LEDs offer numerous benefits due to their mode of operation:
Energy Efficiency
LEDs are highly efficient. In traffic signal lights, a strong market for
LEDs, a red traffic signal head that contains 196 LEDs draws 10W
versus its incandescent counterpart that draws 150W. Various estimates
of potential energy savings range from 82% to 93%. With the red
signal operating about 50% of the day, the complete traffic signal
unit is estimated to save 35-40%. It is estimated that replacing
incandescent lamps in all of America’s some 260,000 traffic signals
(red, green and yellow) could reduce energy consumption by nearly
2.5 billion kWh. At the end of 1997, more than 150,000 signals
were retrofitted, almost all of them red.
In architectural applications, the greatest penetration of LEDs has been
in exit signs, both new signs and retrofits. LED retrofit products,
which come in various forms including light bars, panels and screw
in LED lamps, typically draw 2-5W per sign, resulting in significant
savings versus incandescent lamps with the bonus benefit of much
longer life, which in turn reduces maintenance requirements. Some of
these products are designed specifically for either on-face or two-face
exit signs. Many new LED exit signs are also available, including
edge-lit designs. LED products currently make up about 50% of the
exit sign market. A study conducted by the Lighting Research Center
in 1998 found that about 80% of new exit signs being sold in the
U.S. utilize LEDs. Note that most retrofits are restricted to use in
stencil-type signs versus panel-type signs.
Long Life
Some LEDs are projected to produce a long service life of about
100,000 hours. For this reason LEDs are ideal for
hard-to-reach/maintain fixtures such as exit sign lighting and, combined
with its durability, pathway lighting. This service life can be affected
by the application and environmental factors, including heat and if
being overdriven by the power supply.
Range of Colors
LEDs are available in a range of colors (see above), including white
light. White light can also be produced through color mixing of red,
blue and green LEDs. In addition, through the innovative combination
of various-colored LEDs, dramatic color-changing effects can be
produced from a single fixture through dynamic activation of various
sets of LEDs. Manufacturers such as Color Kinetics offer fixtures that
employ this principle. Color Kinetics offers track, theatrical, underwater,
outdoor and other fixtures utilizing variable-intensity LEDs that can
provide more than 16.7 million colors, including white light. These
fixtures can be individually controlled via a PC, DMX controller or
proprietary controller to generate effects including fixed color, color
washing, cross fading, random color changing, strobing and variable
strobing.
Dr. Nadarajah Narendran of the Lighting Research Center is doing
some exciting research on the use of colored LEDs in retail display
lighting. Preliminary research suggests that using colored LED
background lighting combined with spot lighting on merchandise may
improve energy efficiency and reduce maintenance costs while catching
the eye of the consumer in a fresh manner.
No UV Emissions/Little Infrared
LEDs produce no UV radiation and little heat, making them ideal
for illuminating objects, such as works of art, that are sensitive
to UV light.
Durable
LEDs are highly rugged. They feature no filament that can be
damaged due to shock and vibrations. They are subject to heat,
however, and being overdriven by the power supply.
Small Size/Design Flexibility
A single LED is very small and produces little light overall. However,
this weakness is actually its strength. LEDs can be combined in any
shape to produce desired lumen packages as the design goals and
economics permit. In addition, LEDs can be considered miniature light
fixtures; distribution of light can be controlled by the LEDs’ epoxy
lens, simplifying the construction of architectural fixtures designed to
utilize LEDs. A controller can be connected to an LED fixture to
selectively dim individual LEDs, resulting in the dynamic control of
distribution, light output and color. Finally, DC power enables the
unit to be easily adaptable to different power supplies.
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】Reffer：DingjucarlightEditor：SALES HUAuthor：SALES HU
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