It’s not that bad, really. Except for your eyes, UVC isn’t a big concern because it can’t penetrate very deep. However, UVC mercury vapor lamps also emit UVB and create ozone.
@@GRBtutorials _"UVC mercury vapor lamps also emit UVB and create ozone"_ A lot of modern UV-C mercury vapour lamps filter out 185nm with doped glass (I think they use gallium) so no emission line around 185nm, so no Ozone.
Jonny Wilson UVC can’t penetrate skin enough to get to live cells (but it’s still dangerous, especially if you have an open wound). Maybe it can burn the outer layer of dead skin, though. However, UVB can, and they produce a fair amount of it.
Now that you have a calibrated test platform, how about trying some cheap vs expensive "UV" glasses and goggles to see which really protects your banana.
Epic. Some cheap protective glasses are rubbish, it’s worth spending £50 on the correct wavelength pair. You only have one set of eyes. Though I must admit the glasses I buy are for laser flash protection.
@@rogerhargreaves2272 It is definitely absolutely NOT worth spending $50 dollars on a pair of goggles for UV protecting capability unless you are talking about laser radiation. Literally any $2 pair of polycarbonate goggles will block practically everything below the visible range and are perfectly fine for incoherent common UV source blocking like for germicidal lamps like this. UV laser blocking is more complex, it's worth buying from reputable sources and spending more in that case.
Muonium - I can’t agree with you more on that one. Mine are for use with powerful lasers; so it’s not worth compromising. I get specialist ones shipped from the States.
@@Muonium1 They don't block everything. A simple test is to use a piece of paper marked with a fluorescent marker and then place the glasses or goggles between the lamp and the paper. Even the expensive ones pass a small amount of UV. For lasers, you are correct - it is important to buy the best ones to protect your eyes as even a short flash can be disastrous.
This is probably the most affordable UV lamp test out there, actually. Now i understand why, when bananas were an expensive rarity in Soviet times, also sold green, you were supposed to put them in dark place for longevity. Previously i thought this was to avoid heat, and not exposure to sunlight. This technically could also make bananas suitable as a medium for photography using a pinhole camera with sunlight exposure. Or a medium for banana art, in which a stensil is put on a banana and exposed with UV light. Oh, the bananossibilities.
You could print black and white film negatives on a clear film and make a banana skin canvas. Then put the film with the image on top of the banana canvas and expose it to UV light to "develop" the image
A few decades ago I did banana skin photo's using black n white photo negatives, placed over banana skin exposed to a small UVC lamp for 5 to 10 minutes. Got some cracking good photo's though after several shots with the same negative, the negative fades quickly. Was a fun and rewarding little experiment to do.
My concern is how hot the fluorescent light may get. It's possible that the heat from the fluorescent light gets warm enough to discolor the skin of the banana. To isolate this, I'd suggest keeping the lights a few inches off the banana, and use a fan to blow cool air across it, to make sure heat didn't cause it to discolor.
I’m pretty sure banana skin became brown because of the heat. That happens when you heat it up. I’ve tested my UVC light with nana but the distance was much larger and it didn’t turn brown.
What really works great to see UVC, is a broken fluorescent light tube, but you need to shine on the phosphor directly without passing through the glass.
I do encourage your videos as it is a joke how many people are thinking that these DISCO lights are germicidal. Thank you for your information as it is a great help. I know alot about uvc lights as I used to work in a petshop where these lights (uvc lights) where used for getting rid of contaminants in pond water. Thanks to your videos I know more then I did about uvc that it can harm the skin and its benifits against germs. Keep up the good work Clive as u think it is making an impact. Many thanks James ❤️
I brought one of those for only about £3 on eBay and was also skeptical about it's UVC claim. However, when I put EPROMs directly on top of the mini UV tubes it erased the EPROMs in about 10 to 20 minutes. EPROMs require UVC to be erased so I guess the UVC claim is true. I just hope the clear plastic clam shell covering the tubes blocks the dangerous C spectrum!
Apparently purple disco lights also give you purple fingers! Thank you for providing us with all these UVC videos. I know it was initially against your better judgement but we kept pressing.
