Types and Phenomena of Poor Ultraviolet Curing

For fluorescent stimulation in NDT, UV-LED sources are becoming more and more prevalent. The possibilities provided by this new technology are unparalleled. Still, technical problems must be resolved to increase the likelihood of detection and workplace safety. Additionally, it can simplify the application of non-destructive fluorescence crack- and backflow and opens genuinely new possibilities to accommodate all the various requirements in all the various industries and locations fluorescence testing is present. The significant technological differences between traditional UV based simply on mercury vapor, Xenon, or metal halide bulbs and LED technology, particularly UV-A-LED technology, necessitate considering several influential aspects. Ultraviolet LED technology The UV-LED technology is a relatively recent component of NDT practice. Users value the enjoyable work environment and crystal-clear viewing circumstances provided by high-quality LED-based UV sources. A semiconductor, an LED, will likely transform lighting and radiation emitting sources from ultraviolet to infrared radiation, much way semiconductor UV led diode revolutionized electronics by replacing uv led diode tubes. For the first time, we can now use ideal UV-A sources in NDT, which only emit invisible UV-A radiation without any unpleasant, harmful, or unnecessary radiation. Output, LED technology enables the variable design of the source related to the size, intensity, and electric security class needed to improve POD (probability of detection), eliminate unquestionably UV-A-induced fade of indicators, and realize a greater degree of workplace safety. Many users and administrators are hesitant to use this fantastic technology because of the lack of transparency and the absence of standardization, parameterization, and description. It is necessary only to employ technical compliant sources to ensure the high degree of testing we were performing in the delicate field of MT- and PT-Testing. The majority of producers merely attempt to replace traditional light bulbs with LEDs. They are unconcerned with the significant technical difficulties and distinctions. They do not use the opportunities that this advanced technology necessitates and makes possible for our particular and extremely delicate testing technique. Most of the time, information and product descriptions do not specify the pertinent parameters. Industrial Curing and Coating Benefits of Next-Gen UV LED Technology The ultraviolet (UV) spectrum has numerous positive impacts in several technical industrial and manufacturing processing domains, despite the possible risks of UV irradiation, which are visible in daily life by its ability to cause sunburn. Similar to how today's illumination, signage, and display businesses have been impacted by regular visible wavelength LEDs, advanced implementation of ultraviolet LEDs is now providing a wide range of benefits to a diverse variety of applications, particularly in technical and industrial areas. There is a huge demand for novel disinfectant techniques for the surface disintegration of the virus as Coronavirus is rising (COVID-19). This is one of the main elements influencing UV LED Solution demand worldwide. Additionally, the market is expanding due to technological developments in producing solid-state UV sensors and the rising demand for environmentally responsible ways to make optoelectronics. In addition, the use of UV LEDs is positively impacted by the growing use of Led - based for UV curing industrial and commercial products, such as inks, because of their improved efficiency and cheap ownership costs. Additionally, the global adoption of UV LEDs is boosted by the new trend of downsizing consumer electronics. In addition, it is projected that in the next years, the market will be driven by the growing applications of UV LEDs, including deoxyribonucleic acid (DNA) testing, and killing bacteria for air, surface, and water cleaning. UV led moduletechnology has been constantly upgraded with the rapid development of science and technology. The use of UV LED Solution in medicine has been more and more popular because it is environmentally friendly and cost-effective. In addition to its application in treating diseases, uv led modulehas other purposes such as disinfection, sterilization, and printing& curing. Growth Engines Significant thermal issues would hamper the growth of the UV LEDmarket in UV LEDs, where only one-half of the total power is converted to Ultraviolet rays, and the other half is converted to heat. Additionally, the short lifespan of these LEDs lowers the phone's proficiency and efficiency, obstructing the outlook for the goods. The following are the major growth engines; ·UV curing devices are becoming more widely used globally. ·Growing horticultural and indoor farming practices in impoverished countries ·increased demand for UV LEDs in smart home products ·increased use of LEDs for