LED revolution that gave a new high-quality light sources to the world, will certainly take place in people's history on a par with the invention of the steam engine, electric incandescent lamp, television and transistor. This is not just a common technical discovery. This invention is made to change our environment affecting light, color and info components. Today, light-emitting diode projects involve about a hundred of companies, thousands of examination laboratories and milliards of dollars of investments and circulation.



Recently, the broad masses started to buy compact fluorescent lamps, which have the similar principle of work as the long ones that work in public places. And LEDs aren't so popular still, mainly because of really high cost. But it's a temporary matter. LEDs have prospective ability to exceed all kinds of lamps in efficiency that is considering now by lot of researchers. The balance of power in the world doesn't sense any impact from the LEDs that we utilize these days as indicators, components of monitors and in other kinds of electronic devices. And light-emitting diodes utilized in lighting will alter it at all.

Scientists Kim and Schubert claim that in a few years we'll be the eyewitnesses of light-emitting diode revolution. In their paper, published in the Optics Express journal, Kim and Schubert speak about "substitution occurrence" i.e. the entire substitution of incandescent lamps to light-emitting diodes. The thing is that on reaching a crucial mass the improvement in the sphere of light-emitting diodes would "burst" not just quantitative but qualitative change of life. Do not you think that it will be great if the consumption of electricity will be diminished in twenty times for lighting of apartments and streets?

Light-emitting diodes have the next fundamental characteristics:

- Power. The power can vary from a few milliwatts to tens of watts and it defines the flux and volume of light-emitting diode. Heat sink is an important part for LEDs even if their size is little.

- The temperature of color. The main color utilized for illumination is white that's why we will speak of it further. Light-emitting diodes typically get five shades of white: from cold white to warm white. LEDs of cool white have higher luminous efficacy than warm white ones.

- Term of Service. Incandescent lamps have less service period than LEDs. But the manufacturer also plays here a significant part. High grade light-emitting diodes have service period approximately 100 000 hours that equals more than 10 years of continuous work. You can find that light-emitting diodes are semiconductor tools, that is why the quality of electric transformer plays really important part here.

LEDs also get some benefits in utilization and here they are:

- Longevity. As it was told before LEDs have rather long period of life it may be more than 10 years that is in 100 time longer than incandescence lamps have;

- A permanent stream of light that doesn't rely on the supply voltage;

- You can manually change the light flux and supply voltage from 0 to 100 percent;

- A great safety level. Little voltage power supply and impact resistance allow utilizing LEDs in a humid, dusty or gassy conditions;

That was a little observation of led leiste produces that are rather urgent today.