I have the lamp on the left. I read somewhere recently UV-C harms plants. I have an aloe vera plant as well as a few other house plants that have't been well and I couldn't think why, yep I burnt them, they have gotten better since.
A UV-C lamp is highly dangerous and not to be used for anything but sterilization/desinfection. Plants prefer the visible spectrum, ebay has lots of red-violet "grow lights" which are a bit more efficient than white lights because they leave out the green-bluish component. UV-C damages plants but they should recover if it wasnt too much damage. UV in general is not beneficial for plant growth. Grow lights are what you are looking for.
@@drkastenbrot yes I understand. The plants just happened to be in the same room I was treating. I knew about dogs and cats and I wear the proper glasses to go in and out. There seemed to be a delay in the plants getting injured and I think they may have had a growth spurt at first followed by darkening of the aloe and palm fronds falling off.
Thank you for another excellent video, Big Clive. I see that there are several good TH-cam videos now, about fake UVC lamps. Some have tested with proper UVC meters too. Hopefully Amazon and Ebay will stop listing these scam LED lamps.
I wonder if the germicidal lamp is actually heating that tape on the UVC-irradiated banana, causing the peel to turn brown in the area of the tape covering. Either that or the camera got a bit confused differing green color from yellow background. Still, this test is actually valid. Many UV-C LEDs I have seen (and considering buying) are up to 200 milliwatts which is honestly nothing to write home about, in fact they are dimmer than large Mercury UV-C lamp (which is a bit weird because some powerful UV-A LEDs already outperform the 40 feet blacklight fluorescent lamps - Nichia makes decent blacklight LEDs like NVSU233, alas).
I found my wife's old Pollenex Toothbrush Sanitizer yesterday, complete with a warning label that it uses UV and that eye and skin damage could occur if used with the cover off. It has a GTL3 size bulb and a 20VAC power adapter. I "borrowed" it to erase 80's "windowed" UV EPROMS. She can have it back now ... unless I can figure out how to jam a banana in there.
@ShiDaFu Now you know. If you still have any older devices with them in it, you might want to make sure their labels haven't dried and fallen off. ANY stray light could slowly degrade the programming.
Great to see this confirmed in another video :D Coincidentally I tried this yesterday with my real UVC booth setup to confirm it was all working, and I am happy to say it is. I eventually got a refund for my fake ones off eBay, although I did have to resort to eBay stepping in after a mandatory 8 days.
This video is a wonderful public service. I recently got a little UV lamp like the one you included in a previous video, so I trusted it more ... now I dont have to trust it, I can test it. Thank you, and thank you to the viewer who gave you this idea!
Awesome thanks, I noticed that happened to my bananas too, nice to confirm I have a working lamp. This has been the only place if found with concise information on these lights. Most aren’t very clear what they’re talking about and don’t go into the danger at all. 👍
Wondering if this is actually making the fruit ripen more quickly? I like my bananas very ripe ( sweet ). I usually wait till the skin goes mostly blackish but not mushy.
So in these trying times, I'm still working. I have one or two days a week doing retail on top of my regular work. I've been looking for something like a disposable touchscreen stylus so my customers can sign their signature without touching the screen. Best solution so far? Baby carrots. Interested on doing a video about that Clive?
Some phosphors only fluoresce under UV-A. This is why you can’t make old fluorescent tubes glow under UV as the glass tube blocks it. If you were to break the tube, (not a good idea) and present the phosphor coating to the UV-A it will fluoresce if there is a short-wave content. Won’t work for black-light as it is glass filtered.
Might want to get a little info to add to this test. What is the wavelength range to kill viruses? And optimum nM. What is the wavelength that kills viruses but produces ozone which is dangerous? What are the safe lamps? Or what safety precautions should be taken? When I did the banana test, it was clear that the sunburned part was the only part getting UV-C disinfecting. So any item to be disinfected would have to have UV reflected(shiny aluminum foil seemed best. Normal mirrors not so much. The glass of mirrors blocks UV BEFORE it reflects off the mirror coating on the back. ) Meaning the UV could reflect onto all sides, or the item rotated for more thorough exposure.