detecting fake cash ·the rapid adoption of LEDs in the medical and healthcare fields ·Technical problems with UV LEDs could impede the development of the sector. However, ongoing advancements in UV LEDtechnology and coordinated efforts from numerous businesses will promote product use in smart home devices in developing countries, generating sizable growth potential for UV LEDproducers. The UV LED market is divided into three types. UV-A, UV-C, and UVB_ By 2030, it is expected that the UV-C LED market will be worth more than USD 700 million. Due to the UV-C LED's many benefits, such as its flexible design, durability, environmental friendliness, simple operations, and so forth, the market for these lights is expected to increase significantly throughout the forecasted period. Effective expansion tactics to support the UV LED sector Tianhui electricis a significant UV led manufacturersin UV LEDs. Businesses usually concentrate on launching new products and forming strategic alliances. UV-LEDs are superior to UV lamps because they are mercury-free, have superior energy efficiency, a longer lifespan, more consistent light output, and have easy temperature and heat management. UV-LEDs are anticipated to be employed more frequently due to all these factors. https://www.tianhui-led.com/ Zhuhai Tianhui Electronic Co., Ltd. is a high-quality UV Led manufacturers passionate about helping customers with their UV LEDneeds. The company has been engaged in UV LEDpackages with full production series, stable quality, reliability, and competitive prices. The products include UVA, UVB, and UVC from short to long wavelengths and complete UV LEDspecifications from small to high power. Their team has a professional R&D and sales team to provide customers with the necessary UV Led solution.They have also received wide acclaim from their customers. Tianhui Electronics offers a full production series of products that include UVA, UVB, and UVC from short to long wavelengths and complete specifications for all types of UV LEDpower sources.

High-temperature surfaces, like the Sun, emit UVC ultraviolet raysin a continuous spectrum, and atomic stimulation in a gaseous discharge tube emits UVC ultraviolet rays in a discrete spectrum of wavelengths. The oxygen in the Earth's atmosphere absorbs most UV radiation from sunlight, creating the ozone layer in the lower stratosphere. Nearly all UVA radiation that reaches the Earth's surface is ultraviolet. What Is Of UVC LED Ultraviolet Rays The UV light spectrum's UVC LEDwavelength has the maximum energy. The ozone in the atmosphere blocks UVC LEDlight from the Sun from reaching the surface of the Earth. Therefore, a lamp or laser is the only artificial source of UVC LEDradiation that can expose people to it. A type of electromagnetic radiation, UVC ultraviolet raysor UV light, has a frequency that is longer than that of x-rays but less than visible light. Sun emits UVC ultraviolet rays;however, most mid and upper-range wavelengths are obscured by ozone gas in the atmosphere. In manufactured UV light-using devices like tanning beds or black lights, the lower range that approaches the violet end spectrum of visible light has greater noticeable effects. What Are The Dangers Of UVC LED Radiation Exposure? UVC LEDradiation can result in serious skin burns and eye damage (photokeratitis). Never stare directly at a UVC LEDlight source, not even momentarily. Prevent direct skin contact with UVC LEDradiation. UVC LEDexposure commonly results in skin burns and eye problems, but there is no known long-term harm. The danger of developing skin cancer, cataracts, or irreversible eyesight loss is also believed to be very minimal due to the limited depth of penetration of UVC LEDradiation. The form of eye injury linked to UVC LEDexposure results in excruciating pain and the sensation that sand is in the eyes. Sometimes people lose the ability to see for a day or two. The Uses Of Ultraviolet With a high-power lamp placed close to the patient and the irradiation beam perpendicular to the skin's surface, the amount of UV radiation that reaches the skin is at its highest intensity. The UV light with the peak value, longest duration, and lowest frequency penetrates the deepest. While UVB and UVC LEDenter less deeply and are virtually totally absorbed inside the superficial layers of the epidermis, UVA penetrates the furthest and can reach through several millimeters of skin. If the epidermis is thicker or darker, UV rays do not penetrate as deeply. One of the most frequent and noticeable results of UV radiation exposure is erythema or skin redness that occurs because of dilatation of the surface blood vessels brought on by the release of histamines. Erythema is primarily brought on by UVB or UVA exposure following medication sensitization. UVA is 100–1,000 times less effective without chemical sensitization than UVB at causing erythema. A worker is less likely to be exposed to or burned by UVA after sensitization than by UVB