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Buyer Beware: This LED Bulb Sold As Germicidal Doesn’t Emit UV-C | Hackaday

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The germicidal lamp is designed to use ultraviolet light to destroy viruses and bacteria. However, not only can any ultraviolet light be used, but I came across an example of an advertisement that was advertised as having a germicidal effect, but some things were inappropriate.

I ordered a UV-C germicidal LED lamp on Amazon and received it a few days ago. From the very beginning, people felt suspicious: when using many different UV LEDs, I have learned how parasitic visible light from different UV ranges feel to the human eye. In addition, the suitable UV-C LED lens shown here is made of quartz glass. Compare this with the image I received from the top of the bulb, which has a soft plastic lens that may be opaque and degradable in the far ultraviolet range. The most important clue to the problem is the price. It is hard to imagine that a UV-C LED lamp with a wavelength of 253.7nm is made of more than 200 LEDs, in such a sturdy metal housing, it is only $62.99.

Despite the risk of unfairness, I decided to return the product. In my message, I bluffed that I measured the spectrum of the lamp with a spectrometer and its output was not in the UV-C range. The next day, I received a confirmation that the fraud was rewarded: The seller replied that they advertised the product based on the information provided by the supplier, and the wrong information was due to their insufficient knowledge of the product information.

Measured wavelength: It is not 253.7 nm as shown in the advertisement, but the peak is 394.3 nm and the dominant wavelength is 413.9 nm. It is not in the range of far ultraviolet C, but in the range of near ultraviolet A, which is of no use to destroying bacteria! The seller promised to remove the product from their store and kept the promise.

If you are considering buying UV-C LED lamps, maybe you should buy old-fashioned CFL germicidal lamps. I think viruses don't care much about new technologies.

You should probably deny that UV-C is quite dangerous, and you should protect yourself.

But this article is about fake UV-C, which is relatively safe. At least in terms of direct exposure: -D

That is half of the whole world. :)

I have a 1W laser diode that is completely safe for a while. (It may be static/poor handling.)

Can I sell you a lawn mower that is perfectly suitable for wearing slippers? Make sure not to cut your toes! Of course, if you open the hood and maybe remove some garbage from the carbohydrates, our guarantee will be invalid.

Obviously I know you are joking, but as someone who has used the lawnmower for many years, how does it actually make your feet stand up under the lawnmower when it runs?

Now, I can imagine all kinds of silly postures while holding down the throttle, but you must do all these silly postures purposefully. They will ask you to actually step your foot under the lawn mower. When used as expected, you are always behind the lawn mower, pushing it with your hand, and the lawn mower is safely 12" + from the bulldozer. Like I said, you seem to need to do something even Consider the matter of exit.

Hey, I used to have the pleasure of using an electric lawn mower. The safety interlock switch of this safety lawn mower has a catastrophic failure by short-circuiting itself in the closed position (not fail-safe, but dangerous).

->As long as the AC power supply is connected, the lawn mower is running, and the only way to "turn off" the lawn mower is to unplug it.

It turns out that the previous owner/user has let the lawn mower stay in the rain at least once, and the water rusted the spring + steel ball combination, keeping the switch in the "on" position.

The danger is not the direct blade.

Large rotating blade + gravel = high-speed projectile with toes level.

I know this happened twice. Two different people, separated by many years. Both pull the mower backwards (every time occasionally) and trip over things, hold the handle to relieve their fall (instinctively) pull the mower on foot

Heavyweight boxer Joe Frasier fell over with a lawn mower and drove to the hospital.

I once ran a lawn mower on my feet (it only ruined my army boots, no piglets were injured). I was in a short but steep descent, slipped, and the reflection of catching something caused me to pull the lawn mower to my feet. I immediately released the throttle/dead switch, but the inertia of the blades still made it spin long enough to damage my boots.

UVC is not safe for human skin/eyes. FAR-UVC (202nm-225nm) is safe and can also kill viruses.

This disclaimer can be placed where real UV-C lamps are sold. But basically, it's not even necessary here. I think the harm of UV-C is common sense. You also won't see a disclaimer on kitchen knives, which means don't stick them in your eyes (or any other body part).

You are a short-sighted assumption. It's silly to compare sharp blades with lights that look really cool when lit at the same level. Especially when there are other lamps that look very similar that are not dangerous. Put the UV-C lamp next to the lamp with bugs, and then randomly ask people on the street what the difference is...

In fact, even if they are not side by side, this is quite important. There are two insect control devices in my house, and there is a "swordfish" sterilizer on the stove. The UVA tube in the bug bottle opener is still coated inside the glass and "fluoresces" in the 400nm range. Swordfish’s UVC bulbs are transparent, and the light is the actual direct UVC produced by the gas in the tube. (All fluorescent tubes work in this way, and the coating on the glass determines the "color" of the light. UVC is very dangerous to the eyes. The WHO also warns against using UVC lamps for disinfection. At least it can cause skin irritation and at worst The situation is skin cancer.