Clive Thank You for all the info that you give us. I ordered one of the Ebay (So called) UVC devices that you had shown. The reason I wanted it was for finding leaks with the dye that you can as to coolant systems in a vehicle. The one I ordered was the black wand style one you showed.
A real UVC won't light up fluorescent paints or posters, they're tuned for UVA. They will light up a CF phosphor though, but the glass envelope of a CF is not supposed to pass UVC out from the mercury vapor inside.
@@TD_YT066 One of the ones that Clive showed in one of the other videos on this topic is what I got and it makes dye glow very bright. It also works well for cat urine. Do you recall the long black one he showed some time ago? That is the one I got. Nice for dye locating.
Plants do detect UV light with proteins like UVR8, although that one is for UVB. So, the banana changed color due to UVC damag e/ damage response on the cells, although I dont know if they have an specific UVC receptor(which is unlikely as uvc tends to not reach the surface)
Not so very long ago I was wondering why UVC lamps in fridges weren't a thing. This is probably why. I actually read somewhere that UVC lamps have this effect on food but didn't really believe it at the time. I never would have guessed it'd only take 15 minutes for such discoloration to occur. They do make fridges with the violet and blue LEDs though.
For greater tanning contrast and increased process standardization, use a strip of aluminium foil instead of electrical tape. My various rolls of electrical tape have different degrees of opacity to visible light and, I assume, to UVC too.
Probably not UVC as the UVC is stopped completely from usually even thin plastics or rubber. UVC lights need to be made with a special glass too as the glass with also stop it even if extremely thin.
It wouldbe helpful if you gave the name and model of lights being used in testing and even better if you also included a spectro-radio-metric analysis showing mW/c2/s broken out by frequency.
Once again a nice job Clive! I tried this test. It is a nice simple and accessible way that anyone can check their UVC steriliser. My home made steriliser has an 8 watt Mercury vapour tube ( in a foil lined cardboard box). At a distance of 170 mm from the tube it takes 2 hours of exposure to duplicate your result. My rubbish LED corn-cob 'steriliser bulb' did nothing at all to its test Banana! In my view ALL LED UV-C ' steriliser' bulbs are fake unless they cost a significant amount of money! One other point of note: Mercury vapour bulbs naturally generate Ozone 'gas' which produces a typical smell. This stuff is dangerous to lung tissue ( just what we don't want during the Covid-19 emergency!) So if using a cheap tube it is best to make sure there is PLENTY of VENTILATION! More expensive branded tubes are 'doped' to prevent this. Now I feel peckish.....ah..here's a Banana! 😷
I'd like the see the same lights with some fluorescent yellow marker pens, just to see whether there's any UV being emitted by the other two lights at all?
Well done. Thanks to the original producer of this test and thank you for passing it along to your viewers who don't want to get scammed by a cheap Chinese ripoff.
Is your mercury vapor UV-C lamp coated against vacuum UV-C (180nm) . If not, this you may be seeing the effects of ozone generation, which can also organic matter on contact. Sadly, the only way to be sure is one not detecting the ozone odor, but have different certified UV light meters specific UV wavelengths . This will set you back a $1K - $2K if buying it from AliExpress or eBay. I am also just buying the tuned lenses separately to test buying a single wide-spectrum meter and testing tuned lenses against certified meters.
If it's putting out ozone, then it's putting out UVC including the shorter wavelengths. 185nm is Ozone producing. Most Germicidal lamps block that, but Spa sanitizer lamps that produce Ozone do not. www.uvresources.com/blog/the-ultraviolet-germicidal-irradiation-uv-c-wavelength/
I also did the same on my newly delivered UVC lamps to make sure it is indeed UVC. A color changing glasses will also tell you if it's UV. Although I did not test with just a high power normal LED.
Was trying to say something clever in regards to testing that lamp I mentioned previously... Wife then gasps... Says "Shoot! We forgot to buy bananas... Thanks Clive!
I am missing a mention concerning the output (Watts) for each lamp. If the output is different (and I am sure they are) the test becomes misleading. Maybe the fake light would produce some effect if left activated for a longer period. Don't you think?
