According to foreign media reports, hypertension is the main cause of stroke and a major risk factor for cardiovascular disease. So what can people do to lower blood pressure besides medication, diet changes, weight loss, and exercise? Research suggests that LED blue light may help.
A randomized study from the University of Surrey in the United Kingdom showed that 14 healthy male volunteers were exposed to blue light for 30 minutes in one day and then illuminated by another light without blue spectrum for 30 minutes on the second day. It is reported that the wavelength of blue light is about 450 nm, which is similar to the visible blue light wavelength in sunlight.
As a result, they found that exposure did not have any effect under another light, and blue light caused a reduction in systolic blood pressure by nearly 8 mmHg. According to researchers at the university, this phenomenon is similar to the trial of antihypertensive drugs.
In addition, blue light seems to reduce arterial stiffness and increase nitric oxide levels, one of which is a cardiovascular health-related signaling molecule. Researchers believe that blue light can cause the skin to release nitric oxide and let it enter the bloodstream. There, it begins to relax blood vessels, increase blood flow and lower blood pressure.
Professor Christian Heiss of the University of Surrey said that in the absence of drugs, exposure to blue light provides innovative treatment for precise blood pressure control. This is especially helpful for people whose blood pressure is not easily controlled by drugs, such as the elderly.
Related research reports have been published in the European Journal of Preventative Cardiology.
2019年2月17日星期日
2019年1月31日星期四
Lighting affects employee productivity
According to media reports, a survey of 1,000 adults showed that 77% of respondents believe that workplace lighting will affect their productivity, 33% said that it is important to get natural light, and 32% said they Willing to work under artificial lighting that helps increase productivity.
Beyond that, it is worth noting that the vast majority of respondents tend to link the lighting conditions of their offices to their own work output. The survey results show that whether there is or not direct biological effects of light, humans at least psychologically respond to light.
Although the direct link between lighting and productivity has not been absolutely confirmed, relevant evidence and common sense indicate that productivity is significantly increased when workers are more satisfied with lighting conditions.
The findings are important for human lighting. Human lighting In the human-centered lighting design, the set scenes and different levels of illumination are varied within a day to match the human 24-hour circadian rhythm.
One expert said, “There are some smart LED lighting systems on the market that can help achieve the right mix of natural and artificial light, suitable for homes and workplaces.”
People-centered lighting has begun to dominate in the workplace but has made greater progress in the healthcare environment. For example, specially designed LED lighting helps to reduce the drug dependence of mental patients and improve dementia care.
The survey also found that at home, 31% of respondents believe that lighting is very important when creating a relaxed and quiet atmosphere before going to bed at night, and 38% believe that morning bedroom lighting can help them be energized.
Beyond that, it is worth noting that the vast majority of respondents tend to link the lighting conditions of their offices to their own work output. The survey results show that whether there is or not direct biological effects of light, humans at least psychologically respond to light.
Although the direct link between lighting and productivity has not been absolutely confirmed, relevant evidence and common sense indicate that productivity is significantly increased when workers are more satisfied with lighting conditions.
The findings are important for human lighting. Human lighting In the human-centered lighting design, the set scenes and different levels of illumination are varied within a day to match the human 24-hour circadian rhythm.
One expert said, “There are some smart LED lighting systems on the market that can help achieve the right mix of natural and artificial light, suitable for homes and workplaces.”
People-centered lighting has begun to dominate in the workplace but has made greater progress in the healthcare environment. For example, specially designed LED lighting helps to reduce the drug dependence of mental patients and improve dementia care.
The survey also found that at home, 31% of respondents believe that lighting is very important when creating a relaxed and quiet atmosphere before going to bed at night, and 38% believe that morning bedroom lighting can help them be energized.
