street lighting. Each mentioned committee will
handle specific areas that will develop information needed to create a plan to eventually replace all HPS bulbs with LED
Fixtures.
http://www.riffert-riverview-studio.
com/img/s11/v34/p880924250-5.jpg
12. 1. Evansville-Vanderburgh Area Plan Commission- The APC specializes in long range planning for future development,
community growth, and assist with data analysis.
2. Evansville Metropolitan Planning Organization- Is in charge of community sustainability, which involves reviewing
development plans, impact analysis, and pedestrian facilities.
3. Keep Evansville Beautiful- Will ensure the aesthics of the city of Evansville stays true to its historic value. Which can
also handle prior to officially installing the LED fixtures, local business need to be educated on how to replace current
light signs, window treatments, and other illumination products that can coincide with LED products.
13. With the new standards set for the proper luminance that will be needed, the city will need to work directly with LED
manufactures to develop means of a cost productive avenue to design new fixtures or use the current fixtures to use
as the pilot test. The LED manufacture will use the standards set by the committees to ensure that the proper aesthic
lighting (such as pink for Breast Cancer awareness or other events) and performance is upheld in field-testing. A cross-
field analysis of all LED providers need to include pricing, maintenance, projected lifespan of appliance, and installation.
A recommendation for a streetlight that will more than likely fit the various needs of the city is the DMX LED Street light
LUI model. The model comes with a 36 month warranty that includes a life span of >50,000 hours. The LED uses 7W and
is designed especially for road lighting that reduces light pollution. Compared to HPS bulbs that essentially takes ten
minutes to warm up at full power, the DMX fixture takes only a merely 2 seconds. For special occasions the bulb also has
the option to change its color if needed for events such as Breast Cancer Awareness month. More important than all the
DMX LED bulb consists of no lead, mercury, nor causes any direct environmental pollution, and if the fixture works for 10
hours in a day can last for 13 years.
15. The city of Evansville has a great opportunity to make a tremendous impact on its community, citizens, economy, and
environment. In the month of September, the City of Evansville electric bill totaled to $181,755.40 for 14, 901 HPS light
fixtures, which accounts for approx. $2.1 million a year. Cities such as Raleigh (NC), Valdez (AK), and Austin (TX) pay
for the maintenance and electricity of their fixtures just as the City of Evansville do. These cities notice an average
of 42% to 62% reduction of overall energy cost directly from their streetlights. If Evansville is able to implement the
LED program based upon previous states numbers, the city will save $1.26 million a year. There will be an high initial
cost to installing LED’s but is highly inexpensive in comparison to maintenance needed for 10 yrs of HPS fixtures. After
initial installation and maintenance of LED in has a financial advantage over HPS lighting fixtures in a span of over 10 yrs
which essentially is the average payout period. The financial gains received over a period of ten years associated from
displacing HPS fixtures can allow for funds to be allocated towards initiatives that are in desperate need such as road
construction, job creation, and education.
http://www.cityofredlands.org/sites/
default/files/pdfs/MUED/StreetLightin-
gUpgradeProgram2.pdf