Cool but scary. Imagine the effect on human banana
It’s not that bad, really. Except for your eyes, UVC isn’t a big concern because it can’t penetrate very deep. However, UVC mercury vapor lamps also emit UVB and create ozone.
@@GRBtutorials Wait, the UVC lamp on the left can't penetrate very deep? Can't that one burn skin?
@@jonnywilson9117 Yes, that one can fry your banana.
@@GRBtutorials _"UVC mercury vapor lamps also emit UVB and create ozone"_
A lot of modern UV-C mercury vapour lamps filter out 185nm with doped glass (I think they use gallium) so no emission line around 185nm, so no Ozone.
Jonny Wilson UVC can’t penetrate skin enough to get to live cells (but it’s still dangerous, especially if you have an open wound). Maybe it can burn the outer layer of dead skin, though. However, UVB can, and they produce a fair amount of it.
I appreciate that after discovering the led lamp was particularly hot Clive touched several more times to make sure
He will from now on use it to heat his chilly home!
Like all tradesmen, his hands are 99% callus at this point.
Real science requires verification.
And was surprised every time!
Wet paint syndrome.
Now that you have a calibrated test platform, how about trying some cheap vs expensive "UV" glasses and goggles to see which really protects your banana.
Everything's going to block it. It's practically impossible NOT to block it unless you're using fused quartz
Epic. Some cheap protective glasses are rubbish, it’s worth spending £50 on the correct wavelength pair. You only have one set of eyes. Though I must admit the glasses I buy are for laser flash protection.
@@rogerhargreaves2272 It is definitely absolutely NOT worth spending $50 dollars on a pair of goggles for UV protecting capability unless you are talking about laser radiation. Literally any $2 pair of polycarbonate goggles will block practically everything below the visible range and are perfectly fine for incoherent common UV source blocking like for germicidal lamps like this. UV laser blocking is more complex, it's worth buying from reputable sources and spending more in that case.
Muonium - I can’t agree with you more on that one. Mine are for use with powerful lasers; so it’s not worth compromising. I get specialist ones shipped from the States.
@@Muonium1 They don't block everything. A simple test is to use a piece of paper marked with a fluorescent marker and then place the glasses or goggles between the lamp and the paper. Even the expensive ones pass a small amount of UV. For lasers, you are correct - it is important to buy the best ones to protect your eyes as even a short flash can be disastrous.
Now combine the hot dog cooker with the banana frying LED lamp.
Or just combine the hot dogger with the banana
...and you've got the Trump and Co Covid repair kit.
crispy inside and out. let's do a steak
Microwave:
Cooks from the inside
Ionizing Radiation & High Current Shunt hotdog cooker:
Plasma cooks from the inside and fries from the outside
Cooked in the middle and crunchy on the outside.
This is probably the most affordable UV lamp test out there, actually.
Now i understand why, when bananas were an expensive rarity in Soviet times, also sold green, you were supposed to put them in dark place for longevity. Previously i thought this was to avoid heat, and not exposure to sunlight.
This technically could also make bananas suitable as a medium for photography using a pinhole camera with sunlight exposure. Or a medium for banana art, in which a stensil is put on a banana and exposed with UV light. Oh, the bananossibilities.
Now I really want to see banana photography....
@@BRUXXUS get ready for veeeeeeery long exposure times
You could print black and white film negatives on a clear film and make a banana skin canvas. Then put the film with the image on top of the banana canvas and expose it to UV light to "develop" the image
A few decades ago I did banana skin photo's using black n white photo negatives, placed over banana skin exposed to a small UVC lamp for 5 to 10 minutes. Got some cracking good photo's though after several shots with the same negative, the negative fades quickly. Was a fun and rewarding little experiment to do.
@@EzeePosseTV sounds fun
Will now be saying “burnt the banana” instead of “sh*t the bed” or “screwed the pooch.”
Count me in.
Tanned the 'nana!
@@reggiep75 Ok, now you just sound like you're -beating- spanking the elderly! lol
Clive, I found the four 5 year olds lurking the channel...