Oh oh So, I ordered an insect and fly killer on eBay and compared the picture with what you wrote online. I am sure that the attached bulb is UVC. The good stuff failed after a few minutes. Replaced by ordinary fluorescent lamps and later LED lamps.

Knives are very old tools, and people are usually taught to use them safely when they are children. They are everywhere. Having six dozen different purposes is completely normal.

People waved burning lasers around... I think UVC warning may be needed.

"Someone is burning a laser... I think a UVC warning may be needed."

...In a distant galaxy.

The information is good, you should always know how to use any tool.

Yes, who doesn’t like that nursery rhyme...

Now you tell me...

There is a difference between tangible hazards and intangible hazards, the latter will affect you immediately-when you start hurting yourself with a knife, you will realize and stop before you suffer serious damage-those will be before you realize Things that can cause serious damage. This is why we have no warnings for knives or ovens, but for bleach, arc welders, etc.

That was my first thought. I just read an article about Hackaday about how to make your own sterilization room for STUFF instead of humans. My second thought is: what do they use in bug zapper?

Uh. "Zapper". electricity? Stunt problem?

I was thinking about the light used to attract them. You are right. Then there will be ultraviolet lights in the food service area. I will have to do some research. The trouble caused by the curious mind. Look! squirrel.

The problem with exterminators is that they attract beneficial insects that eat mosquitoes, but not mosquitoes. Therefore, it is counterproductive. But people have heard of ZAP and think they are effective.

Correct. We believe that many things are not the case.

It may be so, but I kill thousands of insects every night, so they completely cover the lights.

Just put a sticker on it that says "Do not look directly at the UV-C lamp".

I want to learn more about your article. I recently purchased a similar 60W AC100-2777V UV germicidal lamp.

…I am (or have been) interested in the same UVC lamp; please convey your findings and/or actions you have taken on it. …Very grateful.

If from 100V to 2.7kV: D, it is a pretty good power supply:

This is real. But is this also common sense here?

The knife is sharp. Laser blinds you. Acid will burn your skin. UV-C denatures DNA. Please take appropriate precautions.

I have a problem, I am creating my own file. I bought a 18-watt blue 464nm strobe light. It has been shown and recorded that adding strobe lights has an effect. I have been doing some tests, but I still need proof. I'm just a person. I know it includes distance. Any ideas. ?

Thanks Tim

Using an unprotected UV-C lamp can be dangerous because it can harm the eyes and cause skin cancer.

UV-C light destroys the DNA/RNA of the cells, which is the way to kill bacteria.

All gadgets with unprotected LEDs are scams.

In the best case, they will be UV-A, which is not dangerous.

When buying 1K in bulk, the price of a single 30-50mW UV-C LED is $10-$15, so the price should be the first warning.

Similarly, the efficiency of these LEDs is 5%, so the power consumption of a 50mW LED is about 1W.

If a lamp with 200 UV-C LEDs is real, it will cost $2000-$3000 and use about 200W of power.

The efficiency is 5%, which is a very bad choice for mercury vapor discharge lamps. They are more efficient. How do you "protect" the bulb? If the bacteria on the surface are to be killed, the radiation must reach them. Therefore, the only meaningful protective measure is to leave the operating room.

UV-C lamps are used for water/air cleaning and are encapsulated in tubes where air or water flows around. UV-C is not good for surface cleaning, because it destroys plastics, rubber and textiles with the same effect as sunburn, but much faster. Yes, the efficiency of this tube is 25% and it is widely used. These LEDs have special uses in portable devices. You can cover them with water, place them on metal bottles and sterilize them for a few minutes.

Does UVC penetrate water or kill bugs floating near the surface?

My experience in using them very effectively to kill parasites and cyanobacteria in the aquarium shows that UV-C does not penetrate water, at least within the distance (about 2-3 cm) between the test tube and the edge of the UV sterilizer component no problem. , I think).

For the relevant personnel, the UV sterilizer is separate from the aquarium, and water is pumped into it, so the fish will never be exposed to UV rays in any way.

This is a common type:

In fact, the effectiveness of sterilizing (UV-C) light to sterilize N95 masks to extend their use time is widely known. In fact, the CDC has recommended the use of ultraviolet sterilization (UVGI) as an emergency measure. As you said, the limiting factor is that UV-C degrades the polymer, which ultimately leads to the failure of the structural integrity of the mask (Lindsley et al., 2015).

Okay, this is probably the most common application. And it is much safer than public use. Obviously, I was influenced by bigclive's youtube video and he got a (real Hg steam tube type) germicidal lamp. He showed that it only operated for a short period of time and emphasized its danger.

Has anyone used far ultraviolet LED experience? Some light sources on the Internet classify far ultraviolet as 222 nm, while others are even below 200 nm. All sources claim that low-wavelength far-ultraviolet LEDs cannot penetrate human skin or eyes, so they are less dangerous. Does this also apply to plastic, rubber, etc. surfaces?

Many sources claim that far-ultraviolet LEDs are more efficient in disinfection than UV-C. The latter confuses me, because longer wavelengths around 257 nm are generally considered to be the most effective for fluorescence, while wavelengths of 280 nm are most effective for LED light sources.

