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LED Lightings for Navy Vessels (NLL)
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LED Lights
LEDs, or light-emitting diodes, are a form of solid-state lighting that is extremely efficient and long-lasting.
While incandescent and fluorescent lights consist of filaments in glass bulbs or bulbs that contain gases,
LEDs consist of small capsules or lenses in which tiny chips are placed on heat-conducting material.
We, Korea EMI Technologies produce LED lights which meet tough grade of Military standard requirement for shock, vibration and EMI etc.
  
- Size and Efficiency
LEDs measure from 3 to 8 mm long and can be used singly or as part of an array.
The small size and low profile of LEDs allow them to be used in spaces
that are too small for other lightbulbs. In addition, because LEDs give off
light in a specific direction, they are more efficient in application than
incandescent and fluorescent bulbs, which waste energy by emitting light
in all directions.
- Long Life
The life of a high-power white LED is projected to be from 35,000
to 50,000 hours, compared to 750 to 2,000 hours for an incandescent bulb,
8,000 to 10,000 hours for a compact fluorescent and 20,000 to 30,000 hours
for a linear fluorescent bulb. LED lifetimes are rated differently than
conventional lights, which go out when the filament breaks. Typical lifetime
is defined as the average number of hours until light falls to 70 percent
of initial brightness, in lumens. LEDs typically just fade gradually.
- Lower Temperatures
Conventional lightbulbs waste most of their energy as heat. For example,
an incandescent bulb gives off 90 percent of its energy as heat, while a
compact fluorescent bulb wastes 80 percent as heat. LEDs remain cool.
In addition, since they contain no glass components, they are not vulnerable
to vibration or breakage like conventional bulbs.
LEDs are thus better suited for use in areas like sports facilities and high-crime locations.
- Qualified LEDs
Poorly designed LEDs may not be long-lasting or efficient.
LEDs that are qualified should provide stable light output over their projected lifetime.
The light should be of excellent color, with a brightness at least as great as conventional
light sources and efficiency at least as great as fluorescent lighting.
The LEDs should also light up instantly when turned on, should not flicker when dimmed and
should not consume any power when turned off.
Recent News from US Navy
More than 600 new light emitting diode (LED) lighting fixtures were installed on
USS Chafee (DDG 90) during the ship's recently completed availability, providing
the ship with longer-lasting lights that use less electric power than the replaced
incandescent and fluorescent light fixtures.
The new fixtures have a minimum 50,000-hour lifespan compared to the 1,000-hour
incandescent globes and 7,500-hour fluorescents. The ship is expected to save more
than $50,000 per year using the new lights.
"The longer lifespan also results in a huge amount of savings in regards to maintenance,"
said Ben Hatch, electrical engineer at the Naval Surface Warfare Center Carderock Division
- Ship Systems Engineering Station in Philadelphia, who oversaw the installation.
"LEDs last 50 times longer than the incandescent meaning the lights only need to be
replaced every six years compared to what was every other month."
USS Chafee is the first ship to receive all new lighting fixtures.
In early 2012, USS Preble (DDG 88) is expected to receive the same fixtures, as well as
LED bulb replacements for the ship's two-foot fluorescent fixtures, which are the most
common lighting on DDG 51 class ships.
"The T12 fluorescent fixtures will just be a bulb replacement instead of the entire fixture,
" said Hatch. "The cost savings will be even greater because the entire fixture does not need to be replaced."
Savings are expected to exceed $100,000 per ship per year when the scope is expanded to
include the T12 fluorescent fixtures in the backfit program.
The Naval Sea Systems Command will continue installing the fixtures aboard in combatant
and amphibious ships over the next several years as part of the Navy's maritime energy strategy.
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