Aurora
April 2, 2020, 2:47pm
1
Does anyone have any experience with germicidal UV-C LED bulbs? I’ve seen these pop up on both ebay and Amazon. Here is an example link:
https://www.ebay.com/itm/60W-Led-UVC-Light-Bulb-UV-Germicidal-Lamp-Sterilizer-E26-E27-Corn-Shape-Light/383477730259?hash=item59490dcbd3:m:mtu3n1ikpSf5RD86FvRebcQ
Are these real or are they a scam? I had not seen them until recently.
If anyone has testing equipment (UV-C photometer) I will gladly send one to you to confirm their output. The bulb is yours to keep after testing. The quicker the better!
You need 250 - 280nm wavelengths “light”. Otherwise you’ll get ayes damaging and expensive source of blue light only
Ultraviolet germicidal irradiation (UVGI) is a disinfection method that uses short-wavelength ultraviolet (ultraviolet C or UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unable to perform vital cellular functions. UVGI is used in a variety of applications, such as food, surface, air, and water purification.
UV-C light is weak at the Earth's surface since the ozone layer of the atmosphere blocks it. UVGI devices can produce str...
alpg88
April 2, 2020, 4:35pm
3
do not bother, one 275-280 uvc led cost around 10 bucks if you buy bulk, and that is top of the spectrum, less effective bandwidth, that light has almost 350 of them for 35 bucks, no way it is real uvc.
Aurora
April 2, 2020, 4:37pm
4
Exactly Quadrupel! My goal is to determine whether or not these bulbs emit light in this wavelength (& strength of emission). They are advertised as “UVC”. This implies a wavelength of 200-280nm. However the veracity of ebay postings is questionable. I’m hoping to find a 3rd party to verify the claims.
Joshk
April 2, 2020, 4:45pm
6
This Wikipedia page was interesting, probably a good read.
Ultraviolet germicidal irradiation (UVGI) is a disinfection technique employing ultraviolet (UV) light, particularly UV-C (180-280 nm), to kill or inactivate microorganisms. UVGI primarily inactivates microbes by damaging their genetic material, thereby inhibiting their capacity to carry out vital functions.
The use of UVGI extends to an array of applications, encompassing food, surface, air, and water disinfection. UVGI devices can inactivate microorganisms including bacteria, viruses, fungi, m...
“Sterilization” is often misquoted as being achievable. While it is theoretically possible in a controlled environment, it is very difficult to prove and the term “disinfection” is generally used by companies offering this service as to avoid legal reprimand. Specialist companies will often advertise a certain log reduction, e.g., 6-log reduction or 99.9999% effective, instead of sterilization. This takes into consideration a phenomenon known as light and dark repair (photoreactivation and base excision repair, respectively), in which a cell can repair DNA that has been damaged by UV light.
The effectiveness of this form of disinfection depends on line-of-sight exposure of the microorganisms to the UV light. Environments where design creates obstacles that block the UV light are not as effective. In such an environment, the effectiveness is then reliant on the placement of the UVGI system so that line of sight is optimum for disinfection.
Dust and films coating the bulb lower UV output. Therefore, bulbs require periodic cleaning and replacement to ensure effectiveness. The lifetime of germicidal UV bulbs varies depending on design. Also, the material that the bulb is made of can absorb some of the germicidal rays.
Aurora
April 2, 2020, 5:23pm
8
Who knows? Do You still believe in China after all this mess?
Lexel
April 2, 2020, 5:40pm
10
A real UVC tube or bulb would be extremely dangerous for any living being next to it
Commercial water&air sterilizers are completely closed so that no radiation can escape
UV sterilization light really can kill virus.
The reason is that it can break the RNA of the virus.
You can get more information from this article Can ultraviolet germicidal lamp kill the COVID-19? Yes!!
sb56637
January 20, 2021, 12:35pm
12
Hello, discussions and/or speculations and/or facts about the origin of the coronavirus are prohibited here, please drop the subject
To everyone else that responded regarding this tangent here, please go back and delete your posts. Thanks a lot.
drgentr
January 20, 2021, 2:12pm
13
here’s a roundup of some of the common ebay “UVC” offerings
