Can UV-LED lights effectively kill the coronavirus?

Disinfection of contaminants remains an important public health measure to reduce the spread of various infectious diseases, especially during the COVID-19 pandemic. In addition, researchers are also actively developing more efficient disinfection techniques, especially for high-traffic public places.

Can UV-LED lights effectively kill the coronavirus?

Ultraviolet (UV) light has previously been identified as a useful method of disinfection and has been shown to be effective in inactivating a wide variety of microorganisms. The advent of UV light-emitting diodes offers the advantage of ease of disinfection, as germicidal UV light can be provided using the same lighting units that provide standard white light to illuminate a room.

Scientists at the University of Toronto’s Scarborough campus have demonstrated the effectiveness and feasibility of UV light-emitting diodes as a means of purification by inactivating two different virus models: human coronavirus 229E and human immunodeficiency virus (HIV). Alternate between white light and germicidal ultraviolet (UV) light. With inexpensive retrofits, they can also be used in many standard lighting fixtures, bringing a “unique appeal” to public spaces, said Christina Guzzo, senior author of the study.

“We are at a critical juncture where we need to use every possible stop to get us out of this pandemic,” said Guzzo, an associate professor in the school’s Department of Biological Sciences. “Every mitigation strategy that can be easily implemented should be used.”

UV lamps kill viruses through radiation. Along with doctoral students Arvin T. Persaud and Jonathan Burnie, Guzzo first tested the lamp on bacterial spores known for their resistance to this radiation, known as Bacillus pumilus spores.

“If you can kill these spores, then you can reasonably say that you should be able to kill most other viruses that you regularly encounter in the environment,” Guzzo said.

Within 20 seconds of UV exposure, spore growth decreased by 99 percent.

The researchers then created droplets containing the coronavirus or HIV to simulate the typical way people encounter the virus in public, such as from coughing and sneezing. The droplets were then exposed to UV light and placed in a culture to see if any virus remained active. After just 30 seconds of exposure, the virus’s ability to infect was reduced by 93 percent.

When testing different concentrations of the virus, they found that samples with more viral particles were more resistant to UV light. But even with such a high viral load (which Guzzo called a “worst-case scenario”), infectivity dropped by 88%.

Although not included in the study, Guzzo and her students also compared UV light to two heavy-duty disinfectants used in the lab study. They found that the lights had a similar effect in their ability to inactivate the virus.

LED luminaires with new installations are the main growth factor

According to a report by market research agency MarketsandMarkets, by 2023, the global outdoor LED lighting market value will reach US$21.95 billion, and will grow at a compound annual growth rate of 13.7% during the forecast period from 2017 to 2023.


The growth of the outdoor LED lighting market can be attributed to the increasing demand for outdoor visibility, the need to ensure the safety of drivers and passersby, and the modernization of infrastructure. In addition, factors such as low energy consumption and high cost-effectiveness of LEDs have also contributed to the growth of the global outdoor LED lighting market.

From 2017 to 2023, LED luminaires with new installation methods will be a major factor driving the growth of the outdoor LED luminaires market.

Outdoor LED lighting fixtures with new installation methods have the advantages of long service life and energy saving, so they are very popular among consumers. Despite the high cost of outdoor LED lighting technology, installation and maintenance costs are relatively low.

Luminaires ranging from 50 watts to 150 watts will help boost the growth of the LED lighting market during the forecast period. The reason for such market growth can be attributed to the increasing adoption of LED outdoor lighting, which is energy-efficient and low-maintenance, outdoors around the world. Such LED outdoor lighting fixtures are mainly used on highways and roads.

During the forecast period, the outdoor LED lighting market in the Asia-Pacific region will witness a high CAGR. The growth of the market in this region can be attributed to the modern infrastructure development and optimization of cities. Countries and regions like Australia, Taiwan, Singapore, and Vietnam are experiencing huge economic growth and urbanization, which has greatly increased the demand for outdoor LED lighting systems in these countries.

