> PROFILE PUEBLO ELECTRICS
To get the same lighting quality an LED system provides,
PCS would have to put in two to three times more metal-halide
fixtures. Therefore, the district opted for the LED system,
which required fewer fixtures and offered better coverage,
bringing daytime atmosphere to night games.
PE met with LED manufacturers and liked the Q-LED system
from Qualite Sports Lighting. This system is installed at University of Phoenix Stadium and Duke University, and it is currently
going in at the Minnesota Vikings’ and Miami Dolphins’ football
stadiums and Fenway Park baseball stadium in Boston.
PCS faced another lighting-cost challenge that the local utility, Black Hills Energy, brought to its attention. The lights the
stadium had used for decades were wired on a single-phase distribution system with a single meter, and, during peak demand,
the usage was so high that it put PCS into a ratcheted rate
bracket, significantly raising annual energy costs. PE met with
Black Hills Energy and decided it made sense for the stadium to
break its distribution into multiple systems with smaller loads.
In that utility’s district, a system that doesn’t run over 50 kilowatts (k W) is not subject to the ratcheted rate the stadium was
paying under the single system.
So with those six workers, who were later dedicated to the
scoreboard installation, PE broke the system into four separate
distributed systems, each of which never operates above 50 k W.
They ran 3,000 feet of fiber optic cable and 12,000 feet of cable
to feed the lights.
Installing the poles was demanding, since the overhead
lighting had to fit in the bowl shape of the stadium and holes
needed to be bored through shale. This was accomplished with
the help of a local crane company
and PAR Electrical Contractors
Inc., which dug the 6-foot-wide-
by-13-foot-deep holes. Each lamp
came with gravity-cast mount-
ing brackets. Although the lights
come pre-aimed from the factory,
they could be adjusted with laser-
guided aiming to ensure the lights
cast evenly across the field.
The 120 LED fixtures and
built-in drivers that PE installed
are DLC certified and UL and
ETL listed. Guarienti said that
the system offers the best spill
glare control in the industry and
has patents pending.
“Their 225,000 hours of
operating life are the best in the
industry,” he said.
The fixtures stay cool, never reaching a temperature above
87. 7°F. The high-power-density metal-core lamps also come with
a corrosion-resistant, die-cast aluminum heat sink to maximize
the thermal management and light performance.
The lighting included all military-grade hardware with U.S.-made materials, Guarienti said.
With everything finished, the school district and Pueblo community are enjoying the results.
“This is the best improvement we’ve made to the stadium
in a very long time,” Lawson said.
The stadium itself was built in 1950, and hasn’t had a major
renovation for 50 years.
The LEDs have been a boost for players and fans. Play is now
easier to see from the stands, and it has affected how the stadium
is presented on television. Because LED lights don’t necessarily
flicker, viewers won’t be distracted by flashing while watching
slow-motion replays. In addition, while metal-halide lights need
time to warm up, LEDs turn on immediately.
The school district projects that it will see a lighting-based
energy savings of $40,000 each year, reducing costs from
$100,000 a year to $60,000.
PCS’ lighting fixtures both improve the visibility and reduce
energy consumption, which will provide significant cost savings
in the future.
PE was happy to be part of this project, which will benefit the
community and students for years to come.
S WEDBERG is a freelance writer based in western Washington.
She can be reached at email@example.com. P U
Pueblo Electrics installed a 67-foot-wide video scoreboard to replace Pueblo City School’s outdated board.