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Gwinnett County Public Schools

TWH LED Wallpack Luminaires

TWH LED Wallpack Luminaires

Energy savings, long life.

n Project: Gwinnett County Public Schools, Georgia n Product Used: TWH LED Wallpack Luminaires

n 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 150-

and 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.

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

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

“ We piloted the use of LED

wallpacks at two facilities,

retrofitting 250- and 150-

watt 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

BEFORE AFTER

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.”

The school system mounted 14 TWH

LED wallpack luminaires outside two

gymnasiums at South Gwinnett High

School and 25 luminaires on the back

side of Central Gwinnett High School

adjacent to the stadium. The LED

luminaires also illuminate the exterior

of the three-story Black Knight Castle

concession stand, a landmark named for

the school’s mascot that houses public

facilities, the press box and coaches

viewing area.

“This area is very congested during

football games and track events,”

Jaggears confirmed.

Central Gwinnett High School is

bordered by a county highway and

nearby residences and South Gwinnett

High School is located on a state

highway. Illumination, therefore, had to

be restricted to the school properties.

Luminaires at both schools are lit

4:30 to 7:30 a.m. and 6 to 9:30 p.m.

except during scheduled events. The

luminaires are controlled by a central

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

immediately noticed the difference

in the lighting.

“We piloted the use of LED wallpacks

at two facilities, retrofitting 250- and

150- watt high pressure sodium

fixtures,” said Mark Brock, Director

of Building Maintenance, Gwinnett

County Public Schools. “At both

locations, the LED lighting improved

the illumination of the area and the

aesthetics of the buildings.”

Jaggears added: “We took before

and after photographs and were

amazed at the difference in the light

distribution which is apparent whether

you’re standing outside the buildings

or viewing the photos.”

Energy consumption decreased

substantially, with the HPS luminaires

operating at 310 and 185 watts

compared to 104 and 72 watts for

the LED luminaires, respectively.

According to Jaggears, it is difficult

to quantify the energy savings

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