Kill COVID-19 need UVC DOES 22mj/cm2, our UV sterilized LED can kill at most 42mj/m.
COVID-19 virus is Organic matter, our UV lamp can decompose organic matter into CO2 & H2O. From this logic, it can. But
Labs in China don’t accept the virus test, so we are not able to confirm this.
Before answering this, let’s first see the operation principle of the air conditioner:
In the impression of many people, the reason why the family split air conditioner can refrigerate is that the outdoor unit of the air conditioner absorbs the air outside the room and then cools it into air conditioner and sends it back to the room.
But this is not the case. Although the indoor unit and the outdoor unit of the air conditioner have a pipe, what is exchanged in the pipe is not air, but only heat. The reason why the indoor unit can reduce the temperature in the room, the reason is that it absorbs the indoor air through the air vent, and then this part of air is cooled by the evaporator and then sent back to the room through the air vent.
In the continuous internal circulation, the room is filled with air conditioning.
But in this way, germs and bacteria hiding in every corner of the room will gather inside the air conditioner along with the wind, and the temperature and humidity inside the air conditioner are very suitable for the growth and reproduction of microorganisms, therefore, the necessary air conditioner in summer can easily become a concentration place for bacteria.
Therefore, we set up a line of defense in the internal circulation mechanism of air conditioning “air inlet-cold air-air supply” by using ultraviolet air:
When the microbial Legion in the air enters into the air conditioner, it will first pass through the light contact membrane filter screen of the ultraviolet air. At this time, the UVA of the ultraviolet air will start to exert its power to stimulate the photocatalyst, break down these microorganisms into carbon dioxide and water.
After “washing” through the light contact membrane filter screen, microorganisms will also receive UVC irradiation to destroy their RNA or DNA. As a result, when the air is sent back to the room, the germs coming in with them have been cut off.
This is the principle of double elimination of UV ultraviolet.
We have Gmicro Testing report.
In this test, we carried the entire air conditioner into the laboratory, simulated a confined space the same as the indoor environment, put a certain amount of germs, and then waited 30 minutes and two hours after the air conditioner was turned on before testing. The concentration of bacteria.
The experimental results show that the bacteria-killing rate in 30 minutes is 80%, and the bacteria-killing rate in 2 hours is 99% (it is estimated that it can reach 99% in 1 hour, but we did not test it for 1 hour).
This means that for users, as long as they are turned on for 30 to 60 minutes, the concentration of bacteria and viruses in the environment can basically be reduced to a very low level.
When our Deep UV air sterilizing LED is running, smoke a cigarette (or light a cigarette) indoors. After a while, the smell of smoke will dissipate, and you can directly feel the UV purification effect from the olfactory.
In short, photocatalyst is a process in which a medium decomposes bacteria and bacteria into carbon dioxide and water under the action of light, and this medium is called titanium dioxide.
Titanium dioxide is a strange name. In fact, it is an “old friend” in our life. Whether it is sunscreen used in summer, paint on the wall at home or white in candy, titanium dioxide is an important component.
So, why do we need to add UVA + photocatalyst when UVC antivirus ?
The reason is that the light intensity of UVA is ten times that of UVC. Although it does not have much sterilization effect, it is the best trigger medium for photocatalyst.
Under the triggering of UVA, the efficiency of photocatalyst is 1550 times that under the triggering of UVC, that is to say, as the first sterilization and disinfection process, when the photocatalyst is used together with UVA, it can efficiently decompose microorganisms into carbon dioxide and water, and then give them to UVC for killing, which can maximize the killing effect of ultraviolet air.
UVA with a wavelength of 320~400mm has no effect of sterilization and disinfection. Its main application scenarios are generally curing, printing, banknote checking, manicure, etc.
(However, if UVA is the best catalyst for the excitation of photocatalyst, its excitation efficiency is about 5 times that of UVC with the same radiation flux, let alone at the same cost, the radiation flux of UVA is almost 1000 times that of UVA)
UVB with a wavelength of 280-320nm has no sterilization effect, and its main application scenarios are generally health care and skin disease treatment. Only UVC with a wavelength of 100-280nm has the efficacy of sterilization.