I use UVC in a wound care environment-it disinfects the surface of infected wounds very well-so I know a lot about this technology.

254nm is the most effective UVC wavelength to kill microorganisms. Far ultraviolet light is about 222nm, although not as good as killing microorganisms, it is considered safer. Far ultraviolet C is still under investigation and is not yet ready. 254nm UVC can hardly penetrate the skin, so much so that many experts believe that it cannot even penetrate the dead cell layer that makes up the surface of human skin. 222nm UVC is even worse when penetrating the skin-this is actually an advantage because it is safer than standard UVC. A recently completed study used genetically modified mice. The mice are so susceptible to ultraviolet light that they are exposed to direct sunlight for only a short while, causing them to develop skin cancer. These rats were exposed to extended 222nm light without any problems. Encouraging results!

Think of it this way: UVA (in the sun) penetrates all the way to the lowest layer of the skin and can cause sunburn under sufficient exposure. UVB (also in the sun) will enter the dermis, although the depth is not as deep as UVA, but it will also cause damage to human cells. The UVC at 254nm can hardly penetrate the top layer of the skin, while the far UVC at 222nm is only a surface effect. It can still reach inside bacteria or viruses to destroy their DNA/RNA, because bacteria and viruses are very small-only a few microns in size-so DNA/RNA has nothing to hide.

Some free chicken – if you get a UV bulb that emits a lot of light below 200nm, it will produce some ozone, which can cause lung irritation. Some people want to use it as a "deodorant" effect, but it is usually undesirable. Generally, a clean bulb that emits most of the light above 200nm is safer.

Hope it helps!

I have tested these lamps with American Ultraviolet's UVC dose indicator card and the card did not change color after 30 minutes of exposure. Using real UV-C lamps, these cards will change color in seconds to minutes depending on the wattage of the bulb. In contrast, my real 14-watt UV-C bulb changed the color of these cards in 15 seconds. I also tested these cards with my UV-C 35w lamp, and it changed color within a few seconds of being close to the light and within a few minutes of a few feet away. This is not a real UV-C lamp.

Hi Todd, you really need a higher wattage to play the distance effectively. What do you think is needed to cover 200 square feet of room

I have been trying UVC LEDs because you said they are not efficient and consume a lot of power. They also generate a lot of heat. Many manufacturers provide aluminum substrate PCBs for UVC/UVB LEDs to dissipate the heat generated. You cannot install many UVC LEDs together in a corncob tube without significant heat dissipation.

Far ultraviolet is a wavelength that has been studied, and all signs indicate that it is safe for the human body. But many people think UV-C can. It's not. The far ultraviolet wavelength is (207-222 nm). This is an article discussing it:

The problem is that the UV-C emitter will never only radiate at 207-222 nm

"...In such a strong metal enclosure"

Maybe you should use a lamp to clean up bacteria.

That is the only feasible way. Unless the weather becomes hot enough to kill them.

To be fair, most people who are currently buying UV-C lamps do not fully understand how to use them safely, because exposure to UV-C can cause short-term or permanent damage to the eyes (trachoma, potato eyes/welder flash) and skin Exposure can cause rapid sunburn and skin cancer. UV-C breaks double carbon bonds at the molecular level, so any organic (live or dead-animals, plants, paper, clothes, etc.) or synthetic (paint, plastic) will be permanently destroyed. I think that if the UV-C light source is used incorrectly, the damage they try to protect themselves will be far greater than the chance of death from COVID-19. At this exact point in time, I actually prefer to let people who don't understand what they buy to sell the wrong product, rather than let them add unnecessary pressure to the medical system in this crisis.

My personal damage to short-term/long-term exposure to UV-C is similar to that caused by soft X-rays, but unlike X-ray damage, it is limited to molecules with double carbon bonds, and is limited to exposed surfaces ( Can not penetrate deeply beyond the surface).

No, UV-C is not specific for double carbon bonds, it can break many molecular bonds.

"Ultraviolet rays can dissociate relatively strong bonds, such as the dioxygen (O = O) bond in molecular oxygen (O2) and the double C = O bond in carbon dioxide (CO2); ultraviolet light can also dissociate relatively strong bonds from compounds such as methyl chloride ( CH3Cl)) remove the chlorine atom."

To be precise, it depends on the matching of energy, and yes, photolysis is not only applicable to certain double-carbon bonds found in DNA. But carbon bonds are most directly applicable to human flesh.

UV-C has a wavelength of 280nm to 100nm, so in theory it can break any bond with a bond energy of about 427 to 1200 kJ/mol.

But the actual situation is that for a typical quartz mercury UV-C lamp, there are two main peaks in the UV-C range.

It has a peak from 200nm (600kJ/mol) to 160nm (750kJ/mol), with the largest peak near 183 nm (655 kJ/mol), and a larger second peak from 260 nm (462kJ/mol) ) To 230nm (521kJ/mol). ) Reached a peak near 252 nm (476kJ/mol).

Therefore, any bond at that bond energy can be broken,

E.g

C = C 602 kJ/mol

C = N 615 kJ/mol

O = O 494 kJ/mol

It’s crazy, maybe they just follow Monty Python’s "Architect’s Sketch" (

).

