Veterans Administration Center. The LED retrofits here created higher glare potential like
at the other sites. All of the differences for
light levels and glare were slight, but individual occupants may notice issues no matter
what. For example, people at the Dallas site
complained of low light levels in one area,
likely due to the different light output in
the installed lamps – a higher wattage lamp
would have likely solved the issue.
The report declares both products cost-effective using the national average energy
rate of 10 cents per k Wh. However, that conclusion reflects a payback of 7. 3-8.2 years
for LED-A and 7.1-8 years for LED-B, which
may be too long for FMs in private industry.
WHEN LINEAR LEDS MAKE
The linear LED products met the GSA’s
requirements and are a viable option for
any retrofit or relamping project intended
to replace fluorescent fixtures. However, the
report notes that due diligence regarding
continued from page 17
technology and product selection is vital to
anyone considering a similar project given
the variety of LED products on the market.
The agency recommends evaluating any
potential retrofit products on these factors:
n Product efficacy: Refer to existing
lighting program requirements to set
minimum efficacy criteria, then screen
product options against those needs.
n Light delivery: Ensure that the replace-
ment will provide appropriate lighting for
the tasks in each space. You may have
to measure the existing conditions or
conduct modeling exercises to make sure
post-retrofit light levels are reasonable.
n Light distribution: LEDs are directional,
unlike fluorescent lamps, which can cre-
ate uneven, unappealing light patterns.
n Product useful life: The replacement
should last as long or longer than the
existing lamp. Many LEDs have the
potential to last longer than fluores-
cent lamps and are typically rated with
high lifetimes, but before you take the
plunge, consider whether that long life
will actually be used. If the space may
Tips for High-Bay
CONSIDERING A LIGHTING
RETROFIT FOR A TOUGH SPACE?
LEDS MAY FIT THE BILL
If you have a warehouse, meeting space or supermarket in your portfolio, you’re probably aware of the cost and com- plexity of high bay lighting applications. Finding the right fit for these spaces is
a challenge, but the long life and low maintenance needs of LED lighting may be a
good match for your facility. Ensure a successful LED retrofit with these tips.
1) SPECIFY THE SAME BASE
Before you start weighing any other product specifications, make sure you’re only
looking at lamps with the same base (such
as metal halide base E39 or incandescent
18 BUILDINGS 01.17
be reconfigured soon or has a low lighting
use time, a very long-life product may not
be worth it.
n Lighting color: LEDs come in color tem-
peratures similar to fluorescent lamps. The
GSA recommends choosing LED lamps
with the same color temperature as the
previous fluorescent lamps.
n Installation time and cost: LED direct
lamp replacements cost more than fluo-
rescent lamps and the labor costs can vary
widely. Depending on how much rewiring
is needed, a new LED fixture might be just
as affordable as a replacement kit.
n Installation capability: Make sure the
existing system has the right ballast type
to operate the LEDs – usually an electronic
instant-start. Determine whether the exist-
ing optical system is easily removable, how
the ballast is accessible and how difficult it
is to access, what type of ballast is required
and how many sockets are installed.
n Maintenance: Longer lifetimes can mean
significant savings from fewer replace-
ments, so include reduced maintenance in
cost and budget proposals.
base E26 medium), as well as the same
aesthetic effect, the Department of Energy
recommends. This will ensure that your
new LED lamps produce roughly the same
amount of light while consuming less energy.
2) CONSIDER CONTROL
LEDs dim easily and work well with lighting control systems, which can be very useful
in tricky lighting situations where a couple of
light switches won’t cut it. Dillon Gymnasium,
which houses NCAA wrestling and volleyball
matches at Princeton University and also
serves as a base for the campus recreation
program, received a 111-fixture lighting retrofit with a sophisticated control system in
“We ended up working with the manufacturer to create a custom interface,”
notes William Evans, Electrical Engineer for
Princeton University. “We initially reduced
energy consumption from 256W down to
180W for each fixture, but once we installed
the control system, we were able to reduce
it again by 80% during recreational times
due to the occupancy sensors we employed
3) KNOW YOUR USAGE
Understand where and how each space
uses lighting to find additional opportunities for your LED lighting to save money. One
project, a retrofit at a 1 million-square-foot
Ace Hardware distribution facility in Rocklin,
CA, was projected to save roughly 50% on
energy just from upgrading to LED from
metal halide. The owner hoped to save an
additional 50% on the lighting control system
for a total savings of 75% but needed to fine-tune the control strategies first.
The lighting control system was eventually configured to enable several strategies.
The facility started with task tuning, then
progressed to occupancy control with coarse
zoning and daylight compensation. Data from
the occupancy sensors in each luminaire was
analyzed and showed the team that not all
of the stock areas were accessed with the
same frequency, which could facilitate additional savings. The owners revised their lighting strategies to include fine zones, some
of which only included one fixture. The end
result: energy savings averaging 81% over the
1,500 T5 fluorescent and 100 metal halide fixtures previously installed in the facility.