Why do solar lights use LED as lighting source?
All our solar lights use LED as lighting source. Please check www.esolarlighting.com to see our items.
What is an LED?
LED
is the common abbreviation for a light-emitting diode. Each individual
LED consists of a semiconductor diode that emits light when a voltage
is applied to it. Unlike incandescent or fluorescent lamps, which
create light with filaments and gases encased in a glass bulb, an LED
is a semiconductor device, which emits visible light when an electric
current passes through it.
Advantages:
— LEDS in lighting fixtures can provide over 100,000 hours in solar
applications. In comparison, an incandescent light bulb lasts
approximately 1,000 hours.
Not all LEDS are the same
LEDS come in many form factors. These affect their operation.
LEDs promise to transform the way we light the world
That
promise is found in LED’s ability to save energy, reduce maintenance
costs, and change the way we look at our entire lighting infrastructure. LED system performance depends not only on the performance of individual components, but also on how they interact. Poor
integration can lead to premature failure of LED-based lighting
systems. Sol LED systems optimize integrated system performance, which
means our LED systems will live up to their promise of long life,
energy savings and reduced maintenance.
Sol is at the forefront of the LED revolution for street lighting
Using
our extensive experience in solar lighting, our engineers have
developed a family of LED products, which are specifically designed to
capture the power and efficiency of this advanced solid-state
technology.
Delivering Performance and Dependability
The
unique characteristics of LED performance have been addressed with
specific heat dissipation features. Because LEDS last longer, the labor
and expense of multiple lamp changes is reduced. Maintenance costs are lower and this provides reduced total cost of ownership.
LEDS
are solid-state devices which contain no mercury and last five times
longer than metal halides – helping to reduce environmental waste.
Lumens per watt has long been the standard for measuring the efficiency of lighting fixtures. Sol’s latest Quad Series delivers the most lumens per watt of any LED configuration. Since 1990, Sol has had a solid reputation of providing reliable solar lighting products. Our engineers are experts at maximizing light output.
What makes LEDS so great?
- LED lighting is increasingly used in a variety of lighting applications because it offers many benefits, including:
LonLong Life - Highly Efficient
- Energy Savings
- No warm up time
- Better quality of light output
- No hazardous disposal – unlike CF, CCFL, LPS and HPS which contain mercury
- Intrinsically safe
- Durable LED
lighting systems have already proved to be very effective in indicator
applications where brightness, visibility, and long-life are important. Outdoor lighting applications such as street lighting, parking lot lighting, and security lighting can benefit as well.
What is the life of an LED?
LEDS generally do not fail by burning out but slowly reduce light output over time. As solid-state devices, they will continue to operate even after 100,000 hours (solar applications). Comparisons
of lumen maintenance near the end of the rated life for traditional
light sources (i.e., incandescent, fluorescent, HID) have shown that
with the exception of metal halide lamps, these traditional light
sources usually have at least 80% of their initial light output by the
time they have operated 10,000 hours. Furthermore, when
light level reductions occur over time, people tend not to notice them
until the light level reaches 80% of the initial output. This is the basis for “useful life” for lighting sources.
What is an LED lighting system?
As
with other light source technologies, such as fluorescent, CCFL and
HID, lighting systems using LEDS can be thought of as having a light
source (typically the combination of LEDS that form the light source
itself), a ballast (for LEDS it is often called a driver), and a
luminaire (the fixture).
LEDS require a specific electrical polarity. Applying voltage in reverse polarity can destroy them. A slight change in voltage can result in very large changes in current. Since the light output of an LED is proportional to its current, LEDS can be driven at various light outputs. If
the resulting current exceeds limits recommended by the specific LED
manufacturer, the long term performance of the LED can be affected
resulting in shorter useful life. This means that many LEDS can produce a high light output, but have a very short life.
An LED driver performs a function similar to a ballast for discharge lamps. It controls the current flowing through the LED. Most LED drivers are designed to provide current to a specific device or array. It is very important that a driver be matched to the specific device.
LED systems are rated in terms of luminous intensity in candelas (foot-candles) rather than light output in terms of lumens. Luminous
intensity is a function of the angle from which an LED is seen, so this
value should be considered carefully when used to characterize light
output of a particular LED source. Two LEDS with the same
luminous flux output can have very different peak luminous intensities,
if they are designed to produce different beam angles.
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