2019年1月29日星期二
Xiamen's schools implement healthy lighting transformation to reduce myopia rate
The problem of myopia in primary and secondary school students has always been concerned by the society. According to statistics, the myopia rate of primary and middle school students in Xiamen is slightly higher than the national average. The primary school students have a myopia rate of about 50%, junior high school students about 70%, and high school students more than 80%. The high incidence of myopia and the trend of a younger age have seriously affected the physical and mental health of children. At the recent seminar of the light environment and eye health of Xiamen schools, experts proposed to further improve the lighting conditions in the classroom to protect the visual health of children and adolescents.
Qiu Aiming, the chief physician of the Xiamen City Primary and Secondary School Health Care Center, said that the health center collects data of more than 300,000 students each year. The data show that the health problems of Xiamen students are mainly myopia, dental caries (fangs) and obesity. Among them, the problem of myopia is the most prominent. There are many factors that cause myopia. From the research results, the transformation of lighting can significantly improve students' vision.
A study conducted by the Peking University Institute of Child and Adolescent Health showed that the classroom lighting renovation significantly improved the lighting environment of the classroom, to a certain extent, it can prevent the decline of vision of primary and secondary school students and reduce the new incidence of poor eyesight. It is understood that the Wuyuan Experimental School in 2014 changed the lighting of the two classrooms, transforming the original fluorescent lamps into LED lights without stroboscopic flash. In the summer of 2015, all the ordinary classrooms, special classrooms, teacher offices, and conference room lighting were replaced with stroboscopic LED lights. After three years of data comparison, the school’s myopia rate has dropped slightly in schools that have completed the classroom lighting renovation. It can be judged that the myopia rate has a lot to do with the lighting environment.
It is understood that more than 50 schools in Xiamen have implemented the healthy lighting environment renovation project.
Qiu Aiming, the chief physician of the Xiamen City Primary and Secondary School Health Care Center, said that the health center collects data of more than 300,000 students each year. The data show that the health problems of Xiamen students are mainly myopia, dental caries (fangs) and obesity. Among them, the problem of myopia is the most prominent. There are many factors that cause myopia. From the research results, the transformation of lighting can significantly improve students' vision.
A study conducted by the Peking University Institute of Child and Adolescent Health showed that the classroom lighting renovation significantly improved the lighting environment of the classroom, to a certain extent, it can prevent the decline of vision of primary and secondary school students and reduce the new incidence of poor eyesight. It is understood that the Wuyuan Experimental School in 2014 changed the lighting of the two classrooms, transforming the original fluorescent lamps into LED lights without stroboscopic flash. In the summer of 2015, all the ordinary classrooms, special classrooms, teacher offices, and conference room lighting were replaced with stroboscopic LED lights. After three years of data comparison, the school’s myopia rate has dropped slightly in schools that have completed the classroom lighting renovation. It can be judged that the myopia rate has a lot to do with the lighting environment.
It is understood that more than 50 schools in Xiamen have implemented the healthy lighting environment renovation project.
2019年1月27日星期日
New discovery! LED can improve health
It is reported that Sandia National Laboratory researchers said that this kind of LED lighting is currently only in the initial stage, its light can be used as a signal for specific physiological responses of humans and plants. In short, LEDs offer many advantages for health, and this has not been discovered before.
Researchers said that the control of the time, space and spectral content of LED luminaires (which they call "engineering light") can trigger a variety of hormonal responses that can help regulate human health and productivity. Specific LED light wavelengths and intensities can also effectively stimulate plant growth, alter plant shape and increase its nutritional value. This will bring new possibilities for indoor planting.
Researcher Jeff Tsao said that this approach is not to ignore the convergence of LED and Internet of Things (IoT), LED has now integrated with the electronics, sensor and communications industries. The ever-expanding use of LEDs will bring greater value to society, far exceeding the energy saved by the housing and architectural lighting.
Researchers said that the control of the time, space and spectral content of LED luminaires (which they call "engineering light") can trigger a variety of hormonal responses that can help regulate human health and productivity. Specific LED light wavelengths and intensities can also effectively stimulate plant growth, alter plant shape and increase its nutritional value. This will bring new possibilities for indoor planting.
