Handheld DNA eraser?!?

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This handheld device is meant to emit UVC. But does it really? I will test it using a green banana and a spectrometer. I will also look into how UVC is reflected by different surfaces. Is a mirror the best UVC reflector?
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#UVC #Banana #Brainiac75

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27 авг 2022

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Комментарии : 704

@davidhenderson3400 Год назад

UVC and a banana? Well that explains something that happened in a welding shop I worked at along time ago. This one man that worked there always brought bananas to works. One day he just laid it and his lunch on top of the stick welder where he was working. About lunch time I heard him upset. We all knew welding generates UV but knew nothing about its effects on bananas. The side facing his work area was as black as night. We all guessed UV had caused it but was unsure. The next day he saved the peel from his banana and hung it up by where he was working and sure enough it turned dark. I knew nothing about UVC (or UVA or UVB at the time. I though all UV was the same). Now I have an answer to a 30 year old question. Thank you.

@guerrillaradio9953 Год назад

Yup! This is why just closing your eyes doing tack welds can still give you flash (if you do enough of them) because the worst of it can still pass through your eyelids. Not to mention it can give you skin cancer, especially on your face and hands. I still do it, but.... lol. I only weld occasionally for a hobby, so it's probably no big deal.

@VideoGameBoxReviews Год назад

Good to know if I ever urgently need som dark banana peels

@tacticalbacon9877 Год назад

@@guerrillaradio9953 get a welding helmet bro. PPE is always worth not being free

@egaag Год назад

@ThatChemist

@TheRealRusDaddy Год назад

Im sure the guy who had the bananas still sits up at night wondering why

@ItsAMeAndrew Год назад

3:16 no such “more scientific instrument” exists in comparison to the all mighty banana

@JustPyroYT Год назад

😂

@volvo09 Год назад

he's still learning, be easy on him... it takes a while to get down to measurements so precise you need to bust out a banana.

@brainiac75 Год назад

It sure is a versatile fruit. I detect its radioactivity in this video :D : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-OLdDKb9Bago.html

@kamipls6790 Год назад

Damn that was my thought as well and then I spotted your comment 🙈

@Muonium1 Год назад

@@brainiac75 reposting my earlier top level comment here because it was autodeleted by youtube's Artificial Imbecility algorithm, presumably for having the words "banana" and "exposed" in the same sentence: You have to wait a little while after exposing the banana for it to "develop". Usually a couple hours or so will reveal the line at the tape edge. The 400nm LEDs in these products seem scammy, but they actually do serve an important purpose by being in the same package as the AlN UVC diode they function as a visible and obvious safety warning that ionizing radiation is present. There actually are true 255nm UVC flashlights now, but they're bespoke, extremely rare, and very expensive with usually short LED lifetimes. You can see them demonstrated on here at Raymond Wu's channel and by searching for "255nm flashlight". Practically EVERYTHING is fluorescent at 255nm, especially when cryogenically cooled.

@matiastripaldi406 Год назад

Fun fact! As you saw experimentally, most materials transparent to visible light block UVC, like regular glass or plastic. This is why when doing protein or nucleic acid spectroscopy in the lab, wich requires 260-280nm light we use veeery expensive quartz glass containers :) And if you've ever been near a spectrometer you usually get that "this cuvette is worth more than my life" feeling

@BH4x0r Год назад

same way that UV-C tubes are always made out of quartz-glass as normal glass would block it

@filonin2 Год назад

A quartz banger for doing dabs is like $30 so it can't be that expensive.

@BH4x0r Год назад

@@filonin2 it doesn't need to be as perfectly clear or as thin as in UV tubes, the tolerances make it more expensive to produce

@chir0pter Год назад

@E Van maybe a couple hundred bucks, enough that if you are a lowly undergrad working in a research lab trying to stay out of people's way you feel horrible for wasting grant money by breaking one

@WitchMedusa Год назад

Same thing for coal miners in third world countries

@EzeePosseTV Год назад

place a small Negative from a black and white photo against the skin of a banana firmly. Zap the Negative with a strong UVC lamp (use safety precautions) until the skin turns brown. Remove the photo negative and if you did it correctly, you should have a clear photo developed on the banana skin. Did this experiment 30 years ago (in my mid teens) with excellent results. Was strange seeing my photo etched on a banana, lol.

