History of LED
The LED (Light Emitting Diode) is the light source of the future. LED light is generated with a high luminous efficiency and thereby a low energy consumption. The LED offers a number of other positive characteristics. 1962 was General Electric with the first red LED on the market. Approximately 10 years later by colors such as green, orange and yellow. It was only in the 90s it was time that LED light blue and thus shine in white could. White consists of the colors red, blue and green. It is only a matter of time, then solves LED light that of incandescent and halogen bulbs from.
  

Operation of the LED
It consists of two different doping semiconductors, the P and N form a layer. If these are held together, it results in a PN junction or a so-called barrier layer. With the voltage applied in the forward direction will emit to the barrier layer, the LED light. By selecting the various semiconductor, the different LED light colors arise. The LED light bulb converts in contrast to the energy directly into light.

Advantages of LED
• High efficiency, resulting in low energy consumption
• low heat
• Long life of up 100'000 hours.
• Start immediately
• shock and vibration resistant
• hum-free
• No UV and IR radiation, no insects Irritierung
• Most products are RoHS compliant
• the personal safety extra low voltage
• small size (SMD) possible
• LED light (light color) adjustable (RGB)
  

Applications of LED
• Facade lighting
• living area (kitchen, corridor U.s.w.)
• Accent lighting
• illuminate objects
• create moods
• Furniture Lights
• Illuminated advertising
• emergency lighting
• Museum and Picture Lights (no UV and IR radiation)
• Underwater Lights (voltage protection)
• Displays
• Showman (shock and vibration)
• area lights u.s.w
  

Aging and lifespan of the LED
For standard LED lifetimes of up to 100,000 hours (approx. 11.5 years light duration) can be achieved. The lifetime of high-efficiency LED is ca.25'000 - 50,000. For details of life are average values. That is, after the specified service life is 50% of 100% must be on. The end of life of the LED is achieved if it has only 50% of the luminosity. The lifetime is generally dependent on the LED on various factors. A strongly fluctuating ambient temperature will shorten the life, as well as to high currents and voltages.