UVC. The green banana test.
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- Опубликовано: 12 май 2020
- This experiment was inspired by another video where someone discovered that bananas changed colour while being irradiated with UVC light.
Here's the video that inspired this test:-
• A hint that your uvc l...
I thought I'd do a test on some bananas with a variety of fake and real UVC lights.
This test was more of an LED versus real UVC test. I'm not sure what the precise scientific spectral response of bananas is.
Note that the camera was not damaged by the UVC light, as it has a glass lens that blocks the most destructive wavelengths.
The LEDs definitely burned the banana with heat and not UVC energy. The LEDs are being run very hard for visual effect.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
www.bigclive.com/coffee.htm
This also keeps the channel independent of RUclips's advertising algorithms allowing it to be a bit more dangerous and naughty. 
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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 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.
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.
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...
I've been looking for a home-made test like this for weeks! thank you!
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"
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 🤣
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!
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.
Excellent demonstration, Clive. Thank you!
Another great, and instructive video! I find your presentation soothing after a hard day! Greetings from Chicago!
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)?
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?
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.
Thanks Clive! I've been wondering how to test some of the supposed UV-C lights I bought for sanitising. UV meters are expensive.
Clive, do you know of any way to reproduce the eerie color / glow of the UVC lamp without actual dangerous UVC? Regular blacklights don't seem to cut it, so i'm guessing there is some visible frequency component those things generate that regular blacklights don't.
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.
Thank you for another excellent video, Big Clive. I see that there are several good RUclips 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.
Because of what I like to watch I've come across this channel quite a few times over the past couple years. Honestly, the nice mellow voice is just a bit to slow for me. BUT because of that I feel like mentioning something about the recent interest in UVC lamps has been fun. There's some extra excitement in the air there or something lol
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
Good and cheap testing tools (without smelling or inhaling the ozone). Thanks !
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.
Excellent as always Clive
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. 👍
Thanks, I’ve been using a uv-c bulb to sanitize groceries and had wondered why the bananas had that odd brown hue, now I know!
Neat idea: I propose heat from the lamp are skewing results. you should retry without direct contact/proximity
@Bigclive, just curious. Would a 365nm UV-A lamp have the same effect as the UV-C lamp?
Hi there,
Is there any portable uvc sterilizer that you would recommand? Because the one on the video is not easy to carry...
Cheers
Hit em with the old "ionizing radiation!"
Thank you so much for this information. You are incredible, man!
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.
thanks for the video. Will the bananna discolor from UVA and UVB or just UVC?
We need no longer fear the banana.
I have four of these coming in the mail, so thank you, I will give this a shot when they arrived! Thanks so much, this is pretty important!
Four bananas or four UV lamps? :-)
Tenetri still no reply, the world needs to know. Thanks so much, this is pretty important!
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!
Clive, which of these 3 will darken your glasses? I use my glasses to find out, and UVC does not darken it, where UVB does. Or I think it is (they darken out in the sun any way). Could you try yours?
Bravo! Kudos! Applause! Magnificent low tech easy test!
Could you please share the link to the actual UV-C lamp you used in this video? Thanks you so much!
and which uv lamp do you recommend? any brand? power? or with what parameters can I find it to be original?
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
Will this test work with the likes of Big Brute UVC Sterilizers? I've tried but doesn't seem to have an effect on the green banana. :(
I can't imagine how I WON'T be using this info every day from now on!
I have 36w, and sleep room 4x3x2
what's the optimum time to sterilization?
if there is water gallon 19L there, will it not effect the water?
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
Wonder what type lamps are used in tanning beds and would that do the same as the UVC lamp did to the banana. ??
@bigclivedotcom So, I tried something at home but I don't have the stones to mess around with it too much. I tried putting a CFL bulb into an ultrasonic bath (just the glass part) and it did knock off a lot of the phosphor and leave gaps of bare glass. I'm wondering if that method of getting ahold of easy UV bulbs is of interest to you? The bulb continued to work afterwards, but I stopped testing there because I like having eyes.
Is there a UVC LED type that would disinfect about 10" away from the lights instead of so close?
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! 😷
Cheap UV sensors sold out since last video. Now Clive makes banana shares skyrocket XD Great video!!
Clive! Genius demonstration. This should help the naysayers understand. It is so hard to crack a coconut, but it can be done, with enough moxie.
Interesting. You live and learn. Good one Clive.
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.
I'd love to see this test with some of your smaller UVC lights!
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.
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.
Does anyone have any information on the effect of UVC light on non-green bananas?
Mary: "but it's purple"
Big Clive: "Mary, my banana"
Chowder: It's not blue?!