@MattyEngland Год назад

Sounds cool

@EzeePosseTV Год назад

@@MattyEngland Yeah! The amount of detail on the banana-pic always blew my mind though it took a bit of practice to get the negative to lay flat against the skin, more negative in contact with skin = more detail. Colour negatives didn't turn out that great but was an unusual effect left on the skin. I remember joking about becoming a Millionaire selling photo's on bananas, haha ... Yeah the innuendo's got ridiculous, it was quite funny.

@MattyEngland Год назад

@@EzeePosseTV lol, yeah I've seen people write their names on bananas by masking them, but I like the photo idea.

@teresashinkansen9402 Год назад

Hard to believe. UVC does not go thorough film. If what you did is true must been some other wavelenght maybe even blue light.

@torydavis10 Год назад

I mean, the obvious choice here is jesus

@tuopeeks Год назад

The banana skin test works quite well but does need quite a long exposure. The LED output is tiny compared to mercury lamps. If you use a bit of glass from a broken fluorescent tube still coated, it will glow dimly when directly exposed to UVC but blocked completely by the glass when turned over. The dim glow gives an indication of the low UVC output compared to the internal emission of an operational fluorescent tube.

@strenter Год назад

The banana getting brown from the UVC lamp should have nearly nothing have to do with the heat the lamp is emitting. Heat surely is not blocked much by insulation tape, therefore it should be the UV part. There are materials that selectively let only a small band of frquencys transmit through them. It could be interesting to use several of a certain thickness to compare in spectrum, starting with IR diodes over different colors up to UVC diodes in a protecttive housing to both eleminate external light influence as well as to protect yourself.

@Itsa_me_MC Год назад

Was going to comment this same thing, but also it will accelerate the browning. Even if the change isn't immediate you might notice it after a couple of days.

@timteecvhn Год назад

Honestly, it's a bit surprising that they aren't actually wrong about the emission of UVC, but they aren't quite right on it being as powerful as they'd claim it to be most likely. Either way pretty cool. Also the banana test deserves some more experimentation I believe. Because I wonder if plopping that small UVC bulb up against the banana would do the same thing as it's larger "dual" tube brother. (i say dual mostly because it technically is two tubes, but they are connected together close to the tips so... yeh.)

@tyttuut Год назад

I have a similarly sized UV LED and it only puts out 2mW.

@torydavis10 Год назад

They're not wrong, they're lying. Half of the leds make uvc, the other half make a comforting blue glow, clearly by design. Yet, the box claims the total output as uvc.

@yuxuanhuang3523 Год назад

We had some UV LED lights at home and they emit both UVA and UVC just to keep us from thinking they are broken. I guess UVC diodes are really expensive, even a small UVC light will cost much more than a powerful UVA flashlight. That's why they used ones that gave off more UVA I guess.

@Joe3D Год назад

There are lots of scams out there.

@YounesLayachi Год назад

Marketing in a nutshell

@StephenGillie Год назад

"Ultraviolet light is absorbed by a double bond in thymine and cytosine bases in DNA. This added energy opens up the bond and allows it to react with a neighboring base. If the neighbor is another thymine or cytosine base, it can form a covalent bond between the two bases." - PDB-101

@CTCTraining1 Год назад

Might be worth checking with the International Standards Institute to see if you can borrow their reference banana - for calibration purposes of course.

@ThePeacePlant Год назад

Doubt they would let him use it

@thunderedwards1513 Год назад

😆 "ahh ya, I got this banana tanning issue" But seriously I wonder if GMO banana results vary

@insu_na Год назад

Makes me happy that you're clearly surprised by some of the results. This really shows that you aren't making a video with a conclusion in mind and cutting towards that, instead you go in open minded. Pretty cool!

@sulfie46 Год назад

A handheld UV Sterlizer? I've seen them in water filters but never for external use. Loved the scientific banana!