Can anyone explain to me why you want to buy a 4k UV-C LED bulb instead of the pl variant for 12 yuan on earth? This sounds ridiculous. The PL tube version is very efficient and is a common type of aquarium. Seems a waste of money

Is there actually a source of UVC in the millions of mobile phone disinfectants sold? zero!

I think at least some of the UV rays are weak (if UV rays are not included, it is still dangerous).

Mobile phone disinfectant?

Did Douglas Adams not mention those in HHGTTG?

I think that is just memory of the game.

Is this UV even safe for the display itself (OLED, LCD material)?

In fact, my experience with UV lamps is usually bad. They cannot eliminate UV Eproms in the 365nM range, and cannot replace CFLs to replace mosquito killers in other close ranges... Therefore, so far, there is no chance to replace old CFL lamps with more durable (maybe) technologies.

Elliot encountered the same problem, namely unable to erase EPROM. He finally tried a tanning lamp and ran into even greater trouble for it:

ew! For a while, I thought that "big problem on his hands" meant melanoma!

Everything is fine here! There is a small fire in the basement, but this is why there is no carpet in the workshop. :)

The solution is to use a $15 EPROM eraser and wait patiently for shipping. With real germicidal UVC bulbs.

Look for "3W Ultraviolet Bulb E17" in suspicious locations commonly seen in the west. Costing $2, this is a real UVC. I checked it with a spectroscope.

It looks a bit like a refrigerator bulb. It would be cool to break into the refrigerator from time to time for UV-C cycles, so groceries can be kept longer. There is already a door switch, so if someone opens the refrigerator during the cycle, you can automatically turn it off...

These are not ordinary light bulbs and cannot be operated directly with AC or DC power. These are gas discharge lamps, just like fluorescent tubes. They must be ballasted or they will pop out the first time the power is applied. I use these exact bulbs in my homemade UVC eprom eraser. The way I drive them is to use a 120v to 24v 400ma AC transformer. Then, I have a 41 ohm resistor, and two 82 ohm 5-watt ceramic resistors in parallel. This provides the bulb with the voltage required to reach tens of volts. Once it is broken down by the arc, the voltage will drop to the bulb's 10v working voltage.

One of the bulbs will eliminate static electricity in about 5 minutes.

If you look at one of these bulbs at first glance, they look like ordinary incandescent bulbs. They work in such a way that when they cool, the filament emits light to emit ions. Then, when the bulb touches the arc through the tip, the resistance of the arc is lower than that of the filament, so the filament is mostly out of the circuit. If you see that one of these bulbs is activated (with proper eye protection), you will see that it is working. The filament glows for a second or two, and once the arc hits, the filament goes out.

These bulbs will run on AC or DC power, but you really should use AC power. When using DC, you will only see the glow on one side of the tube. I don't know if it is harmful to them, but it is almost certain that the output of UVC will be reduced by half.

Did you know that an agent full of EPROMS can be used to measure UV exposure time/intensity to determine how good the sterilization effect is?

It will tell you that the bulb is not doing what you expected. But this is not a reliable indicator.

The erased EPROMS contains one (0xF​​F). So it doesn't help. At least your test EPROM needs to contain zeros. But you must compare the dose required to erase EPROM with the dose required to eradicate the virus (or other pathogens under consideration). I think there are better sensors.

Does the random technical product advertised on Amazon do not match the description? I'm sure this never happened.

This is the real clue of the fake: 275nm led light-emitting diodes are priced at $18 each and $10 per thousand in wholesale quantities. (Mouser) Therefore, a lamp with 200 lamps will cost at least a few cents.

CFL-type UVC lamps are available on Ali at prices ranging from 8 to 40 watts for $10 to $30. The United States and surprisingly (supposedly) have stocks. A few days ago, I ordered a couple and received a shipping notice within 24 hours.

The correct solution * example.

*The economy becomes part of

I think the seller of these items must be locked in a room with Covid-19 aerosol and a lamp.

This is not one of the common frauds in China, which may cause many deaths.

The analogy is a disinfectant gel, a rag or a liquid without any actual disinfectant.

This is not a simple fraud, this is a case of manslaughter

And, has the store on Amazon continue to exclude the device from its store?

After a quick search for "UV-C germicidal LED lamp" on Amazon, the number of clicks for lamps with a price in the range of $50-$100USD increased greatly.

If the Amazons think there is no need to do something about it, then all we can do is continue to spread the information.

The lid on the LED shown is almost certainly not clear glass, but fused silica.

If you study the UV-related documents related to 380-400nm, you will find that 300nm has the highest virus clearance rate in the solar spectrum at 21-55 minutes @ .05-.8 Joule/W/cm2, while on the ground Yes, and the working principle of 400nm takes only x times the time, and virus inactivation at 1-4 watts or 400nm per square centimeter requires 1-8 hours. Instead of 10 ms @ .004J/cm2 at 253nm. If you want to eliminate it immediately, use uvc. UVA will also inactivate the virus strain. So yes, the light source can inactivate the virus, but it must be all day, if not 24 hours a day, then you will need more than one. Enough viruses will be deactivated so that the remaining viral load is low enough that the human body cannot handle it. The best frequency range of ultraviolet light is 210-222nm. Its wavelength is very short and will not penetrate the skin or eyes. 400nm is also considered safe. But for different reasons.

