Professor Zhang Shanduan: 4 indicators of modern green lighting hard indicators

It is reported that Zhang Shanduan, vice president of Fudan University, Department of light and lighting engineering is involved in writing the China Institute of lighting, China's green lighting development strategy report. In December 20th, the "2012 China Senior lighting designer forum", he published a number of views on green lighting. He believes that the evaluation indicators of green lighting in general there are four: energy saving, environmental protection, safety, comfort. The most important thing is safety.

Energy efficiency indicators include light efficiency, life, luminous flux maintenance rate. Environmental indicators are low emissions of harmful substances, as well as the consumption of electricity during the use of about how much. The carbon footprint is carbon emissions caused by production, transportation, consumption and waste disposal. "Europeans can calculate the carbon footprint by considering the use of carbon tax to assess lighting products. He said. The security aspect, the first is the electrical safety, followed by bio safety, such as UV damage, blue light damage. Comfort indicators have color temperature, color rendering index, DUV, SDCM, UGR, etc..

Indicator 1: energy saving (light efficiency, life, luminous maintenance rate)

1 light effect: unsaturated ceramic gold halogen lamp 2015-2020 production may be expensive

Zhang Shanduan detailed evaluation of the contents of the four indicators, in terms of energy saving, he predicted the 2015-2020 trend of light efficiency. At present, foreign countries are keen to improve the halogen tungsten light effect, is expected to achieve 30-40lm/W. He believes that if you can reduce the cost of infrared coating, halogen tungsten lamp can replace incandescent. Fluorescent lamp with T8 straight tube light efficiency of up to 120lm/W, CFL has reached 85lm/W. In foreign countries, the effect of the high pressure sodium lamp has not been improved, and the lighting effect of the 250W high pressure sodium lamp can be achieved by using the burning electrode in China 160lm/W. In 2015-2020, the saturation of the ceramic metal halide lamp may be produced, its color index is 98, the spectrum is close to the black line, but the price is more expensive, because the sealing material used precious metal iridium. He said, probably in 2020, and now a single light-emitting area of 1mm2, current 350mA, power 1W LED, can be achieved current 1.5A, power 4W or more, warm white light efficiency up to 150lm/W, cold white light effect will reach 180lm/W.

2 life: LED lighting 10 thousand hours life is more appropriate

For life, Zhang Shanduan talked about, fluorescent lamp has reached 16 thousand hours in the survival rate of, high pressure sodium lamp 2.5-3 hours, ceramic gold halogen lamp 1.5-2.5 hours. LED according to the manufacturer's argument, now LED life 2-3 million hours, or even 35 thousand hours, he questioned: "so long has no meaning? Especially for family or commercial lighting, life is more than 5 years and have no meaning, more than 10 years of home renovation. He also suggested that the international electric light source of the chairman of the Committee RobinDevonshire made a prediction, LED life over 25 thousand hours and continues to improve, in accordance with the development of this trend, in 2017 sales of LED will be reduced, because the lamp life is too long, the number needed to replace the lamp is reduced. This is not good for the sustainable development of the lighting industry, I personally think that the lamp life of 10 thousand hours is more appropriate. "

3 flux maintenance: the future will reach a higher level

Zhang Shanduan believes that the maintenance rate is very important. "My light is very good, but it decays quickly. Good fluorescent lamp is 16 thousand hours to maintain the rate of 90%, sodium lamp can reach up to 20 thousand hours of 90%, ceramic metal halide lamp is 20 thousand hours per hour. He said that now the country's tender documents on the requirements of LED is 10 thousand hours to maintain the rate of 86%. From the actual measurement results, Fudan University also installed dozens of LED street lamp, 5000 hours luminous maintenance rate of 93%. He predicted that the future of light efficiency, luminous maintenance rate can be done relatively high, the overall trend is the development of traditional light will be slower, LED process will be faster.

