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Gwinnett County Public Schools
TWH LED Wallpack Luminaires

TWH LED Wallpack Luminaires
Energy savings, long life.

BEFORE

AFTER

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Project: Gwinnett County Public Schools, Georgia	

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Project Size: 39 luminaires installed at two schools

THE SITUATION
Every school system strives to create
secure and aesthetically pleasing
facilities for students, staff and visitors.
Gwinnett County Public Schools (GCPS)
– Georgia’s largest school system – is
also committed to excellence from an
operational standpoint, which involves
keeping its 132 schools and support
facilities safe, attractive and energy
efficient.
A recipient of the U.S. Department
of Education Green Ribbon Award,
GCPS decided to replace the 150and 250-watt high pressure sodium
(HPS) wallpack luminaires with LED
luminaires at two of its high schools.
The metro Atlanta area school district
had several goals: determine how well
the new luminaires illuminated the
space, observe how they looked on the
buildings, verify how long they lasted
and measure the energy savings.

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Product Used: TWH LED Wallpack Luminaires

Reduced maintenance was also
paramount. The school system has
an in-house maintenance staff that
routinely travels to school locations
to change failed lamps and ballasts.
Although the district has a preventive
maintenance program, GCPS personnel

“We piloted the use of LED
wallpacks at two facilities,
retrofitting 250- and 150watt high pressure sodium
fixtures... At both locations,
the LED lighting improved
the illumination of the
area and the aesthetics
of the buildings.”
  — Mark Brock, Director of Building
Maintenance, Gwinnett County
Public Schools

still make three or four trips to schools
each year for repairs according to Steve
Jaggears, System-Wide Maintenance
Engineer.
“We usually wait until several fixtures
fail, but if school personnel call to
report an outage, we make the repair
immediately,” Jaggears said.
THE SOLUTION
The GCPS maintenance staff installed
TWH LED wallpack luminaires from
Lithonia Lighting® in high traffic
areas at Central Gwinnett High School
in Lawrenceville and South Gwinnett
High School in Snellville. Maintenance
staff personnel replaced the existing
wallpack units one for one. The LED
luminaires are mounted at the same
locations and are 10 to 12 feet above
the ground and spaced 40 to 60
feet apart.
“The TWH LED wallpack luminaires

have the same footprint as the previous
units, which allowed us to make a
seamless transition without rewiring.”
Jaggears said. “These new luminaires
are identical in appearance to the HPS
luminaires.”

photocell and include a tempered glass
lens that will not discolor which was a
problem with the HPS fixtures.
THE RESULTS

Students, faculty and others
The school system mounted 14 TWH
immediately noticed the difference
LED wallpack luminaires outside two
in the lighting.
gymnasiums at South Gwinnett High
“We piloted the use of LED wallpacks
School and 25 luminaires on the back
at two facilities, retrofitting 250- and
side of Central Gwinnett High School
150- watt high pressure sodium
adjacent to the stadium. The LED
fixtures,” said Mark Brock, Director
luminaires also illuminate the exterior
of Building Maintenance, Gwinnett
of the three-story Black Knight Castle
County Public Schools. “At both
concession stand, a landmark named for locations, the LED lighting improved
the school’s mascot that houses public
the illumination of the area and the
facilities, the press box and coaches
aesthetics of the buildings.”
viewing area.
Jaggears added: “We took before
“This area is very congested during
and after photographs and were
football games and track events,”
amazed at the difference in the light
Jaggears confirmed.
distribution which is apparent whether
Central Gwinnett High School is
you’re standing outside the buildings
bordered by a county highway and
or viewing the photos.”
nearby residences and South Gwinnett
Energy consumption decreased
High School is located on a state
substantially, with the HPS luminaires
highway. Illumination, therefore, had to
operating at 310 and 185 watts
be restricted to the school properties.
compared to 104 and 72 watts for
Luminaires at both schools are lit
the LED luminaires, respectively.
4:30 to 7:30 a.m. and 6 to 9:30 p.m.
According to Jaggears, it is difficult
except during scheduled events. The
to quantify the energy savings
luminaires are controlled by a central
as the school district installed air

conditioning in the gymnasiums,
adding to the energy load.
“Even with the air conditioning of
our gyms we have witnessed a
downward trend in our kilowatt hour
consumption,” Jaggears said. “This is
due to not only our energy efficiency
upgrades, but to the daily operation
of our energy management system.”
The GCPS district expects the LED
wallpack luminaires to substantially
reduce maintenance costs by
delivering more than 100,000 hours
of maintenance-free operation
compared to 20,000 hours for the
HPS luminaires.
“We plan to retrofit additional facilities
with LED wallpacks, not only for the
illumination, but for the labor savings
provided by the LED lamp life,”
Brock said.
The TWH LED wallpack luminaires
include 20 and 30 LEDs, with a 5000K
color temperature and color rendering
index (CRI) of 65.
One-hundred-and-twenty-five schools
within the GCPS district are ENERGY
STAR certified.

KEY FEATURES
PRODUCT USED

% SAVINGS IN ENERGY
COSTS OVER HID

EXPECTED LIFE

REPLACE

TWH LED WALLPACK LUMINAIRES

64%

20+ YEARS

150- & 250-WATT HIGH
PRESSURE SODIUM

LUMENS

LUMEN MAINTENANCE

WATTAGE

CCT (CRI)

4,910 & 6,728

100,000+ HOURS

72 WATTS & 104 WATTS

5000K

“We plan to retrofit additional facilities with LED wallpacks, not
only for the illumination, but for the labor savings provided by
the LED lamp life.”
— Mark Brock, Director of Building Maintenance, Gwinnett County Public Schools

One Lithonia Way | Conyers, Georgia 30012 | Phone: 800.279.8041 | Fax: 770.918.1209 | www.lithonia.com
® 2014 Acuity Brands Lighting, Inc. All rights reserved. | Rev. 5/14 | Job No. 43.01_LL_OP | Form No. 807.134



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