Therefore, while waiting for this kind of bulb to sterilize food, you will be infected about 4 times as much, haha. Therefore, technically speaking, if they cancel the wavelength range in the advertisement and just advertise it as a bactericidal uv lamp, will they be covered?

Thank you. I also bought one of them... I thought the price was too high, but it didn't slow me down. Where can I buy those flip-flop-friendly lawn mowers? What about my new paperweight?

Although these bulbs are not "fungicides", if you happen to be lying with a pile of black light posters, they are an important source of UV-A. ? Also a great UV lamp for your insect repellent. The ultraviolet rays should be bright enough to bring them in from the next county. ??

The lamp you want looks like a rectangular-wound CFL, but it's clear. The power we have is 15W or 25W, and they can be screwed into ordinary E26 lamp holders. Ozone will emit a noticeable smell after being turned on for a few seconds, telling you if you are releasing a lot of UVC. These are useful for many things. I put an inverter on an inverter, and the inverter is run by a timer for a few minutes every day in a solar house in the woods. It destroys mold and seems to disturb bugs and small animals. When I opened in summer, this place smelled fresh and delicious.

UV lamps based on mercury vapor emit intensely at two UV wavelengths: 253.7 nm (UV-C) and 185 nm (so-called Vacuum-UV or VUV). The latter wavelength produces the ozone you smell.

Some mercury-based UV-C lamps now have a coating on the quartz shell that can block 185 nm and allow other coatings to pass through. You have an uncoated version. Ozone is toxic, so I hope you dry it before taking up the space. On the other hand, ozone penetrates areas that light cannot reach. This combination is more effective than any one, so it is a two-edged sword. the best! Reply

On the bright side, if you or anyone you know owns a resin 3D printer, then this wavelength is very close to the correct wavelength for building a post-curing box. I can’t find a useful data sheet on how wide the useful bandwidth of the 405nm nominal resin is for curing, but I took the liberty to guess that the bulb will emit most of the useful light in the correct part of the spectrum.

If your budget-conscious 3D printing technology can find use in your home laser label arena, or start a crazy carnival, then the possibilities are endless!

I want to ask if there are other uses for this, and then try to return it, but you answered, so they may still have a market for these products without having to lie to people.

You're really great! Originality, attention to detail and documentation!

Confession, I know very little about it.

Quick question, is there a way to change the wavelength of the bulb? That is to change it from 254 to 222 (far ultraviolet)

Your question in the visible spectrum is whether there is some way to convert red photons (625-740 nm; 1.65-2.00 eV) into shorter wavelength high-energy orange photons (590-625 nm; 2.00-2.10 eV). The only way I can think of to change the frequency is to accelerate the light source to close to the speed of light and move it towards you (Doppler blue shift). However, using only different elements (and you don't need as much space), it emits and absorbs in the correct part of the spectrum, which is more energy efficient. I might suggest using the same/more dangerous deuterium lamp (the emission wavelength is about 190 nm to 400 nm-look for "deuterium emission spectrum" in the browser of your choice and compare it with "low pressure mercury emission spectrum" Compare).

What I want to ask is, if you don’t take proper security measures to protect yourself, don’t blame me. If you can’t sleep for weeks because the inside of your eyes feels like sandpaper, it’s not my fault. If you have skin cancer, it is not my fault.

Thank you for your reply to the truth. I apologize for not putting in the nano unit.

To clarify, I hope there is a way to convert the light source to 222 nm light.

But isn't the deuterium lamp used for high beam technology? My understanding is that this is Russian technology. They use lighted filters to focus on the 207-222 series.

I also bought one at a high price early on. I contacted the seller through Amazon and requested a return. I received a full refund the next day. No instructions were given for returning the unit; therefore, either it is too expensive to afford (in part) the return shipping cost-then how will they use this (now useless) kit?

I think this will be a lot of face in this industry in China. Considering the timing of this, people may risk their lives to trust the placebo product; that is a crime.

Finally, I want to know how much this big mistake (tm) will cost? From design to manufacturing to middleman. Everyone loses investment. Or maybe it has always been well known and was originally a scam, just to get as much "rube" money as possible, hold it as much as possible, and return only what they were forced to provide.

Everything looks terrible. I am glad to announce this news as a show of hope.

Interestingly, the bulb even shows a "germicidal lamp" on the right side of the base. But the data sheet shows the UVA spectrum, and regardless of whether it has a certain sterilization ability, it is not part of the UV spectrum commonly referred to as sterilization. For many people who have purchased these products, I feel very frustrated, thinking that they will disinfect the bedroom or living room within an hour or two, which may take several days without taking up space without interruption. To use.