(But in fact, the description of “sterilization and disinfection” is not very accurate, because its working principle is actually to destroy the DNA or RNA of cells, so that it no longer has the function of reproduction, however, the life span of a single bacterium/virus is often very short, and once it is “dead”, it often means extinction).
The reason why UVC + UVA + photocatalyst is used to kill UVC home air is that ultraviolet ray is not a sniper rifle that can hit the head with one shot. It is more like a submachine gun that needs to be shot many times to kill the enemy, however, bacteria and viruses are not weak brigades that can kill people in one move. They have blood levels.
Therefore, if bacteria and viruses are still in the air, it takes time to shoot them with ultraviolet rays, not to mention that they flow at a high speed, then shooting them takes more time.
Therefore, we add UVA + photocatalyst to make them break down into carbon dioxide and water through the action of photocatalyst before being strafed, so as to ensure that the ultraviolet air can be killed efficiently.
To put it simply, deep UV LED turns the split air conditioner of the home into an “advanced air purifier”. Compared with the traditional air purifier, its “advanced” is reflected in: In terms of price, traditional air Air purifiers cost thousands at every turn, and the price of UV air purifiers is less than half of that of traditional air purifiers.
In terms of area, deep UV LED is installed inside the air conditioner. Even if the package is unpacked, the area is only the size of A4 paper, which does not occupy any family space at all. However, traditional air purifiers are often too large for small families. For users, it’s not very good.
Functionally, traditional air purifiers cannot eliminate bacteria and germs. It just adsorbs these microbial corps on the filter to temporarily “turn off” these harmful agents. The air conditioner companion (UV LED) uses UVC + photocatalyst + UVA. , The army of microorganisms inside the air conditioner will be wiped out, “even the dead bacteria” will not stay on the filter.
Therefore, compared with air purifiers, our deep UV LEDs have lower cost and better effect.
First, let’s take a look at the internal structure of UV air sterilizing LED: it is composed of 2 UVC lamp beads and 8 UVA lamp beads.
Although UVC is harmful to the human body by direct irradiation, its energy degeneration is extremely strong. At a distance of one meter from the UVC lamp beads, its energy degeneration can reach 90%, that is to say, 100 milliwatts of energy UVC light, irradiating At a distance of one meter away, its energy is only a pitiful 10 milliwatts.
Moreover, the penetration of UVC is extremely poor. Except for a small number of materials such as quartz glass that can penetrate, if it is irradiated on a wall or plastic material, it will be directly absorbed, and only a few materials such as aluminum can refract the light. .
The UV light bar is installed on the front panel of the air conditioner. The light emitted during operation will only illuminate in two directions. If it illuminates the filter membrane downward, there will be no “leakage”. , If a small amount of upward light spills onto the wall, the light will be directly absorbed.
We also assume that it can really refract, but the distance we are and the distance of the air conditioner are at least 2 meters away, and the light is strong. That is to say, if you stand one meter away, it The irradiated energy is 10 milliwatts, but if the space we are in is 25 square meters, then the energy is divided into every centimeter of space, and the energy is almost zero.
And only when the light intensity of UVC reaches 5μW/cm2, it will be harmful to human body, so there is no need to worry about UVC light leakage.
As for UVA, our ultraviolet home uses 405nm UVA. According to the IEC62471 photobiological safety test standard, 405nm UVA belongs to the “exempt level” and is light that does not cause harm to the human body. In summary, the operation of UV homes is very safe.
UVC ray is harmful to health or not, it depends on on:1. distance 2. DOSE.
Our product is:8pcs UVA+2pcs UVC.
If UVC directs irradiate on body, it will be harm. But UVC has its character, distance is longer,UVC ray will weaker.
If>26cm between our led with people, our UV light is safe. That is reason why we design to install the led on the A/C front baffle. A/C is higher than house members active, and children cannot touch.
The characteristics of the LED chip: ultraviolet rays will continue to degrade the chip material of the organic package, and the LED chip is very sensitive to oxygen and moisture.