My concern is how hot the fluorescent light may get. It's possible that the heat from the fluorescent light gets warm enough to discolor the skin of the banana.
To isolate this, I'd suggest keeping the lights a few inches off the banana, and use a fan to blow cool air across it, to make sure heat didn't cause it to discolor.
I’m pretty sure banana skin became brown because of the heat. That happens when you heat it up. I’ve tested my UVC light with nana but the distance was much larger and it didn’t turn brown.
Neat idea: I propose heat from the lamp are skewing results. you should retry without direct contact/proximity
I've been looking for a home-made test like this for weeks! thank you!
What really works great to see UVC, is a broken fluorescent light tube, but you need to shine on the phosphor directly without passing through the glass.
I need more detailed instructions on this 🤣
I do encourage your videos as it is a joke how many people are thinking that these DISCO lights are germicidal. Thank you for your information as it is a great help. I know alot about uvc lights as I used to work in a petshop where these lights (uvc lights) where used for getting rid of contaminants in pond water. Thanks to your videos I know more then I did about uvc that it can harm the skin and its benifits against germs. Keep up the good work Clive as u think it is making an impact. Many thanks James ❤️
@Brandon Smith i ment encourage 😂😂 auto correct as usual
@Brandon Smith I have edited the mistake
Discolights aren't germicidal? You mean, I have been goind to the disco all my life for health reasons and it was all a waste?
I think they're all technically "germicidal", but light gets exponentially better at killing as it gets closer to UVA?
It never fails to amaze me you always say things that have never been said in the total existence of mankind "if you mask off a banana"
try looking up the channel "AvE"
We need no longer fear the banana.
This is fantastic, I bought a toothbrush sanitizing light from a retailer in China, and I have always been skeptical if it was actual UVC. Thanks!
I brought one of those for only about £3 on eBay and was also skeptical about it's UVC claim. However, when I put EPROMs directly on top of the mini UV tubes it erased the EPROMs in about 10 to 20 minutes. EPROMs require UVC to be erased so I guess the UVC claim is true.
I just hope the clear plastic clam shell covering the tubes blocks the dangerous C spectrum!
@@slm60uk If they are mercury vapor tubes, they are genuine UVC lamps.
@@slm60uk EPROM can also be erased with 400 nm UV (UV-A). Thus your test does not really show that is a UV-C source (285 nm and below)
@@slm60uk yeah... I've got a crappy ordinary UV-A (maybe B, certainty not C) light for erasing EPROMs.
@@sleeptyper not if they've got a glass, rather than quartz, envelope.... as the glass will block the UVC
Hit em with the old "ionizing radiation!"
Apparently purple disco lights also give you purple fingers!
Thank you for providing us with all these UVC videos. I know it was initially against your better judgement but we kept pressing.
I have the lamp on the left. I read somewhere recently UV-C harms plants. I have an aloe vera plant as well as a few other house plants that have't been well and I couldn't think why, yep I burnt them, they have gotten better since.
Cover with brown bag before using. Also
A UV-C lamp is highly dangerous and not to be used for anything but sterilization/desinfection.
Plants prefer the visible spectrum, ebay has lots of red-violet "grow lights" which are a bit more efficient than white lights because they leave out the green-bluish component.
UV-C damages plants but they should recover if it wasnt too much damage. UV in general is not beneficial for plant growth. Grow lights are what you are looking for.
@@drkastenbrot yes I understand. The plants just happened to be in the same room I was treating. I knew about dogs and cats and I wear the proper glasses to go in and out. There seemed to be a delay in the plants getting injured and I think they may have had a growth spurt at first followed by darkening of the aloe and palm fronds falling off.
i hope you ventilate lol
im glad to hear your plants are ok x
Thanks for posting this! Have you tested true UVA/UVB lights to show the contrast with UVC (not just the fake, purple or NUV lights)?
