just pennies a day to run.
LEDs are just tiny light bulbs that fit easily into an electrical circuit.
They are illuminated solely by the movement of electrons in a semiconductor
last considerably longer than incandescent or fluorescent lighting. LEDs
don't typically burn out like traditional lighting, but rather gradually
decrease in light output. Their "useful life" is defined by
the Alliance for Solid-State Illumination Systems and Technologies (ASSIST)
as the time it takes until 70% of initial light output is reached, often
50,000 hours. They are resistant to thermal and vibrational shocks and
perform well when subjected to frequent on-off cycling.
Here's how LED light bulbs compare to ordinary bulbs: A regular 40 Watt
incandescent bulb burns through a lot more energy than it needs to produce
the light you see. A large percentage of the energy that goes into a 40
Watt bulb is wasted as heat. LED light bulbs, on the other hand, generate
very little heat as they glow, instead transferring most of their energy
directly into light.
LED light bulbs now produce about the same amount of light per watt as
compact fluorescent bulbs (CFL). However, unlike incandescent bulbs and
CFLs, which splash light in all directions, LED bulbs are directional.
They drive their light in one direction, so that you have light exactly
where you want it. This directional lighting equals savings in yet another
fashion. LEDs don't waste light (energy) on areas you don't need illuminated,
which is also why they're perfect task lights.
LED light bulbs bring a white light into a room. Unlike the yellow light
we're so used to seeing from incandescent bulbs, the white light cast
by LEDs is closer to the color temperature of daylight. The white light
of LEDs is easier on your eyes and it's a great light to read by. Use
an LED light bulb in a task or reading light, and you'll have a bright,
white light to work by.
Low energy consumption
- retrofit bulbs range from 0.83 to 7.3 Watts
life - LED bulbs can last up to 50,000 hours
- LED bulbs are resistant to thermal and vibrational shocks and turn on
instantly from -40C° to 185C°, making them ideal for applications
subject to frequent on-off cycling, such as garages and basements.
of light - good for interior task lighting
No infrared or
ultraviolet radiation - excellent for outdoor use because UV light attracts
Safety and environmentally
conscious - LEDs contain no mercury and remain cool to the touch
- LEDs do not change their color tint when dimmed unlike incandescent
lamps that turn yellow
interference - no ballast to interfere with radio and television signals
Range of color
- LEDs can be manufactured produce all colors of the spectrum without
filters, they can also produce white light in a variety of color temperatures
There are some
current disadvantages to LED lighting:
LEDs are currently more expensive than more conventional lighting technologies,
and may be hard to locate
LED are very
heat sensitive. Excessive heat or inappropriate applications dramatically
reduce both light output and lifespan
typically cast light in one direction at a narrow angle compared to incandescent
or fluorescent lamps so lenses or reflectors are needed in fixtures to
broaden the beam (if desired).
Some common Led applications
Flash Lights (see photo below)
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