Therefore, the UV light will use inorganic packaging materials that will not be degraded by UV light to assemble the chip, and before the light source leaves the factory, the water vapor and oxygen in the light source are pumped away by a vacuum process, so that UVC LEDs can be guaranteed The life span can reach 10,000 hours.
If organic encapsulated material chips are used and no vacuum process is used to process the light source, the actual life span may only be 1,000 hours, or even 300-500 hours.
Therefore, those on the market that claim that their UVC LEDs have a lifetime of 50,000 hours are all using information asymmetry to create boo heads to defraud users. Be sure to keep your eyes open when choosing a product.
As a matter of fact, the photocatalyst filter membrane of the UV air purification LED can be used for life, and there is no need to replace it after it is attached. The reasons are as follows:
First, the titanium dioxide in the photocatalyst filter membrane plays a catalytic role in the process of photocatalyst decomposing microorganisms into carbon dioxide and water, that is, it will drive the surrounding chemical factors to participate in the chemical reaction To go, but it itself will not be consumed, so no matter how many times the photocatalyst acts, the amount of titanium dioxide will not change.
Second, the titanium dioxide in the ultraviolet air purification is nanoscale. After entering the photocatalyst filter membrane, it will be firmly embedded in the molecular gap of the carrier and cannot be washed away at all.
Therefore, as long as the photocatalyst filter membrane is not physically damaged (such as accidentally torn), the life is permanent. However, since the material of the photocatalyst filter membrane is non-woven fabric (about as thin as paper), When cleaning the dust on the air conditioner filter regularly, do not use water to clean it, otherwise it will easily cause damage to the filter membrane.
Regarding this issue, we first look at two data: According to the IEC62471 standard, UVC radiation illuminance must be below 0.2μW/cm2 to ensure long-term exposure safety, and short-term exposure to UVC radiation cannot exceed 1.7μW/cm2.
So, what is the data of our products? According to calculations, when a single light source is 10mW, if the distance exceeds 18 cm, the radiation intensity of the light source will be less than or equal to 1.66μW/cm2, reaching the level of short-term contact; and if it exceeds 52 cm, the radiation intensity of the light source Will be less than or equal to 0.2μW/cm2, ensuring long-term exposure safety.
Of course, because the product has two 10mW UVC LEDs, there will be intensity crossovers in some cases, so for conservative consideration, we will consider it as a 20mW light source for calculation.
Where the distance exceeds 26 cm, the radiation intensity of the light source will be less than or equal to 1.6μW/cm2, reaching the level of short-term contact; and where it exceeds 73 cm, the radiation intensity of the light source will be less than or equal to 0.2μW/cm2, ensuring long-term exposure Safety.
From this perspective, as long as you are not looking at the light source, you do not need to worry too much about an accidental behavior.
Of course, in any case, we do not recommend that users turn on the front panel of the air conditioner when the lights are on, because it is difficult for non-professionals to grasp the safe distance and time of exposure.
In fact, this is the reason why we chose the air conditioner as the killing carrier, and the design installation location is the back of the air conditioner front panel and the top of the inlet grille:
1. The height of the installation eliminates the possibility of children touching (like the ultraviolet mercury lamp placed in the room is really very dangerous. I have read a few news. When the child turns over the cabinet, he finds out the ultraviolet mercury lamp and plays with it. )
2. The installation position determines that there is no possibility of UVC leakage, because almost all UVC in the air conditioner cavity/top wall of the air conditioner will be absorbed, and there will be no reflection (because of the penetration of UVC and the reflectivity of ordinary materials Very weak).
The distance between human activities under the air conditioner determines that even if there is a UVC leak, its radiation intensity will be within the safe range of long-term exposure.
Because the dose of ultraviolet light to kill it is quite high, 36.9mJ/cm2, which is 3.42 times that of E. coli that is commonly measured on the market, which also means that the energy required to kill Staphylococcus albicans is much higher than that of E. coli.
and so:
1. We can kill the “kings” of Staphylococcus, and the “bronze” of Escherichia coli is natural.
2. If we kill Staphylococcus for 30 minutes, other bacteria with lower dose requirements will only take a shorter time. When you or customers compare the killing efficiency, in addition to looking at the final number, we also need to compare the strains.