Thank you for another excellent video, Big Clive. I see that there are several good TH-cam videos now, about fake UVC lamps. Some have tested with proper UVC meters too. Hopefully Amazon and Ebay will stop listing these scam LED lamps.
you should put links on were to buy real uvc lights
I wonder if the germicidal lamp is actually heating that tape on the UVC-irradiated banana, causing the peel to turn brown in the area of the tape covering. Either that or the camera got a bit confused differing green color from yellow background. Still, this test is actually valid. Many UV-C LEDs I have seen (and considering buying) are up to 200 milliwatts which is honestly nothing to write home about, in fact they are dimmer than large Mercury UV-C lamp (which is a bit weird because some powerful UV-A LEDs already outperform the 40 feet blacklight fluorescent lamps - Nichia makes decent blacklight LEDs like NVSU233, alas).
Thanks Clive! I've been wondering how to test some of the supposed UV-C lights I bought for sanitising. UV meters are expensive.
I found my wife's old Pollenex Toothbrush Sanitizer yesterday, complete with a warning label that it uses UV and that eye and skin damage could occur if used with the cover off. It has a GTL3 size bulb and a 20VAC power adapter. I "borrowed" it to erase 80's "windowed" UV EPROMS. She can have it back now ... unless I can figure out how to jam a banana in there.
@ShiDaFu Now you know. If you still have any older devices with them in it, you might want to make sure their labels haven't dried and fallen off. ANY stray light could slowly degrade the programming.
Great to see this confirmed in another video :D
Coincidentally I tried this yesterday with my real UVC booth setup to confirm it was all working, and I am happy to say it is.
I eventually got a refund for my fake ones off eBay, although I did have to resort to eBay stepping in after a mandatory 8 days.
For how much time did you expose the banana to uvc?
@@karmveersingh2249 about an hour and 1ft away. I didn't see the effect until the following day either
thanks for the video. Will the bananna discolor from UVA and UVB or just UVC?
This video is a wonderful public service. I recently got a little UV lamp like the one you included in a previous video, so I trusted it more ... now I dont have to trust it, I can test it. Thank you, and thank you to the viewer who gave you this idea!
banana for scale, very cool
Could you provide a link to a real UVC lamp, please?
Awesome thanks, I noticed that happened to my bananas too, nice to confirm I have a working lamp. This has been the only place if found with concise information on these lights. Most aren’t very clear what they’re talking about and don’t go into the danger at all. 👍
Does anyone have any information on the effect of UVC light on non-green bananas?
Wonder what type lamps are used in tanning beds and would that do the same as the UVC lamp did to the banana. ??
Wondering if this is actually making the fruit ripen more quickly? I like my bananas very ripe ( sweet ). I usually wait till the skin goes mostly blackish but not mushy.
I wonder how they look if they now ripen.
So in these trying times, I'm still working. I have one or two days a week doing retail on top of my regular work. I've been looking for something like a disposable touchscreen stylus so my customers can sign their signature without touching the screen. Best solution so far? Baby carrots. Interested on doing a video about that Clive?
Hey Cive, just how hot does that LED get?
Some phosphors only fluoresce under UV-A. This is why you can’t make old fluorescent tubes glow under UV as the glass tube blocks it. If you were to break the tube, (not a good idea) and present the phosphor coating to the UV-A it will fluoresce if there is a short-wave content. Won’t work for black-light as it is glass filtered.
It would be interesting to repeat this test with a banana that's been coated with sunscreen.
Especially if that sunscreen is able to block UV-C as well as UV-A and UV-B.
That banana didn't burn, he was just shocked by how fake that UVC light is.
"Big Clive puts his banana in a UVC light" might have gotten more views.
It would!
"Big Clive exposes his banana"
Hi there,
Is there any portable uvc sterilizer that you would recommand? Because the one on the video is not easy to carry...
Cheers
Might want to get a little info to add to this test.
What is the wavelength range to kill viruses? And optimum nM.
What is the wavelength that kills viruses but produces ozone which is dangerous?
What are the safe lamps? Or what safety precautions should be taken?
When I did the banana test, it was clear that the sunburned part was the only part getting UV-C disinfecting. So any item to be disinfected would have to have UV reflected(shiny aluminum foil seemed best. Normal mirrors not so much. The glass of mirrors blocks UV BEFORE it reflects off the mirror coating on the back. ) Meaning the UV could reflect onto all sides, or the item rotated for more thorough exposure.