Indicator two: environmental protection (low harmful emissions, carbon footprint)

1 misunderstanding of the fluorescent lamp

Myth: electromagnetic radiation exceeded

In terms of environmental protection, Zhang Shanduan hope in the light of the manufacture, transportation, use, the process of the elimination of harmful substances as little as possible. "Here are some misconceptions about fluorescent lights. The first is the electromagnetic radiation problem. At the beginning of this year, Shanghai Oriental Television station to find a non professional people took the high-frequency equipment to test, a test of high energy electromagnetic radiation. Later, Shanghai's national electric light source quality supervision and inspection center from the market to buy a lot of energy-saving lamps for testing, the results do not have any problems. Why is there such a big problem with the electromagnetic radiation of the energy saving lamps in front of the non - professionals because of the problems of the test equipment and test methods. According to Yu Anqi, director of the Shanghai Institute of lighting, energy saving lamps and HID electromagnetic radiation are very small. "

Myth two: mercury pollution

The second is the problem of mercury pollution. He said that if the fluorescent lamp is filled with liquid mercury, and from the energy-saving lamp or straight tube fluorescent lamp leakage, then the indoor mercury concentration will be exceeded. A few years ago, there is a fluorescent lamp manufacturing enterprises have dozens of kilograms of mercury leakage, and some workers have a mercury poisoning, after the production line shutdown for a few months, all changed to mercury filled. He explained that now the domestic energy-saving lamps have been used to fill the solid mercury, if the mercury into the air, the release of mercury concentrations in the national security. At present, the mercury content of fluorescent lamp has been very low, the domestic energy-saving lamp with high performance can be controlled to 0.8 mg, lamp life can still reach 8000-10000 hours, so after the mercury pollution problem should not be the reason of LED attack fluorescent lamp.

2 carbon footprint: light source industry has not enough parameters

The "carbon footprint in Europe are advocating, is from the production, transportation, consumption and waste treatment process caused by carbon emissions, such as manufacturing with energy, when processing and recycling to use energy, they will measure into carbon emissions. He said that in the light industry has not calculated in this regard. Let my graduate students have done research and found that many parameters can not get, is still not. "

3 carbon reduction: carbon dioxide is a secondary factor

On the purpose of carbon reduction, Zhang Shanduan believes that the first is energy, in fact, to reduce the pressure on our country's energy, whether imported or their own mining. "Carbon dioxide is now considered to be a major factor in the rise of the earth's temperature, but there is still a lot of debate on scientific evidence. He is more inclined to carbon dioxide is a secondary factor, the sun's cyclical activities caused by the earth's temperature rise is the primary. He suggested that we recognize that Europe and the United States are turning carbon emissions into carbon politics and Wall Street's Carbon Finance

Safety and comfort index

Indicator three: Safety (electrical safety, bio safety)

Regarding safety, electrical safety is primary. There is also a bio security, including UV, blue, near infrared damage, as well as non visual biological effects. "Last year we according to the preliminary test results, found that if not handled, Blu ray dose transparent LED is certainly exceed the standard, only the frosted incandescent lamp, with diffusion light low temperature LED to meet the safety requirements of blue. Non visual biological effects have not been clearly defined. He said.

Index four: comfort (color temperature, color rendering index, DUV, SDCM, UGR, color parameters of life to maintain)

Comfort index, human adaptation to continuous spectrum. Color temperature to consider the application and the needs of human physiological rhythm. LED color rendering index if you want to do more than 90, need to add red chip.

In addition, there are indicators of comfort DUV, standard color difference, glare, and color parameters to maintain life. During the life of the color temperature, standard color must be stable.

Zhang Shanduan also proposed to determine the lighting comfort which parameters need to be the first one is R9>0, the second is the strobe problem. He said: at present there is a new high voltage LED program, do not drive, after the power rectifier is used directly to point LED lights, there may be the problem of 100Hz strobe. There is also a degree of uniformity, diffusion, and even a more physical concept - the degree of polarization, coherence, which needs to continue to study. This depends on the lighting experts and researchers who work hard to see the light source, to see if we can feel comfortable quantitative, later to take these measures to assess. "

Finally, he put forward some problems: "LED can conquer the world?" he personally thought impossible. The glare control of LED lamps is worthy of study. In addition, the quality of the general LED can make good lighting, such as the use of different parameters of the LED package, through sorting, color temperature, DUV, SDCM consistent lamps, which is a low-cost solution.