@lucky43113 Год назад

Walmart sells these they are common and cheap

@disconductorder Год назад

but does it work well with removing your DNA evidence?

@YounesLayachi Год назад

Banana for scale !

@maskettaman1488 Год назад

@@YounesLayachi cringe

@Jeff-jr4xw Год назад

they became popular when everyone wanted to sterilize their groceries after returning from the store

@wolpumba4099 Год назад

3:09 I doubt the black tape blocks the heat of the tube. Therefore if heat darkens the banana the banana should be brown under the tape as well. I believe your banana test. One thing you could try is to place your polycarbonate face shield between banana and source to differentiate the effects of UVA and uvc.

@volvo09 Год назад

yes, the even-ness of the darkening lends me to believe it's truly the uvc interacting with the banana. I've turned on a smaller uvc lamp on my hand for roughly 5 seconds and I could smell the degradation of my skin... it's powerful stuff, so i think the banana took it pretty well, I'd hate to see what that amount of time would do to bare skin.

@samuelfellows6923 Год назад

= sunburn ✅

@Quickened1 Год назад

Electrical tape is very insulative against heat...

@superdau Год назад

The tape might not block heat, but it will block air. But maybe for the banana to go brown it needs oxygen (or ozone as mentioned in another comment)? I'm not claiming that it does, but the tape changes too many "variables", which isn't good in science.

@planefan082 Год назад

@@volvo09 Why would you do that to your skin?! Instant aging

@ooddrr99hh Год назад

It's interesting seeing uv-c mentioned finally! It can be produced when arc welding and so many people I know are misinformed and just put Sunscreen on. I'd love another video that's more in depth on uv-c!

@boneappletee6416 Год назад

It's definitely worthy of more investigations and content, as we all take it for granted as the ozone layer protects us from having to worry about natural exposure.

@samuels1123 5 месяцев назад

I'm curious about how much an arc furnace might splash around in its area when activating probably not the most hazardous part of the arc furnace, but it is something to consider

@-sturmfalke- Год назад

I love how you pronounce "banana". You channel is very serious and informative, and this video is no exception. Keep on educating!

@boneappletee6416 Год назад

This was fascinating, thank you! I found the part regarding the Fraunhofer lines to be especially interesting. I remember in high school science classes being taught about how the ozone layer is important, and so on, but seeing the actual spectral absorption lines and dips in the UVC, UVB and UVA sections really puts it into perspective. Great video, thank you! Just found your channel and subscribed :)

@bubba99009 Год назад

The fact that glass absorbs uvc so well is why manufscturers can't use an ordinary glass envelope on a uvc bulb.

@2MeterLP Год назад

Another test I would have liked to see is how well it actually disinfects. Maybe with a couple of petri dishes, one control and a couple for different lengths of exposure.

@bestaround3323 Год назад

That would be an interesting test

@pbjandahighfive Год назад

Ironically, speaking of DNA damage and also sunscreen... Lots of sunscreen itself actually contains DNA damaging chemicals. You should research it a bit as many common chemicals used in sunscreen can be quite damaging to the person using it. Not all of them, but quite an uncomfortable amount of them. I personally only use Zinc/Titanium sunscreens with minimal extraneous ingredients.

@DiamanteInfernalis Год назад

I agree with this. I've researched several common chemicals in regular sunscreen. A bunch of them are actually carcinogenic and some are (by themselves) labeled as such by the fda, yet none of these things are told to the public that they carcinogenic in sunscreen....as it bakes into your skin by the sun. There are ways to make healthier, and more effective sunscreen, but mostly because of laziness most people just don't. They don't research the chemicals nor do they research ways to do it better than what's sold. It's not actually that difficult. A simple Google search and you have answers.

@bestaround3323 Год назад

What are some of the specific chemicals Edit: damn, got to be honest with you, I was somewhat skeptical at first that your source was an alternative medicine pedaler or something. However, the fact that the FDA has been trying to get tests from the companies for 20 years, and there have been almost zero regulation is crazy. Oxybenzone, seems like it is pretty scary. Along with the others it is pretty ironic that it can cause skin cancer.