Audi LED headlights are at the forefront of the times

With the advent of LED technology, Audi launched its first all-LED headlight in 2008. The light-emitting diode technology not only greatly improves the efficiency, projection range, and lighting function of the headlight, but also gives the light a higher degree of freedom in modeling design. With the technological evolution of the times, Audi launched Matrix LED headlights, Laser headlights, and OLED taillight technology in 2013, which have been widely used in Audi models so far.

Audi LED headlights are at the forefront of the times

2020 Digital Matrix LED digital matrix headlights are used in Audi e-Tron models for the first time. Audi’s engineering team not only has more advanced lighting technology in Audi lighting but also a dynamic projection lighting display when returning home/leaving home, making the lighting exclusive to the new generation of customers experiencing a link; taillights are also going digital. Digital OLED taillight technology uses curvilinear characteristics and three-dimensional light group structure to further communicate with the outside world. The light sources of the Digital OLED light group will all light up to warn people and vehicles behind to pay attention, bringing a safer driving experience. At present, this function has been installed on the Audi Q5 and Audi A8 models.

With the evolution of digital lighting, lighting is not only lighting for Audi, but also a medium of communication to achieve driving safety. Through exclusive lighting interaction, each car model is given a unique lighting shape and a personalized driving experience. Looking forward to the future, the Audi R&D team will continue to create more lighting functions, and gradually perform them in the Audi sphere series of concept cars, such as lighting canvas, light and shadow welcome red carpet, and then to Car-to-X communication and other future feasibility. With digital lighting technology integrated into design aesthetics, driving safety, and external road communication, Audi continues to create innovative mobile experiences.

Sustainable LED lighting could improve city safety

Safety is the number one concern for most people, but about 60 percent feel unsafe walking at night in their community. Investing in lighting that is both environmentally friendly and crime deterrent is a win for any community.

Sustainable LED lighting could improve city safety

Overall, sustainable lighting is a better choice and the community will see the difference after the change.

Brighter than regular LED lights, LED lights can increase productivity and keep people awake, making them a great choice for everything from home offices to dark street corners. Bright lights mean better street lighting, making people feel safer walking home.

With brighter lights, people don’t have to worry about crime. The brightness of the LED lights can help victims identify attackers to deter crime or allow security cameras to capture the facial features of potential criminals. LED lights are also a great way to prevent corruption in your community and make a place safer.

Humans respond to light, and more people are active during the day than at night, but bright city streets can feel like there’s the activity or someone is in the area. With more people around, few criminals would consider attacking.

Even if a community doesn’t want to keep those street lights on all night, they can still reap the safety benefits of switching to LED lights.

The community can take advantage of the brightness of LED lights by incorporating smart controls. Smart controls can flash streetlights when someone nearby needs help, which is great for first responders and first responders who may be searching in the dark.

Overall, smart devices can improve energy efficiency in buildings and outdoors.

New Beihuan River Expressway Replacement LED Lamps

To implement energy saving and carbon reduction, the New Taipei Maintenance Office will handle the LED lighting replacement project on the New Taipei Huanhe Expressway and the Sanchong to Banqiao section for five days on March 1st, 4th, 5th, 7th, and 8th, from 0:00 a.m. to 6:00 a.m. every day, some of the ramps will be closed in turn. The Maintenance Department pointed out yesterday (28th) that the replacement of street lamps will make the nighttime lighting brighter and ensure the safety of passers-by. Please cooperate with diversions when passing by.