Researcher Jeff Tsao said that this approach is not to ignore the convergence of LED and Internet of Things (IoT), LED has now integrated with the electronics, sensor and communications industries. The ever-expanding use of LEDs will bring greater value to society, far exceeding the energy saved by the housing and architectural lighting.
2019年1月24日星期四
How to identify whether a copper bracket or an iron bracket in the LEDs
The bracket is one of the most important components in SMD LED. The copper bracket has high thermal conductivity and heat dissipation, which is not easy to rust. The electrical conductivity of the iron bracket is poor, the heat dissipation is low relative to copper, and it is easy to oxidize and rust.
Many people think that magnets can be used to distinguish between iron brackets and copper brackets. In fact, there are two plating materials for the copper brackets, silver and nickel. This method will not work because nickel is attracted by a magnet
Copper has good thermal conductivity and heat dissipation ability, but it is easy to be corroded in the damp environment. Silver is used to increases the adhesion between the chip and the bracket. Moreover, due to the silver is a highly reflective material, the silver-plated layer is able to reduce light loss and increases reflection. Nickel is an approximately silver-white, hard and malleable material that is highly polished and resistant to corrosion and reduces undesirable reactions such as vulcanization. Therefore, it can be used in the copper brackets to prevent copper from migrating to the silver, and increase the strength of the brackets.
Therefore, the best way to identify the materials of the brackets is breaking the bracket. If the cross-section is purple and red, it is the copper bracket. If the color is silver and gray, it is the iron bracket.
Many people think that magnets can be used to distinguish between iron brackets and copper brackets. In fact, there are two plating materials for the copper brackets, silver and nickel. This method will not work because nickel is attracted by a magnet
Copper has good thermal conductivity and heat dissipation ability, but it is easy to be corroded in the damp environment. Silver is used to increases the adhesion between the chip and the bracket. Moreover, due to the silver is a highly reflective material, the silver-plated layer is able to reduce light loss and increases reflection. Nickel is an approximately silver-white, hard and malleable material that is highly polished and resistant to corrosion and reduces undesirable reactions such as vulcanization. Therefore, it can be used in the copper brackets to prevent copper from migrating to the silver, and increase the strength of the brackets.
Therefore, the best way to identify the materials of the brackets is breaking the bracket. If the cross-section is purple and red, it is the copper bracket. If the color is silver and gray, it is the iron bracket.
2019年1月22日星期二
LED plant lights help French growers to increase cucumber production
A few days ago, Signify issued a press release announcing that two French vegetable growers have installed Signify's LED garden lighting in their greenhouses to help grow cucumbers throughout the year.
According to the company, Jardins Réunis and Cheminant installed the Philips GreenPower series of plant lights LED Toplight and LED Interlight in their new cucumber greenhouse (located in the Nantes region of France). The two are the first growers in France to use LED lamps to grow steel cucumbers, demonstrating their leadership as a member of the Océane grower cooperative.
Signify pointed out that LED grow lighting can help increase crop yields, and also allows growers to control light and temperature more precisely because LEDs do not generate excessive heat as the light increases. These features ensure the high-quality production of the crop throughout the year as efficiently as possible.
Antoine, a co-owner of Cheminant, said that LED plant lights provide better heat and light balance. Compared to high-pressure sodium lamps, LED lights can greatly increase production without generating heat. According to the calculation, Cheminant's 20,000 square meters semi-enclosed greenhouse is illuminated with LED lights, and the output will be 30% higher than the output of traditional greenhouses without LED grow lights.
Vincent Olivon, co-owner of Jardins Réunis, said that the planting experts can provide good advice and support. LED lighting will help companies improve energy efficiency and reduce production gaps, especially in the winter when revenues are greater. This plays a key role in maintaining the company's position in the market throughout the year.
It is reported that similar to Jardins Réunis and Cheminant, a French Philips Horti LED certified partner Eiffage énergie Systèmes installed Philips LED Toplight (145 μmol/s/m2) and LED Interlight in its 25,000 m2 greenhouse in November 2018. (67 μmol/s/m2).