@pbjandahighfive Год назад

@@bestaround3323 I understand the skepticism, but I wish I was just a "Mom on Facebook selling essential oils" when it comes to this. There are a number of different chemicals in sunscreen that causes issues where the studies for them literally cite "DNA damage" as a core problem. Some of the common chemicals that are used include oxybenzone, methylparaben and ethylhexyl methoxycinnamate, all of which are genotoxic, but there are still others as well. As stated before, I do still use sunscreen, but stick with Zinc/Titanium composites as they are still effective, but lack the complications associated with common sunscreens; the only issue that I know of when it comes to them is that they tend to be a bit more expensive.

@wolpumba4099 Год назад

You mention that the UVC peak of your spectrum analyzer is smaller than the UVA peak. Likely your optical fiber absorbs more of the UVC radiation or the sensor inside the spectrometer might be less sensitive. Evidently you have some sensitivity otherwise you wouldn't see any signal from the UVC tube. I don't know how you could test it better. Maybe using some very hot black body and fitting a Planck curve to the spectrum. I really like the experiments!

@calabrais Год назад

Seems like a pretty expensive setup he has, I'm assuming it's calibrated for that.

@r0cketplumber Год назад

I wonder if the banana reaction is actually due to an ozone chemical reaction, and not the UVC itself. Mercury UV lamps are available with and without ozone production since the 253nm emission does not create UV, while the 185nm line does, and only escapes the lamp if the envelope's material is designed to pass it. If your lamp makes the telltale smell, the banana browning may be from ozone. I have two UV lamps for my home's A/C air handler- one ozone-free for continuous sterilization of the air, and one that generates ozone for occasional use on a timer while not at home. The ozone system is great for killing vermin that gets into the house, one of the drawbacks of living in Florida's rather _robust_ ecosystem.

@lladerat Год назад

Oh man, those dips on the graph of the light from the Sun were so cool, i didn't even know you can spot them so easily at home, you got some nice instruments.

@XAMEREN Год назад

He came back the moment the world needed him the most

@Flumphinator Год назад

600 megawatts in a handheld device is honestly pretty impressive though.

@Reth_Hard Год назад

Yes, UV is very dangerous, we need special protective glasses when looking at this. This guy is putting all the viewers in danger with his video... Everybody should report this video!

@zentuckyfriedckn2587 Год назад

@@Reth_Hard The whole point of the video is that UVC is dangerous and mitigating that risk?

@prla5400 Год назад

shit this thing can power a city

@nullbeyondo Год назад

@@prla5400 for a nanosecond

@TheDBZ_KING7_Official Год назад

@@zentuckyfriedckn2587 It was a joke.

@fireandcopper Год назад

When I weld, I wonder how much ozone is made from the arc and how much is made from the cursed rays, surprisingly my welding helmet doesn't show any signs of wearing from the rays. I made the mistake of welding once without long sleeves for an hour and I got a sunburn from welding

@Laralinda Год назад

This is again a great video! Here is another suggestion: I always wonder if there is enough UV B light for vitamin D production. As a rule of thumb, if your shadow is shorter than yourself, there is enough UV B light. But is it? How about shadows? And what about "bird lamps" - for pet birds and reptiles you need these special lamps so that the pets can produce vitamin D. The manufacturers always say that the lamps get weaker after some time and won't emit UV B anymore so you have to replace them although they still seem to work. I wonder if there is any cheap "banana test" for this - maybe UV-sensitive colours? But which? I have seen beads that change their colour in sunlight, but this doesn't seem to be selective for UV-B light.

@XANApwns Год назад

Wow, is it just me or has your patron base doubled? Super happy to see that so many others have seen the high quality content you produce and are willing to help further it!

@CoolAsFreya Год назад

I love that you left the banana test experimentation in the video, even though it didn't yield the result you wanted. It's as important to publish negative results as it is positive ones!

@donixion4368 Год назад

Bring on the UV-C! My DNA is already messed up!

@izzieb Год назад

Same. My body is ready for it!

