ergy costs generally are reduced by six
to seven times, and replacing fluorescent with LEDs reduces energy costs by
two to three times.
Our LED installation is maintenance-free. We expect this to continue for 20
to 30 years. My expectations have been
exceeded in that electrical personnel
no longer need to replace fluorescent
bulbs with lifespans that are predictably very short.
This is by far the largest energy
breakthrough since the incandescent
Smith, Cooper Lighting. The answer is complex and depends on
the application and the light levels
If the application can take advantage
of the optical control characteristics of
LEDs, the user may drastically cut the
number of LEDs required to provide adequate light levels, which significantly
reduces energy consumption.
Cold-storage applications that have
ambient temperatures of - 30 degrees
C would consume less power than the
same product installed in 20-degrees-C
ambient because of LED’s higher efficiencies stemming from lower forward
voltage from the cold temperature. The
use of controls would extend the life
while reducing energy; however, the installed costs would be higher to deploy
the controls. So, the answer is multifaceted.
40 to 75 Percent Energy Reduction. Against incumbent
lighting technologies of metal halide,
linear fluorescent, and HPS, facility
managers can expect to achieve between 40 and 60 percent energy reduction using LED lighting. In a warehouse,
even greater savings can be obtained by
using occupancy sensors, which can
further cut energy consumption in half
for a total reduction of 75 percent.
LED lighting can cost more upfront
than antiquated lighting technologies—
but the ongoing energy savings and
“The LED option has
about a 12 times better
maintenance cycle and a
40 percent lower power
consumption with virtu-
ally unlimited life.”
— William Busch,
maintenance avoidance can quickly recoup these costs and deliver additional
Ford, Osram Sylvania. The LED fixture cost and energy consumption
are dependent on the application.
Savings at Two Times Price Point.
If the price point of an LED fixture is
no more than two times the cost of a
traditional lighting fixture typically used,
then it may be an economically feasible
Ceramic metal halide fixtures with
bilevel electronic ballasts are another
alternative if a single lamp fixture is preferred, but look for a high-efficiency fixture. In addition, some high-bay fixtures
with 200-W ceramic metal halide lamps
on electronic ballasts can replace up
to a 400-W metal halide fixture. Both
the 4-lamp T5HO and single-lamp, 200-
W ceramic metal halide fixtures reduce
energy consumption by approximately
50 percent compared to a 400-W metal
By taking advantage of utility rebates, users can dramatically reduce
the cost to install LED fixtures.
Low Maintenance Helps Bottom
Line. The long life of an LED lighting system has additional benefits for the bottom line because less frequent lighting
maintenance is needed, minimizing costly manufacturing downtime to replace
lamps. This should be factored into the
total cost of ownership calculations.
Spencer, Lusio. Low Total Cost of
Ownership. When considering a
move to LEDs for general illumination,
companies should consider several factors in addition to energy savings.
These include a long product lifetime;
low maintenance requirements; the
ability to use occupancy sensors; dimming capabilities; and no heat gain—all
of which contribute to an accurate assessment of the cost of ownership of
any lighting system.
Kaminski, Waldmann Lighting.
Savings in Low or No Maintenance. Although LEDs do realize some
energy conservation, the majority of
cost savings comes from low or no
maintenance, which allows for continuous manufacturing without downtime to
fix lighting and associated labor costs.
Busch, Philips Day-Brite.
40 Percent Lower Power Consumption.
Each application is different as required
light levels vary by the application or
task being performed. The commonly
used HID luminaire in a manufacturing
application, a 400-W probe-start metal
halide high-bay, has a power consumption of 460 W. The lamp has an L70 of
8,000 hours and an average rated life
of 20,000 hours.
A typical LED high-bay that can produce the same light levels as this 400-
W unit has a power consumption of
288 W, an L70 of 100,000 hours, and
an average rated life that far exceeds
100,000 hours, because LEDs do not
burn out like metal halide lamps do.
This says that the LED option has
about a 12 times better maintenance
cycle and a 40 percent lower power
consumption with virtually unlimited
life. The user can expect to pay a much
higher cost for an LED luminaire, but
will realize a reduced total cost of ownership compared to a traditional metal
Schratz, Dialight. More Than 60
Percent Savings. Typically, our
150-W LED high bay is replacing 400-W