Views: 0 Author: Grace Publish Time: 2022-03-08 Origin: https://www.suntechleds.com/
UV-C light is bactericidal, in other words, it inactivates the DNA of bacteria, viruses, and other pathogens, disrupting their ability to reproduce and cause disease. Specifically, UV-C light causes damage to the nucleic acid of microorganisms by forming covalent bonds between certain adjacent bases in the DNA so that they cannot survive. Ultraviolet light has shown great promise in providing effective surface disinfection and disinfection. So what should we know about the UV-C LED Strip before buying? What factors need to be considered? In this guide, we will list the TOP 10, let's take a look!
In the field of UVC LED lighting, we can boast our new flexible UVC LED strips in our products with a wavelength of 265~278nm, ideal for disinfection and sterilization of objects, environments, and surfaces. When we choose to buy UV LED strips, we know what kind of disinfection effect we want to achieve. We can be customized according to customer requirements. Because there are many types of UVC light strips, when the length of UV-led light strips and the distance between them and the surface are a little different, the effect of sterilization and disinfection will be different.
Suntechleds produces UVC LED series products as below for different options(Only some products are listed):
Suntechleds can customize the UVC board for you, you can click here to contact us.
2. LED chip
UVC strip is generally made with SMD3535 or SMD3939 chips, Suntechleds has SMD3535 and SMD3939 chips both are for option. Please see the following image is the size comparison of the two chips:
3. Luminous Flux
Advances in UV LED technology continue to increase the quantum efficiency of devices and improve their packaging designs. This has resulted in steady increases in radiant flux and reliability, while reducing costs, enabling UV LEDs to replace traditional UV light sources in many applications. Of particular note is the performance and longevity now achieved by UV-C LEDs, which enable new fields of application such as water purification in household products and air purification systems, as well as replacing deuterium lamps in spectroscopic instruments such as HPLC equipment. Therefore, accurate and traceable measurement of UV LEDs is becoming more and more necessary. In addition to the measurement of spectral irradiance, the measurement of spectral radiant flux is also very important.
In photometry, luminous flux or optical power is a measure of the perceived power of light. It is different from radiant flux, which is a measure of the total power of electromagnetic radiation (including ultraviolet, infrared, and visible light) because the luminous flux is adjusted to reflect the different sensitivity of the human eye to different wavelengths of light.
4. Stability and Lifetime
5Traditional light sources used in the UV spectrum can be replaced with LEDs, greatly reducing capital and operating costs. Newly launched high-performance deep ultraviolet (UVC) LEDs can provide better photostability than high-end deuterium lamps and provide more light output and lifetime. Unlike deuterium lamps, UVC LEDs are completely stable in an instant. This allows the end-user to take full advantage of the LED's lifetime, typically 3000 to 8000 hours, depending on application conditions.
Additionally, UVC LEDs emit negligible frontal heat, making them ideal for heat-sensitive samples. UVC LEDs use direct current (DC) power, and UV LED tape typically operates in the 7 to 13 V or 20v to 28v range. And the compact size of the LEDs allows the instrument to be 60% smaller than instruments that use mercury lamps. UVC LEDs are a non-toxic source of UV radiation, unlike mercury lamps that contain hazardous waste.
For example, The STSN-30UVC3939-24v in 25℃, I(F)=30mA, please see the wavelength graph on the left.
5. Beam Angle 60° VS. 120°
The beam angle is the angle at which the LED light travels on the surface or floor of an object when it is turned on. It can also be called beam spread, and choosing the right type of beam angle can give you sterilization effect and visibility. The UVC LED beam angle is 60 degrees with a transparent round lens, which means higher UVC density, stronger bactericidal effect.
UVC LED beam angle 60 degrees VS 120 degree let us take 20mw UVC LED chip as a comparison:
60 degree 20mw chip reaches 190.99μW/cm2 while 120 degrees 20mw chip only gets 21.22μW/cm2, what a huge gap!!!
Please check the image below for a clear comparison.
6. UV Flexible strip VS Rigid Bar
One of the most versatile form factors is the UV LED flexible light strip. LED strips to consist of a number of UV LEDs (365 or 395 nm) mounted on a flexible circuit board approximately half an inch wide. LED strips can be cut to length at 1-inch intervals, which means you can fit them in tight spaces like photo boxes and display cases. Best of all, since they operate at a very low 12V DC, there is virtually no electrical or fire risk. The back of the LED flexible strip includes a double-sided adhesive material that can be used to attach the LED strip to almost any surface. Since the LED strip is flexible, it can even be installed in curved or uneven places.