alone. However, it is recognized that this impact is mediated by pge release of the epidermal and may be connected to the Genetic material effects of UVC ultraviolet raysirradiation. The exact mechanisms of UV-induced erythema are uncertain. The main considerations limiting the amount and length of UV radiation that can be employed are the severity of redness, which can result in blisters, tissue burning, or pain, and the danger of cell damage. Patients respond to UV in varying degrees. Thus before beginning, UV treatment for a patient, a minimum erythemal dose (MED) is established for them. Due to skin alterations from tan and hyperplasia, increasing doses of Uv rays are typically required during the duration of UV treatment. In a laboratory context, UVC LEDcan be bactericidal in the right doses. In one tiny study, UVC LEDradiation was just as successful as conventional hospital cleaners at eradicating infections from hospital surfaces. UVC LEDradiation is used to eliminate bacteria in food. Additionally, one clinical investigation discovered that UVC LEDirradiation might aid in lowering the bacterial burden in open wounds and enhancing wound healing. Finding out a patient's susceptibility to UV radiation is the first step in utilizing UVC ultraviolet raysfor therapeutic purposes. This varies greatly between people and can be influenced by factors like skin pigmentation, age, previous UV radiation exposure, and the use of drugs that cause sensitization. For instance, the lowest erythemal dose can vary four to six times, even in Caucasians. Dosimetry techniques discussed in the following section are used to determine UV radiation sensitivity. The same lamp must be used to determine an individual's sensitivity to UV radiation and for all biological treatments because the reaction to UV radiation can vary dramatically with even slightly varied radiation frequencies. The skin is 100 times more sensitive to UV with a wavelength of 300 nm than UV with a frequency of 320 nm. The patient's response to the different lights must be assessed before therapeutic use if the lamp needs to be replaced. Reevaluation is also necessary if there is a lengthy period between treatments because hyperplasia and skin tanning both worsen with time and lamp output intensity does as well. Once the person's reactivity to a particular UV lamp has been established, the enhanced recovery can be chosen to obtain the desired results based on the current response. https://www.tianhui-led.com/products.html Where To Buy UVC LED From? Zhuhai Tianhui Electronic Co., Ltd., one of the top UVLed manufacturers, specializes in UVC disinfection,UVC LED Sterilization, UV LED printing and curing, UV LED, UV LED modules, and other goods. It has a skilled Research and innovation and sales team to offer consumers UV Led solution, and its goods have also won the praise of many customers. With a complete production run, consistent quality, dependability, and affordable costs, Tianhui Electronics has been working in the UV LED package market. From short to long wavelengths, the products cover UVA, UVB, and UVC LED, with full UV LED specs ranging from low to high power. We are acquainted with various UV LED uses, including UV curing, UV medicinal, and UVC LED Sterilization. We are the top UV Led manufacturerswho specializes in the UVC LED, UV LED’s with constant research.

UVC radiation is a well-known water,air,and transparent or translucent surface disinfection. Many years ago, UVC radiation was used successfully to stop the spread of microorganisms like tuberculosis.Due to this property, UVC lamps are frequently referred to as "germicidal" lamps. The SARS-Coronavirus, which is a distinct virus from the present SARS-CoV-2 virus, has been demonstrated to have its outer protein coating destroyed by UVC radiation. In the end, the virus is rendered inactive as a result of the annihilation.UVC- Light disinfection is a handy tool to disinfect surfaces, especially under the current circumstances. The UV-C Light Disinfection Due to its high effectiveness and low cost, ultraviolet germicidal irradiation (UVGI) is frequently used to disinfect the air, water, and other types of surfaces. It is generally known that ultraviolet radiation can make germs and viruses inactive. Since bioaerosols strongly absorb their wavelengths, shortwave ultraviolet C (UV-C) light with a wavelength of 100–280 nm is frequently employed in UVGI. Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) damage caused by radiation can render bacteria or viruses inactive. Application For Uv-C Light Disinfection Due to their inherent advantages and limitless potential, UV light applications are fast replacing other methods of surface, air, and water sterilizing in many sectors. Medical disinfection Experts in the lighting business believe that upper-room germicidal UV is the most efficient technique to lessen the spread of viruses and bacteria. UV-C radiation is continuously emitted above people's heads by upper-air units to clean the air in a space. Upper-room UV systems are safe for use in populated spaces because the UV-C rays really aren't directed closely at humans. It should not be a surprise that surfaces in health centers and other settings can benefit from being disinfected using UVC disinfection. UVC light can quickly kill microorganisms on a surface, including live viruses. In this situation, UVC can be far more effective and efficient than other disinfecting and cleaning techniques in healthcare institutions. Skin Treatment Electromagnetic radiation just outside visible violet light is known as ultraviolet (UV) light. Radiation with a wavelength between 740 and 380 nm makes up all visible light to the human eye. The electromagnetic spectrum's range from 400 to 100 nm includes UV light, which is invisible to us. UV LED solutions can be divided into four categories based on their wavelength. There are five types of UV radiation: ·UV-A, between 320and 400 nm, causes skin tanning ·UV-B, between 280 and 320nm, causes skin burns and the synthesis of vitamin D ·UV-C, between 200 and 280 nm, is used to disinfect ·UV-V, somewhere around 100 and 200 nm, is vehemently absorbed by water and air and can only be transferred in a vacuum. Plant Growth Fruit and vegetable shelf life has been successfully increased by controlling postharvest infections with the fatal action of UVC disinfection. The impact of UV-C irradiation in preventing postharvest disease deterioration in harvested horticulture goods by performing an immediate germicidal effect or inducing vital defense responses has been thoroughly investigated. On carrots, lettuce, tomato, and strawberry, for example, it can create implementation and application to the plant-pathogenic fungal Botrytis cinerea. In the case of strawberries, increased phenylalanine ammonia-lyase (PAL) and polyphenol oxidase activity and expression of pathogenesis-related protein genes were associated with increased resistance. Additionally, UV-C radiation can trigger defensive mechanisms, boosting the levels of chitinase and superoxide dismutase (SOD) or PAL in various fruit, including mango, peach, and strawberry. Pet Lamp The germicidal UVC lamps have emerged as the ideal ally in this endeavor. Numerous studies have demonstrated their efficiency against various microorganisms since they can eradicate up to 99.9% of the bacteria and viruses in the atmosphere and on surfaces. Additionally, these tests have demonstrated that this UVC light kills bacteria created by pets, which is quite handy at home. And it is just here that UVC lights are beginning to carve out a position for themselves in the current pandemic. The increased use of indoor lighting has raised various concerns regarding the risk we may face from these lights. To dispel those uncertainties, we must first understand that UVC lamps can harm the eye and skin tissue. They are completely safe when used in compliance with a few basic safety precautions. - These actions are listed in this article for your reference. People should not be present throughout the sterilization process due to the care that must be followed when using this bulb. Additionally, contact with UVC disinfectionradiation may cause undesirable tissue damage even though there isn't any conclusive research on the harm caused by these rays. Therefore, excluding dogs and plants from space is wise. Cannabis Is Cultivated It is suitable for permanently inactivating germs like Botrytis cinerea because ultraviolet germicidal radiation, or light energy at the UVC disinfectionwavelength (200-280nm), dissociates molecular bonds, which cleans and disintegrates organic materials. Scientists have yet to discover a microbe completely resistant to the harmful effects of UVC disinfection, including resistant bacteria and other microorganisms resistant to antibiotics. UV-C air-stream disinfecting systems and UVC disinfectionsurface disinfecting systems are the two methods for employing UV-C to inhibit the growth of mold and germs in indoor cannabis gardens. Best Uvc Led Sterilization And Where To Buy It We have you covered if you are looking for a perfect UV-C light disinfection. 275nm UVC LED Sterilizationis a deep UV-C emitting diode with a wavelength of 305-315. It has an SMD design with low thermal resistance. It has a wide range of resistance that allows easy usage. https://www.tianhui-led.com/uv-led-module.html Zhuhai Tianhui Electronic Co., Ltd., one of the top UV Led manufacturers, specializes in UV- C light disinfection, UV led solutions, andUVC disinfection. It has a skilled R&D and sales team to offer consumers UV-C Light disinfection Solutions, and its goods have also won the praise of many customers. With a complete production run, consistent quality, dependability, and affordable costs, Tianhui Electronics has been working in the UV Led solutionmarket. From short to long wavelengths, the products include UVA, UVB, and UVC, with full UV LED Solution specs ranging from low to high power.