New Beihuan River Expressway Replacement LED Lamps

The new Beihuan Express LED lighting replacement project is carried out in five stages. The closed road sections and diversion routes in each stage are as follows: In the first stage, the Sanchonghuanhe Road to Banqiao ramp and the Banqiao Huanhe West Road to Banqiao ramp will be closed on March 1. Bridge and Dahan Bridge pass. In the second stage, on March 4, Banqiao Huanhe West Road will be closed to Sanchong, and Banqiao to Sanchong will be closed. Vehicles should be diverted to Dahan Bridge and re-bridge. In the third stage, on March 5th, the Xinbeihuan Express Ramp on Xinzhuang Huanhan Road will be closed. Vehicles heading towards Banqiao should be diverted to Dahan Bridge. Vehicles heading towards Sanchong may be diverted to re-bridge or pass through Dahan Bridge to Banqiao Huanhe West Road Ramp and go to Xinbei Ring Road Hurry up; at the same time, the ramp from Sanchong Chongjin Street to Banqiao Shangqiao is also closed. For vehicles, please take Sanchong Huanhe Road to the Chenggong Road ramp. In the fourth stage, the Xingzhuang Huanhan Road ramp will be closed on March 7. Vehicles from Banqiao to Xinzhuang can be diverted to Dahan Bridge, and vehicles from Sanzhong to Xinzhuang should be diverted to the new bridge; at the same time, the Xinbei Ring Express to Sanzhong will be closed. Get off the ramp on Fud South Road. Vehicles please turn around and pass through the ramp on Sanzhong Longmen Road.

Shenzhen releases certification standards for MiniLED indoor commercial displays and other certification standards for the whole country

On July 20, the Shenzhen Municipal Market Supervision and Administration Bureau organized and held the Shenzhen Standard Quality Forum of “Deep Standard and High Quality”. At the meeting, the second batch of intelligent display terminal product catalogs was released simultaneously, and the pilot application for Shenzhen standard certification was opened to the whole country. The second batch of intelligent display terminal products that can be declared this time include a Mini LED indoor commercial display, handwriting and painting equipment, and a laser digital movie projector.

Shenzhen releases certification standards for MiniLED indoor commercial displays and other certification standards for the whole country

Among them, “Shenzhen Standard Advancement Evaluation Rules: Mini LED Indoor Commercial Screen” was proposed by Shenzhen Lighting and Display Engineering Industry Association to Shenzhen Standard Advancement Evaluation Organization. With the strong support of leading LED display companies such as Sen, Huaxing, Lehman, etc., they conducted in-depth discussions with experts on the key indicators of the detailed rules. The determining key indicators include brightness uniformity, color coordinate deviation, color gamut, coincidence, gray level, refresh frequency, horizontal brightness viewing angle, vertical brightness viewing angle, energy consumption requirements, ink color consistency/surface color difference, flatness, pixel center distance relative deviation, horizontal cross-border dislocation, vertical cross-border dislocation, and other requirements.

This “Shenzhen Standard Advanced Evaluation Rules: Mini LED Indoor Commercial Screen” is suitable for Mini LED chip size less than 200um, the pixel pitch range of 0.3 ~ 1.5mm, working in an indoor environment of 0 ~ 40 ℃, humidity below 85%, an ultra-high-definition display with Mini LED direct display solution. The main contents include but are not limited to main technical indicators determination procedures, main technical indicators, advanced judgment standards, advanced evaluation procedures, etc.

“Shenzhen Standard” of Mini LED

The LED display industry belongs to the ultra-high-definition video display industry cluster in Shenzhen’s “20+8” action plan. The Shenzhen LED industry was once synonymous with LED in China, because it has a complete industrial chain, the largest LED packaging and display production base in China, and the largest industrial cluster of LED listed companies in the country.

At the same time, the “Shenzhen Standard” will be based on the principle of leading domestic and international advanced level or filling domestic and international gaps. On the basis of relevant requirements such as “Test Methods for Light Emitting Diode (LED) Display Screens”, technical indicators of eight dimensions are proposed for product quality (for details, see Appendix 1 at the end of the article):

1. Product innovation can further meet customer needs and open up new markets;

2. In line with the direction of industrial policy guidance;

3. Fill in the domestic (international) gap and improve product quality;

4. Strictly higher than the national industry standards, the quality has improved significantly;

5. Cleaner production, material selection, and eco-friendly production process;

6. Product safety, health and environmental protection, maintain human safety, benefit physical health, and strengthen environmental protection;

7. Consumer experience, meet the actual needs of consumers, and improve user experience;

8. The special requirements of the industry are in line with and higher than the special requirements of the industry where the product is located, driving the quality to improve significantly.