I'm glad you got confirmation from the seller that their "UVC" "germicidal lamp" is indeed not as good as the advertisement. I'm not surprised, they just refunded your money because it was easier to do so and keep other bulbs on sale. I hope that a new, suspiciously similar list will appear soon, selling the same bulbs or slightly changing part numbers, etc.

Unshielded UVC lamps should not be sold to consumers without education about the dangers and dosages of a large number of inactivated microorganisms.

Thank you very much for testing this and publishing the results! And thank you to anyone who sent me the link on my Amazn question. After seeing the posts there that someone had tested them but they were not properly read, I tried to cancel my order a few days ago, and the seller responded by sending my package the next day, thank you. I want to see if anyone can do the test, but it is not necessary now.

If anyone has time to have some questions. UVC fish tank bulbs and some equipment sold are advertised at 254nm. Some countries also claim that they also release ozone. Some say no, but commentators pointed out that they smelled ozone. After treating the room with a 254nm bulb, is there any adverse effects on breathing air? Do the bulbs they make emit 180nm and 254 ranges? Should we be tired of the light bulb advertised on 254 that also produces ozone-generating range?

Some people claim that the far UVC frequencies indicate that they are the first to separate them, discover their usefulness, and produce products based on them. They published a response in an article the previous week, stating that a university has done a lot of research on safety and is cooperating with foreign competitors if they produce products (which they already own) will protect their patents. I guess this means prosecuting. I didn't make this story interest anyone, but to me, it seems very important, considering its benefits in epidemics and the safety hazards of people throwing uvc bulbs. In addition, I think that strict mercury import laws have been implemented in the past ten years.

I think amateurs will be able to advance technology faster than a few companies and universities. What are the obstacles to manufacturing LEDs in the 207-222 nm range, is it even possible?

Amazon is crowded with these fake LED "insect" lamps for sale and their LED variants. Some people even claim that the ozone produced by their LED bulbs needs to have a shorter wavelength in the "vacuum-UV" region below 200 nm (in terms of wavelength, vacuum uv is between UV-C and soft X-rays), which is completely beyond The range of any LED can emit (for experimental aluminum nitride devices, the current record is 210 nm).

Commercially available UV-C LEDs are extremely expensive-more than $500 per LED, and have very low power, usually less than 1 mW.

So, frankly, some people claim that their $60 LED bulb has sterilization capabilities.

The quotation is the price of 255 nm LED from Roithner-Laser, Austria. The 275 nm CEL LED mentioned in OP has been listed on DigiKey's website. The bulk purchase price of a model that is still in stock is $127.40. As a general rule for UV LEDs, the unit price increases exponentially as the wavelength decreases, and the radiant power decreases with the expected component life.

Are these things like making white LEDs for computer screens?

Some research tests have shown that 405nm can kill Salmonella and E. coli.

A company uses 405nm in its "occupant safety" hospital lights.

It’s not that the seller will misunderstand the wavelength

A blue LED used in combination with a yellow phosphor to generate white light generally has a wavelength of about 460 nm.

How about Philips, Osram, and Sankyo Electric?

There is a difference between GERMicidal and VIRUcidal. In these crazy days, I think it's easy for laymen to get confused. Technically speaking, hand sanitizer is just a disinfectant. It takes many years to obtain a killing claim approved by a US government agency. Therefore, even if ethanol can kill the virus (even under the influence of sunlight and time), no one will spend money to obtain a killing claim. It takes two minutes for a competitor to "blink an eye", that is, their formula is the same (as in most cases), so it is essentially the same. . . Hand sanitizer in this picture

Big thread. I was about to fall down this rabbit hole.

I am interested in pulse germicidal lamps, about 20hz. Simple square wave switch. Does anyone have an idea about this?

I might pay $$ for low-efficiency real UVC LEDs, or I want to know whether the small 3w E12 lamp can effectively pulse with the right power supply. Does anyone have an idea?

Quartz low-pressure mercury UV-C lamps use the same technology as ordinary fluorescent lamps, but there is no special Er coating inside, which can convert UV into visible light, and quartz is used instead of glass, because glass will prevent the spread of UV.

So what you want to ask is whether you can generate 20 pulses per second on the arc inside the fluorescent lamp. When a fluorescent lamp is turned on, it consumes a lot of current because the initial arc is actually a short circuit and this is where the maximum power is used. Traditionally, electromagnetic ballasts (large inductors) limit the current to prevent the fuse from being blown. So if you flick it 20 times per second, it will consume a lot of power due to high inrush current.

To be honest, I don’t see the problem of pulsing the UVC light source. If you are looking for a lower intensity light, please choose a lower power lamp.

For a dance club, it would be cool to gate the fluorescent poster on the wall, but if you just want to reduce UV exposure, please turn it off as soon as possible.

This is the reason why you only insist on using proven and true CFL or linear UVC bulbs. There are far fewer scams in that space. Even non-ozone generators produce small amounts. Put the UVC bulb in a small room like a bathroom, then close the door and run it for 5 minutes. If it is a real UVC tube, you will be able to smell it. Without exposed bare chips or quartz glass windows, there would be no real UVC LEDs. The few real UVC led lights I have seen usually look like old-fashioned metal can LEDs with quartz glass windows on the ends. Exposure will absorb UVC and rapidly degrade from UVC. If you see an LED that claims to have UVC, and it's in a standard epoxy LED housing, it immediately becomes a scam.

