"LEDs [url=http://www.blueboolighting.com]LED lights supplier[/url] are extremely robust, perform well at low temperatures, are easily controlled digitally, and operate as Safety Extra Low Voltage (SELV) devices, making them safe and simple to install.They are easily powered by sustainable sources, like photovoltaic (PV) arrays, small wind turbines or fuel cells.Their life expectancy is exceptionally high, some will lose little more than a quarter of their efficiency after 50,000 hours of operation. Furthermore, LEDs don’t flicker like other bulbs, and they light up instantly. LEDs are incredibly versatile and part of everyone’s everyday life — they are used in mobile phones and freezers, they light up theatres and traffic signals, they illuminate bridges and beautiful landmarks. They can alter moods and create calm, and provide atmospheric surroundings, both inside and out.Add this to the benefits of longer life, energy efficiency and durability and it seems LEDs are indeed Light–Emitting Diodes with a Lasting Efficient Design whose performance will continue to increase twenty fold with each new decade. According to Haitz’s Law every ten years the cost of LEDs falls ten fold, whilst their performance increases twenty fold. And this trend, named after LED scientist Roland Haitz, seems set to continue as LEDs become a law unto themselves.It’s easy to see why. LEDs might be more expensive to buy, but they save money in the long run in terms of energy and maintenance — they consume less power, they don’t contain harmful chemicals such as mercury, and they last ten times longer than conventional lights. As a form of Solid State Lighting (SSL), LEDs are actually not as new as people might think. In fact the first dim yellow version was created in 1907 by Henry J Round from a silicon carbide (SIC) semiconductor using electricity.However it wasn’t until the 1980s that the first bright LEDs appeared and, as their popularity grew, so the range has been extended to include white light LEDs (WLEDs). They quickly became the ideal answer for mood and scene setting, both inside and out, with the availability of single colour LEDs, or three–coloured LEDs, i.e. red, green and blue (RGB), or amber, white and blue (AWB), enabling designers to mix colours within one light, or by using several. Today’s LED is a type of semiconductor diode, comprising a chip of semiconducting material impregnated with ‘impurities’ (materials). This creates a pn junction through which a DC electric current of the correct polarity passes through, creating charge carriers — so that when an electron meets a ‘hole’, it falls into a lower energy level, causing energy to be released in the form of a photon. This results in light being emitted as electro luminescence.Depending upon the mix of materials, a number of colours can be produced, including saturated red, green, blue, ultraviolet, orange and yellow colours, warm white, pure white), near ultraviolet (UV), visible or infrared. This makes electronic LEDs versatile and powerful, for example for showcasing architectural landmarks, providing decoration, or guidance along garden paths — they can blend in or make statement, and as such have become a vital tool for interior designers.However, in serious lighting terms, providing sufficient thought is put into their design and application, LEDs bring many benefits: They are extremely compact, meaning they need less material to make them, and are perfect where space is a premium, both for fitting and storage. In order to produce enough light for general lighting applications, a group, known as ‘arrays’ are necessary and the consequent heat generated must be conducted away. Depending upon the application, LED lighting can produce 90% efficiency as it produces narrow spectrum monochromatic light. Compare this to the 9% efficiency of a conventional incandescent lamp and LEDs are an excellent means of helping to reduce global warming. However, the highest level of efficacy is only achievable with low output red LEDs, therefore the goal of LED lighting technology is to produce a WLED that will be bright and cost–effective enough to replace conventional lamps."