Clive Thank You for all the info that you give us. I ordered one of the Ebay (So called) UVC devices that you had shown. The reason I wanted it was for finding leaks with the dye that you can as to coolant systems in a vehicle. The one I ordered was the black wand style one you showed.
A real UVC won't light up fluorescent paints or posters, they're tuned for UVA. They will light up a CF phosphor though, but the glass envelope of a CF is not supposed to pass UVC out from the mercury vapor inside.
@@TD_YT066 I should of been a little more clear on then being called UVC and not as Clive has said. I ordered it for looking for the leak dyes.
@@seannot-telling9806 You want a 425nm UVA, the short 250-200 nm UVC wont excite the dye. www.r744.com/files/pdf_017.pdf
@@TD_YT066 One of the ones that Clive showed in one of the other videos on this topic is what I got and it makes dye glow very bright. It also works well for cat urine.
Do you recall the long black one he showed some time ago? That is the one I got. Nice for dye locating.
Plants do detect UV light with proteins like UVR8, although that one is for UVB.
So, the banana changed color due to UVC damag e/ damage response on the cells, although I dont know if they have an specific UVC receptor(which is unlikely as uvc tends to not reach the surface)
Not so very long ago I was wondering why UVC lamps in fridges weren't a thing. This is probably why. I actually read somewhere that UVC lamps have this effect on food but didn't really believe it at the time. I never would have guessed it'd only take 15 minutes for such discoloration to occur. They do make fridges with the violet and blue LEDs though.
Is it more soft inside though?
What about UVA/UVB vs UVC?
Is the banana safe to eat now
For greater tanning contrast and increased process standardization, use a strip of aluminium foil instead of electrical tape. My various rolls of electrical tape have different degrees of opacity to visible light and, I assume, to UVC too.
Probably not UVC as the UVC is stopped completely from usually even thin plastics or rubber.
UVC lights need to be made with a special glass too as the glass with also stop it even if extremely thin.
The UV lights seem ok for administering internally. Could the bananas be used the same way to administer potassium internally?
Could you please share the link to the actual UV-C lamp you used in this video? Thanks you so much!
Does this work on all fruits or just bananas i wonder
It wouldbe helpful if you gave the name and model of lights being used in testing and even better if you also included a spectro-radio-metric analysis showing mW/c2/s broken out by frequency.
question, Is it possible to use UV light to kill dandelions in the lawn but, more importantly, did you eat the banana after exposure to UV?
Expected the uv c lamp affect other bananas too.
What was the exposure duration of the radiation?
Can you use the UVC lamp to cook pineapple from the inside?
Is this the same UV range that will discolor plastics?
All UV wavelengths have the potential to cause discoloration over time.
Will black light uva have the same effect to that banana?
Is that mercury lamp on the left an UVC lamp that produces Ozone?. Im curious to know if there was Ozone potentially affecting the banana aswell.
Will there be a difference in the banana ( color ) if the uv light is A,B or C?
What is the wattage of the uvc lamp you used?
"I'm taping my bananna!" Nothing odd about that statement at all. :)
¿Is a chip 3535 an UVC germicide?
Once again a nice job Clive! I tried this test. It is a nice simple and accessible way that anyone can check their UVC steriliser. My home made steriliser has an 8 watt Mercury vapour tube ( in a foil lined cardboard box). At a distance of 170 mm from the tube it takes 2 hours of exposure to duplicate your result. My rubbish LED corn-cob 'steriliser bulb' did nothing at all to its test Banana! In my view ALL LED UV-C ' steriliser' bulbs are fake unless they cost a significant amount of money!
One other point of note: Mercury vapour bulbs naturally generate Ozone 'gas' which produces a typical smell. This stuff is dangerous to lung tissue ( just what we don't want during the Covid-19 emergency!) So if using a cheap tube it is best to make sure there is PLENTY of VENTILATION! More expensive branded tubes are 'doped' to prevent this. Now I feel peckish.....ah..here's a Banana! 😷
but you should LEAVE THE ROOM during this test .....you forgot to warn
them Clive
can you post a link to the UVC bulb you're using? thank you.