The output power control of the UVLED curing machine is an important parameter of the device. It directly determines the effect of solidification. On different occasions, the intensity of light required is different. Therefore Different power, we use the products of Zhuhai Tianhua Electronic Co., as an example to illustrate how to achieve different power output. First of all, there is an interactive interface to control the software. You can set the external input conditions from 10%to 100%. When an external input is input a certain value, the system will generate a DA signal. Accepting the constant current source of the light source, the power supply will provide the corresponding power to the light source according to the requirements, control the light source, and the operation is simple and convenient. Author: Tianhui-Air Disinfection Author: Tianhui-UV Led manufacturers Author: Tianhui-UV water disinfection Author: Tianhui-UV LED Solution Author: Tianhui-UV Led diode Author: Tianhui-UV Led diodes manufacturers Author: Tianhui-UV Led module Author: Tianhui-UV LED Printing System Author: Tianhui-UV LED mosquito trap

Where is 0603LED lamp beads? Product products need. Product Description: 1.0603 Patch LED Lighting Package Specification: Laughing Color: Blue (A variety of colors can be available) 2.0603 Patch LED Lighting Bead Structure: Facial contact type 3.0603 Patch LED Lighting Package: colorless transparent resin packaging; 4.06033; 4.0603 Patch LED lamp beads: The products are widely used in electronic dictionaries, PDA, MP3/MP4, headphones, digital cameras, VCDs, DVDs, automobile audio, communications, computers, power amplifiers, instruments, gifts, electronic toys and mobile There are many fields such as calls. 5.0603 Patch LED Lighting Ball Product Characteristics: strong light, low power consumption, good reliability, long life, energy saving and environmental protection. Welcome new and old customers to learn about the sales of 0603LED lamp beads, 0603LED lamp bead installation, 0603LED lamp bead dealer, 0603LED lamp beads, we have a lot of product/service information waiting for you to inquire Author: Tianhui-Air Disinfection Author: Tianhui-UV Led manufacturers Author: Tianhui-UV water disinfection Author: Tianhui-UV LED Solution Author: Tianhui-UV Led diode Author: Tianhui-UV Led diodes manufacturers Author: Tianhui-UV Led module Author: Tianhui-UV LED Printing System Author: Tianhui-UV LED mosquito trap

0402 What are the colorful lamp beads for LED, the brightness parameters are how many 0402 lamps size: 1.0mm*0.5mm*0.4mm, so 0402 lamp beads are also called 1005.0402 lamps. For automotive electronics, electronic consumption, LED backlight sources, electronic electrical appliances, computers, mobile digital products, etc. 0402 Patch LED0402 Patch LED LED is highly reliable, with high brightness consistency, luminous angle, and small outer volume and size. The harsh belief at the end of the lamp beads has been pushed to the market in batches. Monochrome 0402 lamp beads: 0402 white light, 0402 red light, 0402 orange light, 0402 yellow light, 0402 emerald green, 0402 yellow -green, 0402 blue light, 0402 double -color lamp beads, 0402 three -color, full -color lamp beads, etc. 0402 Patch LED0402 Patch LED model is divorced: 0402 red light: EH-C281krkt multi-color LED lamp beads 0402 orange light: EH-C281kfkt0402 Emerald green: EH-C281TGKT-5A0402 blue light: EH-C281TBKT-5A0402 white light: EH- EH- C281ds5 Author: Tianhui-Air Disinfection Author: Tianhui-UV Led manufacturers Author: Tianhui-UV water disinfection Author: Tianhui-UV LED Solution Author: Tianhui-UV Led diode Author: Tianhui-UV Led diodes manufacturers Author: Tianhui-UV Led module Author: Tianhui-UV LED Printing System Author: Tianhui-UV LED mosquito trap

Because CMOS/CCD optical curing requirements are low -temperature curing, it is not advisable to choose a large heat -curing system such as mercury lighting settings on the use of solidification systems, then CMOS/CCD low temperature curing must be selected as the UVLED light of cold light sources. CICF. Of course, the advantages of UVLED optical curing systems are not limited to cold light sources, but also have the advantages of energy saving, environmental protection, high efficiency, long life, and low cost. Camera module composition: The camera module consists of lens, mirror, chip, circuit board, connector, in which UV glue at the seam of the lens Lens and the mirror seat, as shown in the four points below, point UV glue: for the target This highly difficult solidification, Tianhui specifically designed a latest UVLED curing device, which can not only solve the solidification problem, but also the effect is quite significant. The specific device diagram is shown in the figure below: Author: Tianhui-Air Disinfection Author: Tianhui-UV Led manufacturers Author: Tianhui-UV water disinfection Author: Tianhui-UV LED Solution Author: Tianhui-UV Led diode Author: Tianhui-UV Led diodes manufacturers Author: Tianhui-UV Led module Author: Tianhui-UV LED Printing System Author: Tianhui-UV LED mosquito trap