I noticed that the light is very blue when lit, but I also noticed that white objects have a black light effect. Therefore, I conducted a banana oil test, put a label on it, and exposed it for 1 hour. 5 inches away. After an hour, the exposed area became significantly darker. Use a regular glass to do the same between the lamp and the banana for 1 hour. There is no darkening or color change in the area around the sticker (no difference). It smells, but there is no feeling after a thunderstorm.

This is a test report sent to me by a seller of the lamp to prove that the lamp produces UV-C.

As you can see, the test report shows that there is no UV-C.

The seller could not understand the report, or thought I could not understand the report.

I see many comments here about how dangerous UV-C is. The latest entry in the MedCram series on YouTube specifically covers this topic. When making such statements, the term "UV-C" is too broad. Specifically, it has been found that 200-222 nM UV-C is not dangerous to the skin or eyes, but is very effective against bacteria and viruses.

I am not saying that all general-purpose UV germicidal lamps are safe, but the fact is just the opposite. Not all UV-C lights will bring cancer to you and cause blindness when powered on.

If where can you find one of these "safe" lmk UV germicidal lamps. I should say whether they are in production and cost less than $4,000.

If this bulb does kill anything, then it may be the safest germicidal lamp. A laboratory test showed that a large number of ecoli in a petri dish was killed at 405nm at a wavelength of 15 mW/cm2 for 1 hour, but 5 mw had no effect within 2 hours. An Amazon reviewer said that the heat emitted was 3.2 megawatts per square centimeter

At least many Amazon ads with negative evidence have been deleted. The problem is that it has deleted the real information.

I posted the same document, Steve. I want to know if there is a hack that can reach 222 nanometers. There is a company that produces these items. My understanding is that they have a patent and are currently waiting for FDA approval.

Most UV-C germicidal lamps have a wavelength in the 250+ nm range, which is dangerous to humans (cataracts and skin cancer) and should only be used where there are no humans. 200-222 is safe, and many reliable scientific tests have been conducted on these pages. Amazon sellers (almost all sellers) omit the wavelength, and few offer 222nm lamps. Sellers on AliExpress and Alibaba have proved this, but in my dealings with these two companies, they usually don't know much about their products, so they think that ultraviolet light is ultraviolet light. Well, no. Yes, quartz glass is required, so LEDs are suspicious.

I confirmed what the others said. The "corn-type" LED UVC bulbs that are easily found on Amazon and Ebay are fake. I ordered 2 pieces from Amazon and 2 pieces from Ebay. They do not emit UVC or even UVA/UVB light. I confirm to use agar and cheek exchange first, and then use radiation dosimeter to point (

). Both methods confirm that the bulb is just a beautiful lamp, without the smell of ozone.

Someone should file a class action to ensure that these offensive companies stop the lawsuit. Apart from the stolen money, the real problem is that frontline clinicians believe they are items (phones, keys, personal PPE) disinfected at home after get off work and further infect their friends and family. This is too bad.

Class actions should be directed against eBay and Amazon to promote fraud. For eBay, I tried to inform its legal department that if someone relies on light instead of other sanitation methods, its convenience may lead to death.

I bought one of these corncob-style LEDs from eBay and disinfected my wife's scrub.

This is also false. There was no smell, but I didn't expect anything at the time.

I just bought some UVC dosimeter points and found out that the light is fake.

Stick to bulb-style UVC lamps. Make sure they emit an odor. If you are like me and are curious how to know how long to use, please buy a dosimeter online from a supplier in the US or Europe.

I will no longer buy Chinese craps. They lie and deceive you in crisis situations. Now how to figure out whether these Chinese masks really work?

Confirm that this 60 W germicidal bulb is fake (no UV radiation). I measured a 20w 20W mercury vapor bulb with a 200-800nm ​​spectrometer, and its spectral line was just above 250nm. Then, I measured this 60w germicidal bulb. It has a spectral peep point at 450nm and a saturation measurement at 500-550nm, but there is no light above the environment at less than 400nm. I will send the plots to ebay and Amazon to see if they can be banned.

Hello there

I bought a mobile phone UV sterilizer. Supper fakes make you laugh. Glowing plastic rods, not mercury bulbs!

Contacted Amazon. They said I will get a refund and they will investigate the issue. But I don't think they have changed anything.

It seems stupid. But all I can ask is to post a question under as many products as I can provide. I haven't started yet. Please tell me what you think and how to improve it. I don't mind taking the time to post questions. All I need to do is to make sure that I am issuing a true statement.

Thank you.

here is:

Hello there.

Are these devices equipped with mercury lamps? Because LED cannot effectively sterilize.

Only mercury lamps can produce light with a wavelength of 253.7 nm, which is most effective for microorganisms (such as viruses).

