LED lighting technical problems still need to overcome the trend

Proposed by ETP in 2008 2050, global carbon emissions from 620 tons down to 140 tons (BLUEMapscenario), to reduce the 480 tons of key technologies, to improve the efficiency of energy use is the most important, is expected to account for 47%, followed by the supply of renewable energy, 21%.led lighting is from the end of electricity the way, in line with the trend of low carbon economy.

What is the efficiency trend of LED? The luminous efficiency of various light sources, incandescent lamp and halogen lamp bulbs only 20~30lm/W, about 70lm/W, HID increased to 100lm/W, the luminous efficiency of the lamp tube slightly to nearly 120lm/W, but in 2010 were only about 80lm/W and 30lm/W to LED and OLED, but showed a rapid improvement in the situation, the next few years is expected to break the traditional lamp, LED laboratory data will go towards 200lm/W.

2000 optical fiber home (FTTH) shouted loudly, creating the optical communication industry has been good, but the rapid development of wireless communication becomes a substitute products, the optical communication industry rapid decline. Today's LED is expected to play the role of the wireless communications industry, as a new generation of lighting options.

Incandescent bulbs release energy because of the vast majority of infrared light, so the continuous heating of the ambient temperature, in fact, is not ideal lighting fixtures. At present, 20~40W lamps, LED replace the trend is mature, 60W there is no problem of heat. In addition, glare LED also needs to be improved.

The United States announced the closure of the last of the incandescent light bulb factory GE days before, are echoes of the United States in 2007 to eliminate all incandescent bulbs announced before 2014, also shows the low energy efficiency of incandescent bulbs. In addition, PHILPS also pointed out that LED will be the main driving force in the lighting industry, and is expected to be based on the penetration rate of turnover to more than 50% in 2015. The fastest pace of Japan has reached 50%.

Commercial development trend of LED lighting

Although LED lighting trend is clear, but now only do LED lighting is very difficult to survive, is not standard, technology is not mature diding. Not only that, LED's optoelectronics industry and the lighting industry is the 2 different areas, meet together also need more than. As the lighting industry often family enterprises, highly disciplined, ecological LocalKing be handed down from age to age, obviously, the new LED light source, adopt a wait-and-see attitude, or try to put a little water resources, high profit. The LED lamp is still in the spring and Autumn period, and the light output of the lamp and the quality requirements of each light there is still a lot of room for improvement, access is not mature, the industry are still not able to make a profit.

The relationship between absolute popularity and price of LED, the current LED lighting retail price of $20, an incandescent lamp is $1.5, the expected price dropped to $15, the permeability of up to 4%, to 7.5 to reach $10%, $3.75, which is 2.5 times that of incandescent lamp, the permeability of up to 25%.

EPISTAR is committed to the realization of the LED application of infinite possibilities, the past is the first home and Samsung LED will be used in mobile phone manufacturers, used in notebook computer market share reached 50%, used in television in South Korea is not high self-sufficiency rate is also up to 50%, now also in lighting applications more investment.

Why are LED lighting prices too high? Analysis of the cost structure of LED lighting can get a clear direction, the relative cost of heat dissipation and metal bonding accounted for the highest proportion, followed by the driver, and the cost of LED Bin. It is believed that the high price of LED grain is the reason, in fact, the proportion of the crystal is very small, even smaller than the current price of phosphor.

The United States Department of energy has set clear goals for LED, including luminous efficiency, price, and details of the phosphor conversion. At present, the cooling efficiency can reach 80%, but the market will be a huge warm state to drop another 20%, leaving the remaining 60%, so many technical development to seek a breakthrough.

In 2010 800lm lighting calculation, luminous efficiency of 100lm/W, according to the optical efficiency of 0.5 (the other 0.5 are hot), the calculation of driving efficiency of 80% and the optical efficiency of 80% and DELtaT106.3, the input power is 12.5W, when the situation if the annual itemized calculation efficiency improvement, luminous efficiency of 150lm/ W by 2015, 0.75 (the other 0.25 for the light efficiency hot) when the input power is 6.6W, the heat generated is less than 2W (6.6x25%), therefore, it was important to heat, is not a problem in the future.

Another problem is the use of LED lamps, to allow consumers to open or close as well, so the development of ACLED technology is very important. But the ACLED bridge rectifier is more expensive, so from the integrated single chip pulled into a single chip is connected with a bridge rectifier diode, a high voltage (HV) LED chip, suitable for high voltage and low current (without transformer), because in the bridge type rectifier, which can increase the luminous area, AC, DC apply, province power costs are also applicable to the existing dimming circuit (Dimming).

Crystal electric and original blue HVLED, for InGaNLED, the brightness increased by 20%, and red HVLED, AlGaInPLED, can be the original gap of nearly 30% of the warm light and cold shortened to close, this year's development target for 130lm/W in 2012, when the heat can reach more than 150lm/W, inaction, is no longer a problem.