Green Led

New Concept of Green & Energy Saving Lighting - LED lights

LEDs are semiconductor devices semiconductors that convert electrical energy directly into light.
Thermal sources of light such as flames and incandescent filaments emit light when heated, either by chemical reaction (flames) or electrical heating (filament lamps). LED "cold" lead generation in the light of a high efficiency because most of the energy radiates in the visible spectrum.
Other common high efficiency light sources, such as fluorescent lamps and electro luminescent devices, also produce light without much thermal radiation outside the visible spectrum.
Because LEDs are semiconductor devices, they can be extremely small and durable, they also provide life than the other light sources.

The light is generated inside the chip, a solid crystal material, when current flows through the junctions of different material compositions.

An LED consists of two elements of the treated material called semiconductor P-type semiconductor and N type These two elements are placed in direct contact, forming a region called the PN junction. The composition of different materials determines the wavelength and thus the color of the light generated.

LED resembles most other diode types, but there are important differences. The LED is a transparent package, allowing visible or IR energy to pass through. In addition, the LED has a large PN-junction area whose shape is adapted to the application. The device of Figure 1 is an AlGaInP LED because the semiconductor layers are aluminum (Al), gallium (Ga), indium (In) and phosphate (P).

Principal subjects LED

The main semiconductor materials used for the manufacture of LEDs are as follows:

* Indium gallium nitride (InGaN) blue, green and ultraviolet high-brightness LED
* Aluminum gallium indium phosphide (AlGaInP): yellow, orange and red high-brightness LEDs
* The aluminum gallium arsenide (AlGaAs) LED red and IR
* Gallium phosphide (GaP): yellow and green LEDs

Why LED?

LEDs have a range of benefits which is fast making the best lighting solution for real energy efficient. Over the years some aspects should change significantly.

Life
As light sources semiconductor diodes have a very long lifetime and are generally very robust due to the absence of mechanical or moving parts.
Incandescent bulbs have a life expectancy of 1k to 5k hours, while LED quality are often cited for having a life of 50k hours, more than 5 years of continuous use. However, it is important to understand that the performance of LEDs over time, and this degradation is strongly influenced by factors such as operating current and temperature.

Low Maintenance
The long lifetime of LEDs reduces the need to replace lamps has failed, and this can lead to significant financial and environmental savings, particularly in maintenance, labor and recycling. This makes LED accessories useful for installations in inaccessible places, but if tasks such as cleaning the light fixtures are required, the light sources could be replaced at the same time, denial of service "low" benefit .

Efficiency
As a semiconductor device, LEDs are very efficient. device technology today allows the performance of the latter to be pushed to limits that exceed that of standard lighting.
The directional nature of light produced by LEDs allows the design of fixtures with a higher overall.

Low energy
The low power consumption of LEDs leads to considerable energy savings that can often lead to the installation of LED-B.