I appreciate these videos. One of my co workers left one of those led things on at work and I don't know if I should get mad or laugh at them because they got scammed
Fabulous! Such a beautiful experiment, very like the stuff that Darwin used to as I mentioned before for another of your videos. Thanks for sharing!
How many watts of UVC light should I putin a 12 inch by 24 inch box? Thanks!
Beautiful test, thank you so much
can you post a link to the UVC bulb you're using? thank you.
Expected the uv c lamp affect other bananas too.
"Big Clive puts his banana in a UVC light" might have gotten more views.
It would!
"Big Clive exposes his banana"
Great video, getting hold of UVC LEDs is very hit & miss.
I’m going to do it! I have a similar UVC 🤜🏼⚡️🤛🏻 I ❤️ your videos!
this is great test for uvc light to verify which light is real uvc. thanks
Hi clive a huge fan of your channel!, one question can you test varios types of plastic to UVC exposure?, what happens if leave your lamp dissinfecting your spaces and you have some appliances nearby?? will they yellow or crack?, thanks a lot and keep up the good work giving us true answers!
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 did you buyed the UVC light? I want one! Good vid!
So, are the LED UV lamps good enough for something else, like showing fluorescence (better than the "fake" purple CFL bulbs) ?
And can they be used without any problems related to UV-A or UV-B ? (probably the light blue one emmits a fair amount of UV-A)
The deep violet disco style lights are mainly for visual effect as they make fluorescent materials glow.
Have you tried this with full spectrum led lights that can substitute for grow lights in greenhouses during winter months.
I have ordered 2 of each 10 watt and 20 watt full spectrum lights for my strawberries to try and get year round strawberries. They are 220v AC with inbuilt drivers and I am thinking of using just the 2 X 10 watt lights on a daylight timer because I have them in front of the window at the back of the house and try only get the morning light and tend to grow toward the window which wastes a lot of grow area. Hopefully I can balance this out and get a better production. Wanting to also automate the watering also.
Will there be a difference in the banana ( color ) if the uv light is A,B or C?
I hit this video at 634 views, and it had 320 likes - that's rather impressive. Good on you!
Very effective experiment!
What is the wattage of the uvc lamp you used?
black forest ham responds to UVC even faster than your banana did.
Hi thanks for making this video. Does uv test card works?
Thanks for the useful and much needed info
Can you cover the insect killing type UV? I've seen one in action and it attracted even big insects just like magnets but it might've been due to a very high voltage mesh in front of the uv lamp. Could you explain it?
Thank you! You just saved me an enormous hassle!!
"It burned the banana" I laughed way to hard at that!
Where is the link in the description you promised, Clive?
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?
"I'm taping my bananna!" Nothing odd about that statement at all. :)
banana for scale, very cool
Will black light uva have the same effect to that 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.
you should put links on were to buy real uvc lights
Hey Cive, just how hot does that LED get?
Heheh, Taking Big Clive OUT of Context #002 - "...Oh, That'is a very Hot Lamp! That is an EXTREMELY HOT LAMP! ! It's BURNT the BANANA!" lol
The UV lights seem ok for administering internally. Could the bananas be used the same way to administer potassium internally?
I wonder how they look if they now ripen.
Does UVA and UVB brown green bananas? Can you do video on all 3 uv light on banana for the average UVC light consumer? Thanx
Thank you very much for this update bud . I have been thinking about getting 2 for my shops through the night (till area maybe kitchen as well).but have been put off but the flooded fake market, now I can test to see quickly and easily and be safe in the knowledge that it’s doing a very important job specifically bought for. Again thank you. I will share this with our Chamber of Commerce if that is ok with you?.you don’t need to write a big response just like this if ok. If not don’t like it. Cheers.
Hi Clive, love your videos and have been a fan for years, but, never commented. I’ve bought a UVC mercury lamp (a proper one) and am starting to do my own RUclips videos with various science experiments.
One I was considering was to show the power of these lamps and I’d like your opinion on the scientific method. My idea is to get a solution of yeast, sugar and water, mix, then split into two. One will be left as a control, the other will be placed in a light proof box with the UVC lamp for 30 mins or so and then both will be compared after a couple of hours. Any thoughts? Do you think the UVC lamp will kill the yeast?
It should, but I'm not sure how far the UVC will penetrate the liquid it should have a surface effect though.
bigclivedotcom - didn’t think of that. Maybe I’ll need to stir every few minutes to see a result. Really appreciate the reply, thank you 👍
We are firmly in the UVC era. I admit I kinda miss the bygone times of explosion containment pie dishes and vape teardowns :) BTW an interesting vape pod to tear down is the suroin edge, it has a replaceable battery that's just very satisfying to play with ^^
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.