Australia and New Zealand implement mandatory safety certification for LED bulbs and night lights

Recently, the Australian and New Zealand Bureau of Standards released AS/NZS 4417.2:2012 The fourth edition of the revised standard for electrical and electronic products compliance marking standard A4:2017. The revision expanded the list of regulated products, reclassified the security levels of some products, and updated the definitions of some products.

Australia and New Zealand implement mandatory safety certification for LED bulbs and night lights

It is worth noting that this revision adds 6 categories of products such as LED bulbs and night lights to the scope of compulsory certification products. The standard stipulates that from June 1, 2018, products such as LED bulbs and night lights entering the Australian market must first apply for a mandatory safety certificate (ie SAA certification).

The specific content of this revision includes: First, the new Australian Level 3 mandatory control products: In addition to LED bulbs and night lights, electric heating water bags, DC isolators, glue guns and flexible electric blankets (quilts) will also be available in 2018. It will be enforced from June 1; the second is to add New Zealand Level 2 products: balance vehicles, DC/AC electric vehicle (EV) charging piles, cable assemblies, belt control and protection devices, these types of products since June 2017 From the 30th, if it is sold to New Zealand, at least relevant test reports that meet the standards must be provided (you can also apply for a safety certificate). / The three categories of products such as scrubbers and TV receivers have been downgraded from Level 3 products in Australia to Level 2 products, and have been deleted from the New Zealand Level 2 list; the fourth is product definition update: product descriptions such as flexible heating pads, therapy lamps and wall switches Also updated in this revision.

It is reported that SAA Australian International Standards is the only standards certification body in Australia. Whether it is imported or locally assembled electrical products in Australia, before entering the Australian market, they must first pass the certification of the Australian International Standards Company. Due to the mutual recognition agreement between Australia and New Zealand, all products certified by Australia can smoothly enter the New Zealand market for sale. There are two main types of SAA marks, one is formal approval and the other is standard mark. Formal certification is only responsible for samples, while standard marks need to be inspected one by one.

The expansion of the product range of Australia’s compulsory safety certification will greatly increase the production and testing costs of enterprises; once the product quality does not meet the standard requirements, it will be randomly checked and notified by the Australian market, which will cause enterprises to suffer economic losses.

The inspection and quarantine department reminds the relevant lighting manufacturers that export to Australia: pay attention to the revision of the standards for electrical and electronic products in Australia, study and study the new standards, and do a good job in responding to technical trade measures, so as to know what to do.

LED lighting can be used in X-ray radiation environments

RIKEN (RIKEN) Radiation Photon Science Research Center SPring-8 Repair Research Group Director Hitoshi Tanaka Group Director, High Brightness Photon Science Research Center Accelerator Department Director Takahiro Watanabe, Quantum Science Technology Research and Development Organization Next Generation Radiation Facility Development and Development Joint Research by the Center The research team led by Nobuyuki Nishimori, the team leader, investigated in detail the process of LED lighting failure in the radiation environment caused by X-rays, and even in such a special environment, stable, long-life commercially available LED lighting I found a kind of LED lighting that can be used. method.

LED lighting can be used in X-ray radiation environments

The results of this study are expected to contribute not only to the greening of the 3GeV next-generation synchrotron radiation facility, but also to the large-scale synchrotron radiation facility “SPring-8” and similar facilities around the world.

Because the interior of the accelerator tunnel is exposed to intense radiation, LED lighting fails in a short period of time, so there has been no progress in replacing traditional fluorescent lamps with LED lighting.