When designing UVLED drivers, the appropriate driver method should be selected according to the requirements of power size, application occasion, driving performance, and economy. If the driving source performance does not match UVLED expected. This article summarizes several commonly used driving methods. UVLED constant voltage driver UVLED constant voltage source is defined as the output voltage is constant when the allowable load is constant, and it will not change with the change of the load (output current). In fact, the voltage output of constant voltage sources still has a certain ripple. It can be seen from the UVLED Voldemort characteristics that UVLED work in a non -linear area. The tiny voltage changes will cause a large current of UVLED. , High accuracy to the drive source. Figure 1 shows the local I-V curve chart of a UVLED. Figure 1 UVLED driver UVLED constant current source is characterized by the constant output current, which does not change due to changes in the load (output voltage). The constant current driver is generally divided into linear constant current and switching constant current. The switching constant current is widely used in high -power UVLED surface sources and wire light sources due to high efficiency and good stability. Figure 2 shows the basic frame diagram of a constant current driving solution. Figure 2 When designing the UVLED driver scheme, regardless of the use of constant voltage or constant current driver, in order to improve the reliability of the system, various protection measures are needed, such as overload protection, over temperature protection, etc. Author: Tianhui-Air Disinfection Author: Tianhui-UV Led manufacturers Author: Tianhui-UV water disinfection Author: Tianhui-UV LED Solution Author: Tianhui-UV Led diode Author: Tianhui-UV Led diodes manufacturers Author: Tianhui-UV Led module Author: Tianhui-UV LED Printing System Author: Tianhui-UV LED mosquito trap

At present, most companies have realized the importance of energy conservation and environmental protection, especially companies that do UV ultraviolet curing technology. Many customers have a lot of doubts when consulting the UV curing scheme. Why use the LEDUV curing machine, what is the difference between LEDUV curing machine and lamp -type UV curing machine? In response to this issue, Tianhui specially made a comparison chart, hoping to help these friends find the answer they want! Tianhui is committed to providing high -efficiency and environmental protection products and solutions for the entire industry, bringing more efficient and lower energy -consuming LED cold -light UV curing machines to customers. The cooling system, driving system and optical system developed by Tianhui have won a lot of praise from the majority of clients. Author: Tianhui-Air Disinfection Author: Tianhui-UV Led manufacturers Author: Tianhui-UV water disinfection Author: Tianhui-UV LED Solution Author: Tianhui-UV Led diode Author: Tianhui-UV Led diodes manufacturers Author: Tianhui-UV Led module Author: Tianhui-UV LED Printing System Author: Tianhui-UV LED mosquito trap

Now when we do glue testing for customers, we will encounter the use of UVLED devices to irradiate and solidively, and it will be a bit sticky to touch the surface of the glue with our hands. In the inside of cutting and curing glue, we can see that the glue is completely solidified after the glue is shot with the UVLED light. Why do you have such an imagination? This has extended an important problem in the UVLED curing industry. UV glue is the problem of oxygen resistance when curing up with UVLED device. Oxygen closure is a common problem in the reaction of optical curing. In the UVLED optical reaction, the free radicals generated by the cracked light cause of the light cause will be captured by oxygen to form peroxic free radicals. The problem. The method of overcoming oxygen blocking can be divided into two types: chemical and physical methods. The method of inert gas used in physical methods to isolate oxygen is a very effective method. The commonly used inert gases are usually nitrogen, or sorbe. The cost of nitrogen and gaseous gas is relatively high, and the other inert gas that can be used is carbon dioxide. The use of carbon dioxide has some advantages that other gases do not have: First, carbon dioxide is easy to obtain, and the cost is low. Secondly, because carbon dioxide is heavier than air, it is easy to maintain in the container, so that there will be less loss. Author: Tianhui-Air Disinfection Author: Tianhui-UV Led manufacturers Author: Tianhui-UV water disinfection Author: Tianhui-UV LED Solution Author: Tianhui-UV Led diode Author: Tianhui-UV Led diodes manufacturers Author: Tianhui-UV Led module Author: Tianhui-UV LED Printing System Author: Tianhui-UV LED mosquito trap