I'd like the see the same lights with some fluorescent yellow marker pens, just to see whether there's any UV being emitted by the other two lights at all?
Blue light will make those glow.
Im curious to see what it looks like under the skin, peeling the skin back, as UVC goes through most things doesn't it ?
Where din you buy the real uvc? Link please 😊
You can tell which one is the real UVC lamp in the first frame, only one of the lamps has yellowed plastic parts
I hope you've got a UV filter for your camera; I'd be worried about damaging the camera with these UV lamps
Why would UV damage the camera?
One potential issue doing that: you can't see with your eyes if the tape is transparent or opaque to UV.
UVC is usually less penetrating of water, glass etc. Xray, Microwave and radio are more penetrating, but for different reasons.
Well done. Thanks to the original producer of this test and thank you for passing it along to your viewers who don't want to get scammed by a cheap Chinese ripoff.
But does the banana have to be green? Will it work with yellow ones?
I can't imagine how I WON'T be using this info every day from now on!
Is there a UVC LED type that would disinfect about 10" away from the lights instead of so close?
Where do you get the real uvc lights
Does the UV-C make it through the banana peel? What does the inside of the banana look like?
It barely penetrates into the peel at all. None of it passes through the peel. The fruit inside is unaffected.
Does the banana have to be green?
Why are your fingertips purple?
Is your mercury vapor UV-C lamp coated against vacuum UV-C (180nm) . If not, this you may be seeing the effects of ozone generation, which can also organic matter on contact. Sadly, the only way to be sure is one not detecting the ozone odor, but have different certified UV light meters specific UV wavelengths . This will set you back a $1K - $2K if buying it from AliExpress or eBay. I am also just buying the tuned lenses separately to test buying a single wide-spectrum meter and testing tuned lenses against certified meters.
Could it be the ozone rather than the UVC? I think you have to eliminate that possibility before concluding.
If it's putting out ozone, then it's putting out UVC including the shorter wavelengths. 185nm is Ozone producing. Most Germicidal lamps block that, but Spa sanitizer lamps that produce Ozone do not. www.uvresources.com/blog/the-ultraviolet-germicidal-irradiation-uv-c-wavelength/
You might be able to use minerals that only fluoresce under shortwave light such as franklinite, calcite or willemite.
Mary: "but it's purple"
Big Clive: "Mary, my banana"
Chowder: It's not blue?!
thank you saw other video and tried but was not sure of time to put lite on the banana to test my lite. this clears that up for me and others am sure.
Does it have to be a green banana?
I also did the same on my newly delivered UVC lamps to make sure it is indeed UVC. A color changing glasses will also tell you if it's UV. Although I did not test with just a high power normal LED.
Would these stop mold growth in the bathroom?
Ventilation is one of the best things for that.
Was trying to say something clever in regards to testing that lamp I mentioned previously...
Wife then gasps... Says "Shoot! We forgot to buy bananas...
Thanks Clive!
Why didn’t you peel the bananas afterwards?
Another great, and instructive video! I find your presentation soothing after a hard day! Greetings from Chicago!
Try the banana test with real UV-C and some factor 50 sun-block cream to see if it blocks it?
where to get a good real uvc bulb in the uk?
where can I buy Banana Tape ???
I thought you'd drawn a smiley face on that 🍌.
Or a "graphic" from the tattoo machine video
It really did look like a panda tattoo 🐼
Where is the link in the description you promised, Clive?
Hi thanks for making this video. Does uv test card works?
Just a heads up to anybody who wants to sanitize with UV-c. It didn't just damage your eyes and skin, they fade dyes and break down plastic too
Your test is flawed -- why didn't you put dividers between the 3 different lights. Cross exposure.
I am missing a mention concerning the output (Watts) for each lamp. If the output is different (and I am sure they are) the test becomes misleading. Maybe the fake light would produce some effect if left activated for a longer period. Don't you think?