And existing incandescent, fluorescent, energy saving lamps, halogen lamps and high pressure sodium compared, LED light source with 6 big obvious advantages, including: longevity (life up to 50,000 up to 100,000 hours, compared with the traditional light source life more than 10 times more), energy savings (the same light energy than traditional light sources over 80%), the program easy to use, low cost, robust and environmentally friendly (no radiation, waste recycling, and not a living element), which makes it highlights the energy savings in today's economic situation has become very attractive option.
U.S. Department of Energy states: Energy by lighting the United States accounted for 22% of annual energy production. Wide use of LED lighting will reduce energy consumption by 50%. If the goal in mind, then 2027, LED lighting to achieve annual energy consumption reduction will be equivalent to 5 billion barrels of oil, and also reduces carbon dioxide emissions.
I personally believe that the long term, LED lighting will surely dominate the world. In fact, LED lighting family has in the past lighting market is fast developing. According to Osram Optical Semiconductor Research in 2008, global annual shipments of household lighting the lamp has reached 50 billion or so.
Some industry experts believe, a green LED lighting mass market and steady growth in demand will cause the IC industry, VCD, DVD, mobile phones, MP3 after the consumer electronics market, has a super tsunami! Market research firm iSuppli also predicts LED lighting market in 2009 from 70 billion dollars in 2011-90000000000, including ultra-high brightness LED lighting market is the fastest growing segment of the market. This shows that in the next few years, a large backlit display LCDHDTV lighting, highway lighting, key lighting, and construction sites will be rapid development of the lighting market.
LED light source technology matured, the rapid growth of lumens per watt LED, High Power LED lighting has made an important step of 100 lumens / watt, and some manufacturers even claim that the LED lights up to 120 lm / W. This means that, in terms of energy efficiency, LED is now gone beyond saving CFL light bulbs (light of 80 lumens / watt). Experts predict that by 2012, LED lights up to 150 lumens / watt.
LED current price of their entry into the major obstacle to mass market consumers, but recent price drop LED rapidly. For 1WLED light source, for example, spring 2008, the price is the price of third spring 2006, spring 2009 was reduced to one quarter 2006th Polybrite Corporation (a leading provider of LED lighting products) also said in the past 12 months, single white LED price fell to 1.50 from $ 8. A predicted in 2009, replacing incandescent bulbs with LED's price will be accepted by consumers.
They said it was true. According to my understanding, the last LED expensive mainly due to patent most of their manufacturing companies in Japan in the hands of control, but also wants to license the production of foreign patents, a leading supplier of LED is just a few. However, the patent expiration date for this year, when spent, I believe the Chinese mainland and Taiwan will soon appear in a myriad of home LED manufacturers, LED down further rapid price.
From the application point of view, less than 25W of LED lighting applications will gradually enter the portable handheld products (such as PMP and MID), reading lamps, dining room lights, bedside lamps, marker lamps, identification lamps, decorative lights, grille lights, auto lights, auto light beam, automatically turning on lights, and even auto multimedia display. 25W-100W LED lighting applications in the automotive headlights, architectural lighting and office lighting applications found useless. LED lighting applications above 100W in large LCD-TV, highways, large square tv wall and Industrial lighting is widely popular.
It should be noted that the LED lighting products that are designed to make the controller must operate at full production capacity of 70-90% of the best work area. Use full load output current control circuit will be small because space cooling in low light, LED lighting and easily lead to fatigue and early failure occurred.
In addition to other thermal management challenges, the system designer will encounter three major design challenge is how to keep more than 80% total power conversion efficiency, flicker-free dimming in order to prevent the LED color cast.