According to the company, Jardins Réunis and Cheminant installed the Philips GreenPower series of plant lights LED Toplight and LED Interlight in their new cucumber greenhouse (located in the Nantes region of France). The two are the first growers in France to use LED lamps to grow steel cucumbers, demonstrating their leadership as a member of the Océane grower cooperative.
Signify pointed out that LED grow lighting can help increase crop yields, and also allows growers to control light and temperature more precisely because LEDs do not generate excessive heat as the light increases. These features ensure the high-quality production of the crop throughout the year as efficiently as possible.
Antoine, a co-owner of Cheminant, said that LED plant lights provide better heat and light balance. Compared to high-pressure sodium lamps, LED lights can greatly increase production without generating heat. According to the calculation, Cheminant's 20,000 square meters semi-enclosed greenhouse is illuminated with LED lights, and the output will be 30% higher than the output of traditional greenhouses without LED grow lights.
Vincent Olivon, co-owner of Jardins Réunis, said that the planting experts can provide good advice and support. LED lighting will help companies improve energy efficiency and reduce production gaps, especially in the winter when revenues are greater. This plays a key role in maintaining the company's position in the market throughout the year.
It is reported that similar to Jardins Réunis and Cheminant, a French Philips Horti LED certified partner Eiffage énergie Systèmes installed Philips LED Toplight (145 μmol/s/m2) and LED Interlight in its 25,000 m2 greenhouse in November 2018. (67 μmol/s/m2).
2019年1月20日星期日
What is the difference between a copper bracket and an iron bracket?
At present, there are many kinds of LED products on the market, and the products with the same brightness and parameters may have different prices. The main reason for the difference in price is the difference in their materials. Today we will introduce two main metal brackets in the LED strip lights' industry: copper brackets and iron brackets.
The SMD LED bracket is formed by PPA and metal. Normally, the bracket will be plated with silver to facilitate the light and connect with the LED gold wire. The functions of the bracket are carrying the chips, conducting the current, increasing the heat dissipation and protecting the internal structures.
At present, the copper brackets and the iron brackets are the two main metal brackets in the industry. The resistivity and thermal conductivity of copper are 1.678 and 401 that are better than that of the iron's 9.71 and 80. We all know that the temperature is one of the major factors affecting the LED's life. The resistivity and the thermal conductivity of the bracket directly affect the lifespan of LED. The lower the LED resistivity, the higher the LED electro-optical conversion efficiency, the smaller the heat generation. The higher the LED thermal conductivity, the better the cooling effect.
It can be seen that the copper bracket is better than the iron bracket in quality. Besides, the high ductility of the copper brackets will also reduce the death rate of LEDs. Furthermore, due to the iron is easy to rust, once the iron is rusted, the silver-plated layer will fall off and the LED will be broken.
The SMD LED bracket is formed by PPA and metal. Normally, the bracket will be plated with silver to facilitate the light and connect with the LED gold wire. The functions of the bracket are carrying the chips, conducting the current, increasing the heat dissipation and protecting the internal structures.
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| The bracket of SMD LED |
At present, the copper brackets and the iron brackets are the two main metal brackets in the industry. The resistivity and thermal conductivity of copper are 1.678 and 401 that are better than that of the iron's 9.71 and 80. We all know that the temperature is one of the major factors affecting the LED's life. The resistivity and the thermal conductivity of the bracket directly affect the lifespan of LED. The lower the LED resistivity, the higher the LED electro-optical conversion efficiency, the smaller the heat generation. The higher the LED thermal conductivity, the better the cooling effect.
It can be seen that the copper bracket is better than the iron bracket in quality. Besides, the high ductility of the copper brackets will also reduce the death rate of LEDs. Furthermore, due to the iron is easy to rust, once the iron is rusted, the silver-plated layer will fall off and the LED will be broken.
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