Xiao Hongqing: look at the competitiveness of LED

Director of the Department of electrical engineering professor Xiao Hongqing Taiwan University of science and technology, Taiwan Institute of lighting

LED replace other light source is currently difficult to be optimistic

2003 LFW (Laser Focus World) forecast: LED light efficiency will reach 200 lm/W in 2025, the annual energy consumption will save $35 billion. But so far (2008) practical white light LED light group can only reach the level of 50 lm/W. The development of Photovoltaic Industry Association of North America (OIDA) was also optimistic estimates, in 2007 the white LED light efficiency can reach 75 lm/W in 2012 to 150 lm/W, and because of the rapid decline in prices, the estimated 2007 can replace incandescent tungsten light bulbs, but can see the places of high color temperature white light LED is not suitable for the lighting environment atmosphere such as restaurants. Mainly to leisure and residential. In countries with high latitude and low temperatures in winter, low temperature light sources are often used to operate a warm lighting environment. Unless the policy is mandatory, otherwise still has its value of incandescent lamp, incandescent lamp to eliminate environmental pollution should have a strong reason to such outside; at the same time LED itself also has some serious shortcomings, first of all, the LED package into a narrow angle of light distribution is not conducive to the light distribution of large area; secondly, LED process flaws with the formation of the light distribution module earlier damage distribution is not uniform; and the replacement of the single LED inconvenience, product stability and efficiency need to continue efforts to improve, and the fluorescent lamp in 2005 time efficiency has reached 120 lm/W, and the utility of solid amalgam, recycling waste tube has less pollution to the environment problems. So it's not easy for LED to completely replace the fluorescent tube.

LED lamp application has its limitations, it can only be said to have its market, but it is difficult to fully replace all the bright light source. So the announcement of the future LED will replace all of the assessment of light sources, most of them are suspected of violating the market economy, is not conducive to the right of the LED industry, and is a waste of money to mislead people in the research and development on the wrong.

Two, LED application research and development prospects for the application of good brightness

Light: to a plurality of LED modules or high strength LED (high power HB LED) to enhance the light output, showed low illumination and high brightness optical properties, so as to be on the car headlights, to generate 100000 cd/m2 glare brightness, serious harm to the driver eye vision. Indoor lighting: as of 2008 White LED lamp, desktop distance of about 30-45 cm, minimum irradiation range of 40 * 40 cm2 to 500 Lux, the market price is about 5-8 times of energy-saving lamp lamp, 1000 Lux illumination should be more than 10 times, light and serious uneven light distribution, just as long time reading there are difficulties, the application is limited, and LED into the indoor lighting as cast down light or headlight, the light emitting price must fall to the cost of LED is much lower than the cost of the fluorescent lamp, so LED indoor lighting to enter indoor lighting applications have a long way to go. Although the global attention has been paid to the development and application of street lamps, but the lack of an objective and correct assessment, wishful thinking. In the marketing of LED with long life spread competitiveness disadvantage, but the cost and price is still higher than the general light source is more than 10 times, so the LED lighting research and development advantages and need to move in the right direction, it is more important to a more pragmatic assessment.

LED with high brightness, fast response speed and as a signal, billboards, traffic lights, emergency evacuation lighting display, other non reading or visual operation application oriented to expand the brightness of the LED lamp and the application, not only the future of a good, really play the biggest energy saving space.

Source: big business network