This time, the joint research group used SPring-8 and the X-ray irradiation device of the RIKEN Radiation Photon Science Research Center to conduct a detailed investigation of the process of X-ray irradiation leading to the failure of LED lighting. Later, it was found that the MOSFET of the LED lighting drive power supply part was broken, and the MOSFET was not directly damaged by radiation but was caused by high temperature caused by thermal runaway. Based on this result, commercial LEDs with high efficiency and high reliability can be obtained by simply moving the driving power of the LED lighting out of the tunnel or turning on the lighting only during use to prevent thermal runaway. Lighting can be used.

The research was published in the online edition of the scientific journal The Japanese Journal of Applied Physics (July 1).

LED grow lights have a great impact on the growth of seedlings

LED light quality has a significant impact on the growth, development, and photosynthesis of plant seedlings. Red light is beneficial to stem elongation and dry matter accumulation of vegetable seedlings, while blue light is beneficial to protein accumulation and promotes the activity of antioxidant enzymes. The combined light is more beneficial to the photosynthesis and growth of vegetable seedlings than single light quality. Ultraviolet radiation can reduce the leaf area per plant, inhibit hypocotyl elongation, reduce photosynthesis and productivity, and make plants vulnerable to pathogens, but can induce flavonoid synthesis and defense mechanisms; it can also significantly reduce soybean plant height, dryness the damage to the photosynthetic pigments of the seedlings is more serious. Blue light can inhibit the elongation of the hypocotyl of red bean sprouts and the elongation of the stems of tobacco seedlings, and reduce the relative growth rate; it has an extremely important effect on the growth of plant leaves and roots and can reduce the leaf area and the number of leaves of lettuce seedlings. It is beneficial to promote the synthesis of nutrients related to flower bud differentiation and flower formation. Greenlight is not an efficient absorption spectrum for photosynthesis, but supplementing green light can synergize with red and blue light to increase the synthesis of pigments, which can significantly increase the plant height and stem thickness of tomato seedlings, and promote the growth of pea sprouts. Red-orange light is beneficial to stem growth and promotes plant flowering and chlorophyll formation shortens the growth cycle and increases soluble sugar content and yield. Far-red light can increase plant dry and fresh weight, stem length, leaf length, and leaf width; however, in many cases, it can counteract the red light effect and reduce anthocyanins, carotenoids, and chlorophyll content. The cucumber seedlings were supplemented with low-intensity blue and red light for two hours in the morning, and it was found that the supplemental light increased the fresh weight, leaf area, and stem thickness of the seedlings. The use of red LED for night-time delayed supplemental light can promote the early growth of cucumber seedlings, and the nighttime delayed supplemental light of red and blue mixed light can promote the late growth of cucumber seedlings and improve the seedling strength index. Using LED red and blue light as the light source can effectively promote the morphogenesis of cowpea, bitter gourd, lettuce, and pepper seedlings, and with the enhancement of LED red and blue light, the morphological indicators of seedlings are gradually improved, the synthesis of chlorophyll is gradually increased, and the root vitality is gradually enhanced. Different LED light quality has significant and different effects on the growth of seedlings of different varieties such as cucumber, pepper, and tomato. Supplementing red light or red and blue light at the seedling stage can promote the growth of seedlings and is conducive to cultivating strong seedlings. Supplemental light can increase the content of flavonoids and total phenols in tomatoes and peppers, and enhance the activities of antioxidant enzyme systems cAt and soD, which is beneficial to improving the stress resistance and adaptability of plants to the environment. After being transplanted into the field, the greenhouse tobacco seedlings that have been supplemented with light are better than the conventional greenhouse seedlings in the growth stage, growth rate, and maturity stage, and the differences in the number of leaves and stem thickness have reached extremely significant levels; The ratio, single leaf weight, thickness, and specific leaf weight are far better than the control.