Rigid UV LEDs bars are similar to LED strips but are better suited for more permanent installations, or where a more robust installation is required. They are typically 1, 2, or 4 feet in length and can be chained to simplify installation. Rigid UV LED strips are ideal for mounting on trusses, shelves, or cabinets, and these lights can be mounted on straight, flat surfaces.
7. Right wavelength
Not all UV rays are the same, and wavelength is what differentiates whether UV rays can be used for disinfection purposes. UV-A, UV-B, and UV-C are ultraviolet rays divided into three categories according to their wavelength values. The most direct and conclusive research on sterilization to date shows that UV-C is the only UV wavelength class that can consistently be used for sterilization, as this wavelength range is the only one capable of directly damaging DNA and RNA. Several studies have been performed on specific viruses and microorganisms using UV-B and UV-A, but the mechanisms by which disinfection occurs are not well understood and conclusive.
It's even better if you buy a product that emits UV energy at the exact wavelength (measured in nanometers (abbreviated nm)). This is because thymine and uracil, the nucleic acids in DNA and RNA respectively, are only sensitive to a specific wavelength range with a peak at 265 nanometers. Therefore, products at or near 265 nm are generally best suited for sterilization. A common wavelength for UV-C LED products is 280 nanometers, but other things being equal, this wavelength is not as efficient as 270 nanometers because it is further from the peak absorption wavelength of 265 nanometers.
More read: How to use UV disinfection and precautions?
There are many applications where UV-C LEDs are being tested to see if they can be the solution to current disinfection challenges as well as our future challenges. Water purification, drinking water disinfection, and treatment are areas of interest for this technology, as the solution is chemical-free, has no risk of harmful by-products, is an effective method of pathogen inactivation, and has very low maintenance costs.
In addition to water, UV-C LEDs also provide disinfection for air and surfaces. UV-C LED air purifiers for HAVC (Heating, Ventilation and Air Conditioning) are increasingly used in the commercial sector. In applications ranging from residential to commercial, healthcare, transportation, life sciences, defense, and emergency response, UV-C LEDs are finding new uses:
UV-C LED system benefits: Top 3 important attributes
Valued by segment
Food and beverage service, Water dispensers, and fountains
Ultra-compact footprint, Low power draw, No heating of water
HAI control, Dialysis, Dental
Mercury-free, Chemical-free, Durable (e.g. vibration resistance)
RV and boating, Automotive, Aviation, Space
Chemical-free, Durable, Lightweight
POE, Appliances, Faucets
Ultra-compact footprint, Plug and play (e.g. easy to retrofit), Low power draw
Bio-pharma, Ultrapure water
Point-of-use distribution, Mercury-free, Chemical-free
Personal hydration, Remote treatment
Ultra-compact footprint, Lightweight, Durable (e.g. vibration resistance)
UV-C wavelengths are more powerful than other forms of UV light. In fact, UV-C does not exist in natural sunlight because it is blocked by the Earth's atmosphere. So it's very important to remember that UV-C is an unnatural type of radiation that is more powerful than the dangerous forms of UV radiation found in natural sunlight (i.e. UV-A and UV-B).
High output UV led strip can cause sunburn on human skin and can also lead to skin cancer. Do not expose humans or animals to UV-C radiation. Since UV-C rays are invisible, there is an additional risk of accidental exposure. Therefore, when considering UV-C as a germicidal method, great care should be taken to install and configure products in a way that prevents human and animal exposure and use protective gear where necessary.
Note that the UV-C LED Strip is not a magic device, it will not immediately absolutely sterilize any room or area where you place them. In order for it to work properly, UV-C radiation must reach specific surfaces with sufficient intensity. Some of the biggest pitfalls of UV-C sterilization include the inability to reach areas in "UV shadows." UV shadows are areas where another object blocks UV rays from reaching.
As a simple example, let's say you're trying to sanitize your smartphone using UV-C lights. There's a good chance that you won't be able to expose all sides of the smartphone at the same time. You may need to turn the phone over a few times to ensure that all sides are getting enough UV-C exposure for adequate disinfection. But flexible UV-C LED strips could offer greater potential for innovation and versatility.