LED light efficiency boost driven by lower cost LED lighting optimistic outlook

LED luminous efficiency hit a new high

Comparison of LED extraction efficiency in different countries at present. In the laboratory, with high power, chip size of 1 mm2, the input current of 350 Ma case, currently in the United States CREE Corp. (CREE) is most proud of the achievements, the company announced in early December 2009, the white LED luminous efficiency is up to 186 lumens per watt of success, and commercial products are part of. To provide customers the total luminous flux of 139 lumens, a luminous efficiency of 132 lumens per watt products in the third quarter of 2009.

Source: industry, PIDA (10/2009) LED in luminous efficiency in the laboratory and commercial

As for the Nichia (Nichia) on February 2009 Photonis West announced the exhibition has successfully developed a small power industry's highest flux white LED chip. The white LED Nichia published, at 20 mA current, the luminous efficiency of up to 249 lumens per watt, is currently the industry's most. And in the development of small power LED Nichia has maintained a leading position on the global, the company in December 2006, the luminous efficiency of 150 lumens per watt, September 2007 up to 169 lumens per watt, now up to 249 lumens per watt.

Compared with other traditional light source technology development has matured, LED luminous efficiency remain to be improved, in terms of analysis at this stage of technological development of various manufacturers, although only CREE can provide the manufacturers in 2009 132 lumens per watt, but according to the U.S. Department of energy (DOE) prediction (Figure 3), 2015 LED monomer with luminous efficiency the opportunity to ascend to 188 lumens per watt, warm light will also have the opportunity to achieve 138 lumens per watt results, if plus the whole lamp lighting efficiency, LED will become the general lighting opportunities have been relatively enhanced.

LED prices will decline rapidly

In addition, thinking from the lighting costs, and discharge lamp, fluorescent lamp, incandescent lamp, and high intensity discharge (HID) compared with the traditional light source, the unit cost compared to the LED lamp has no decline in space, and the LED light source from 4100 to 6500K from 2009 to estimate the cost per thousand lumens of approximately $25, fell sharply more than 90% lumens per 1000 $2 level.

In the lighting market as an example, according to the general industry cognition, new light source to cut into the general lighting market at the cost of at least $5 per thousand lumens, only relatively competitive, therefore, 2012 to 2013 years, LED lighting can be comparable to the traditional light source in general cost. If the LED luminous efficiency can be estimated, such as the U.S. Bureau of energy, then to 2015, LED only $2 per thousand lumens, cut into different lighting opportunities are bound to increase.

The development of LED lighting manufacturers have been launched so far, the luminous efficiency of 130 lumens per watt LED above 70%, if the performance and the current average efficiency 50 to estimate, LED lighting efficiency of at least 65 lumens per watt, for key lighting, or replace the disable incandescent lights, all have market entry qualification.

As for the indirect lighting or the final main lighting market, in addition to the LED technology itself must be upgraded, the price decline, improve the efficiency of lighting and the advantages of the traditional light source for LED lighting in the future must face the problem.

According to the photoelectric Association (PIDA) analysis, at this stage, LED will play local lighting or lighting is a key role, estimated 2012 LED have the opportunity to cut indirect lighting, but if LED TV in the past 1 to 2 years will be accepted by the market, the price is LED component in economies of scale in the industry, the cost will be decreased rapidly, as the main the lighting time is expected to happen in advance.

LED lighting applications in the next few years, LED will quickly cut into the application market, such as street lights, commercial shop lighting and LED eventually into the residential lighting.

The government pay the first appearance of lamp applications

Road lighting requirements must take into account the visibility, inducing factors, visibility and comfort, in recent years, the overall urban landscape design concept popular, light pollution damage, energy-saving lighting issues on the environment caused by the influence of attention, become incentives to promote LED light source lamp applications market entry.

At present, in the choice of the source of the road lighting, HID lamp based, in which the number of types of light source used to subdivide, the most commonly used for high pressure, and then for the mercury lamp, and then it is a metal lamp.

The first is the technology development situation, the efficiency of high power LED uneventfully on starting street market, but LED is a semiconductor material, the input power can be more than 80% will be converted into heat energy, the characteristics of luminous efficiency with temperature rise and decline of the chip, solve the problem of heat dissipation is LED lamp must now in the application to overcome.

In addition, the optical design is various manufacturers to overcome the challenges, as for other needs such as LED DC drive, so the selection and arrangement of the power supply is the key technology, at the same time, wind resistant, resistant to lightning, vibration resistant safety, increased LED lamp design challenges.

Based on safety considerations, street lighting has a set of rules that must be followed, in accordance with the different regional and road conditions, different countries have different requirements for illumination, illuminance uniformity and glare. At present, these standards have been released, in addition to the United States DOE proposed LED lamp specifications for outdoor lighting, in 2009 Taiwan efforts also announced the first set of LED lighting standards, namely the national standard (CNS) No. 15233 "LED street lighting standards".

Although from the beginning of the end of 2007, the market continued to spread the message received by the manufacturers LED street lamps