LED grow lights have a great impact on the growth of seedlings

As an important characteristic of the light environment, light quality directly or indirectly affects the synthesis and transport of plant hormones. Irradiation of red and blue light at the seedling stage can significantly promote the growth of vegetable seedlings and improve the seedling strength index. Different wavelengths of light can regulate the growth of plant internodes by affecting hormone levels in plants, and phytochromes can regulate the elongation and growth of hypocotyls by affecting the level of endogenous GA in cowpea seedlings. Far-red light promoted marked elongation of the hypocotyls of tomato and lettuce seedlings, and the seedlings were severely leggy. Blue-violet light can increase the activity of auxin oxidase, reduce the level of auxin in the plant, weakening the apical dominance, enhance the tillering ability, and then inhibit the elongation of plant internodes. Hypocotyl elongation of seedlings was related to light quality of different wavelengths. White light and blue light could inhibit stem elongation, while green light significantly promoted internode elongation. Exogenous application of IAA or GA could restore the hypocotyl elongation of lettuce seedlings suppressed by blue light to a certain extent, indicating that blue light may inhibit the elongation of hypocotyls by reducing the level of endogenous GAs in lettuce seedlings. However, the levels of various hormones in plants decreased under different compound light quality treatments, and the hypocotyls showed a lower growth rate. In the light treatment, when the proportion of blue light was appropriately increased (R/B=7:3), the height of the seedlings decreased significantly, and the seedling strength index increased significantly.

Last year, the global LED packaging output value reached 17.65 billion US dollars

Under the trend that the slowdown of the epidemic is driving the recovery of various global economic activities, the global LED output value in 2021 exceeded market expectations, reaching US$17.65 billion, an annual increase of 15.4%. Among them, the general lighting, horticultural lighting, automotive, and display application markets all showed relatively large growth; the backlight market benefited from the introduction of Mini LED technology and the drive of leading manufacturers, maintaining stability.

Last year, the global LED packaging output value reached 17.65 billion US dollars

Judging from the revenue ranking of LED manufacturers, benefiting from the rebound in market demand, most manufacturers showed significant growth in revenue, with the top three manufacturers accounting for 29.5% of the market. Nichia’s backlight LED business revenue declined despite the increase in OLED penetration. However, driven by the rapid growth of revenue in the flash, automotive LED, and general lighting markets, the overall revenue continued to grow steadily, ranking first in the world.

With stable product quality, excellent light efficiency, and cost-effectiveness, OSRAM is regarded as the first choice of suppliers for high-end cars and new energy vehicles around the world. In addition, benefiting from orders for plant lighting and infrared sensing, its revenue ranks second in the world.

Samsung LED also benefited from the improvement of automotive lighting, horticultural lighting, general lighting, and Mini LED backlight business, ranking third. Among them, Samsung Lighting LED products are positioned in the high-end market. In high-end markets such as Europe and the United States, the market share is gradually expanding due to the advantages of quality and patents. It is worth mentioning that Samsung LED’s horticultural lighting orders also showed rapid growth, driving its lighting LED business revenue to rank first in the world.

Seoul Semiconductor benefited from the large-size backlight, automotive LED, and lighting revenue growth. Lumileds also performed well in the fields of automotive LEDs and lighting LEDs and continued to launch a variety of LEDs for commercial lighting, plant lighting, and architectural lighting to seize market share. While Mulinsen, Nationstar Optoelectronics, and Hongli Zhihui have significantly increased their revenue in the display LED and lighting LED markets; Everlight and Lite-On continue to develop optocoupler, infrared sensing, and consumer electronic indicator products.

Looking at the performance in the first half of 2022, TrendForce said that despite the gradual recovery of demand in Europe and the United States, the Russian-Ukrainian war continued to cause raw materials to rise and inflation to deteriorate, which in turn resulted in weak demand in the consumer market. In addition, due to the impact of the epidemic in China, the industrial chain in some cities has experienced interruptions and chain-breaking crises. The scope of influence almost covers industries such as electronics and automobiles, and the supply and demand of the LED market have also suffered a certain degree of impact. Looking forward to the second half of the year, as the Chinese government is about to launch corresponding economic stimulus policies, it is worthy of attention. It is estimated that the global LED output value will continue to grow in 2022, but the growth rate will not be as fast as the performance in 2021.