Now that you know, it may make you legally liable. Please study the principle of ultraviolet sterilization and carefully verify the equipment to avoid accidental injury to personnel. Your product is very strategic and important. If feasible, lives can be saved. If not, it needs life.

After studying, I bought these FAKE UVC lamps. I advertised on eBay and listed it as FAKE UVC LED Corn Frame Bulb.

I bought two of them...oh, sorry.... But my problem is that I put one in the room downstairs, closed the door and left it for half an hour. If it is fake, I believe that after reading the comments, why? Is there a strong smell...my wife smells it too...smells like bleach...I am 73 years old and a retired electrician from COPD, so I am worried about ozone, but it seems that after reading the comments Can't... any physical help? If these fumes are harmful, I don't want to use it as a "pretty" error of "$50"... Only used once... Does it just burn on the first use? Thanks for listening/reading...any ideas? ? ? ?

I don't know what is harmful, but I don't know any cheap LED that can afford UV-C. All the UV disinfection lamps I have seen look like fluorescent lamps.

I also doubt that if you are going to cover the entire room, you will successfully disinfect _anything_ within a reasonable time. In addition to walking inside under bright conditions and the danger of ultraviolet radiation from the eyes and skin, the important factor that kills viruses is the power per square inch of surface area. It is best to put the bulb in a small box to prevent exposure of the bulb and to absorb more ultraviolet rays on the object to be disinfected.

If the light bulb smells like something, I will worry.

It must be fake. The source of the odor may be the overheating of some electronic components in the lamp, especially if it is combined with inferior FR4 resin or phenolic resin used for printed circuit boards. The best option is to return the product (if possible) and order UV CFL lamps for less money.

thank you very much……. This is the most logical explanation so far. ...I am an electrician, and sometimes new electronic equipment emits an unpleasant smell at first. We call it "burning"...such as shellac in a transformer, etc...So if this smell disappears, do you think I can use it as a "pretty blue light" dialogue segment? By the way, there seems to be more on Amazon...I will do everything I can to prevent people from buying these pirated items...Thank you again and let me know if you think I can hype this thing or just throw it away...They don't Will get it back or refund

I want to read this book before I buy products from Amazon. After finding a legitimate video on youtube, I tried to return it yesterday. The seller still won't give me a full refund and hopes that I will ship the product to China. Better than opportunists! Thank you for providing the facts.

These are still all over Ebay in many different shapes and sizes, and are still in the Amazon region. Can you consider writing a new article describing how to distinguish between genuine uvc bulbs and counterfeit uvc bulbs? Only one UVC LED SMD will cost five to ten dollars.

After two inspections, I did a lot of research, a lot of research is based on this website, and a few things are obvious... If it's talking about LEDs and the price is less than $500, it must be fake... The banana test... works.... I ordered a bunch of things and I can return them so far, but today I received 2 folded wands, which look real...about $50 each...say UVC and 253.7nm, very good... . 3W bulbs are only suitable for small jobs, but if it’s really good,...have not done the banana test, then it will reply to you, but it must be all bulbs that look like corncobs with a whole LED Is false, almost all LED = false

I have never heard of the banana test. Thank you

I bought a UVC dosage card on eBay and found that some of the lamps can kill bacteria, while others cannot send the non-working lamps back to Amazon.

In this great and magnificent article, the most important thing is the original author of this article, and all here who really have UV-C dosimeters, spectrometers, etc., and really know this job professionally in the smartest way Personnel. What they can do here to other public readers is to at least give some examples of eBay and Amazon direct link suggestions, what UV product is the best choice, and it is definitely not a fake!

For example, can someone recommend to the US and EU markets to buy some real UV lamps on eBay and Amazon to disinfect rooms, basements that use molds to prevent moisture, and disinfect masks in this corona crisis?

Thank you and sincere regards! :)

I bought these "UV-C" LED 60W corncob lamps from eBay for £30, and soon suspected it was a fake. I let it be checked with a laboratory-quality UV-C instrument. At 5 cm, it produces almost no UV-C, and its measured value is 7 microwatts/cm². Approximately the same level as household cool white GU10 LED bulbs. Compare it with a 72-watt mercury vapor disinfection lamp; at 5 cm, the UV-C intensity is 7.17 milliwatts.

As early as a long time ago, eBay has been aware of these fakes, but eBay continues to encourage such fraud. I will see this type of action against eBay's class action.

Ebay continues to promote sales of FAKE UV-C lamps.

Last spring, I complained to BBB about eBay advertisements. The advertisement allowed false promotion of these advertisements. I encourage all those who were deceived to do the same. I could not pay for Amazon, but I did get a full refund from them, but this is not an excuse to continue selling these allowed. They can also cause fires. Now, there is more information on the Internet, and tests on "uvc" led products have been conducted on YouTube, but 6 months ago, there was little relevant information. They simultaneously sold millions of such types to American consumers. product.

I have a few uvc glass compact bulbs and they seem to work well. Kill the mold on the damp bathroom ceiling and keep it clean for several months. Unfortunately, they are not manufactured onshore, are often mislabeled (o2 or not), and still commit a lot of fraud on prices.

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