@volvo09 Год назад

I want to smell my flesh degrade!

@Honeypot-x9s Год назад

Exactly, maybe this will jumble it back the right way around for ya know! LETS GO

@monsterupdatewhen Год назад

Hell yeah, so true! *+Melting* ...Well shit.

@maximilianomoyano9748 Год назад

Dude, I love your videos. Thanks for uploading

@StormyHotwolf88 Год назад

WoW! That was super interesting! Especially the dip in the sky light spectrum! I never heard of UVC but I think I am grateful that the ozone protects us from it!

@TheWtfnonamez Год назад

Excellent Banana Test. I have used this test on the strip bulb I use for my phone steriliser. If you have a real UVC bulb it will literally start giving the banana sunburn after an hour. Its also worth noting that you can usually smell a little ozone if your bulb is really working hard.

@johncoops6897 Год назад

Phone steriliser ROFL WOT? That's a seriously silly woo-woo device! Ozone and UV-C are two completely different things.

@TheWtfnonamez Год назад

@@johncoops6897 I have lung disease so Covid means an almost guaranteed trip to ICU. So yes I wear a mask and sterilise my things when I get home. As for UVC and ozone, well Im not a scientist, but I know a lot of people claim that UVC lamps do not produce ozone. That said, I am quietly confident that my UVC strip bulbs that are very cheap, come from China and are intended for terrariums, produce light outside of the strict UVC spectrum. This said, you can smell it brother. When you run something under that lamp for 30 minutes you can literally smell the ozone. The best way I can describe it is that "it smells like something you never smelt before, it smells unnatural, not unpleasant, but you dont fancy breathing it in". I appreciate why you might think my comment sounded funny but really its what I do and I know about it. Peace

@BRUXXUS Год назад

Oh wow, that thing is actually using those special UVC LEDs. Interesting how they use the dual LED packages. Guessing as a way to easily tell it’s on since we can’t see UVC.

@Adreitz7 Год назад

Exactly. Most ordinary people would reasonably doubt the device’s functionality if it only emitted invisible light. UV lights can also be misleading about their intensity (until you find something fluorescent).

@davelowets Год назад

@@Adreitz7 UVC doesn't generally make colors Flouresce.

@Adreitz7 Год назад

@@davelowets Yes it does. The majority of fluorescent minerals ONLY react to shortwave UV (UVC).

@davelowets Год назад

@@Adreitz7 Colors..

@nicholuassommer2084 3 месяца назад

Just subbed. Thank you for existing. Your thirst for analytical digging based in pure curiosity brings me joy.

@MispelledOnPurpose 4 месяца назад

I like the subtle suspenseful background music during the banana test. 😃

@sherrymaloner8843 Год назад

A video from you? A highlight of my day!

@NibbsGaming Год назад

I think the banana test should be used to test everything. Maybe it could even become the new standard.

@irrnfhdns9svjwjw269 Год назад

Don't worry reddit has been using bananas for years

@ronsku57 Год назад

Came right away here when got that notification!

@brainiac75 Год назад

Very quick indeed, Ronsku. Thanks!

@lasagnahog7695 Год назад

I love that not only did you try to use a banana before the spectrometer you left in that it didn't work. Great video as always, the info about the Fraunhofer lines was particularly interesting.

@Sevenigma777 Год назад

This test is straight up bananas! ☺️

@BH4x0r Год назад

what's next, a handheld xray machine? 😂

@brainiac75 Год назад

Sure, look into XRF scanners/spectrometers ;) I think you need a license for them though (and a lot of money....). Thanks for the early watch!

@BH4x0r Год назад

@@brainiac75 yeah knew those existed to check what materials are into something, but i meant for the channel :D

@no-man_baugh Год назад

The fact that UVC can ruin your DNA sounds like such a meme and deserves to be a meme. an A+ threat

@rompevuevitos222 Год назад

I laughed hard when i saw the title

@technoman9000 Год назад

Great video, thanks for making it.

@photonik-luminescence Год назад

Great Video. As always good quality content. The thing is, as a light bulb collector i have some normal PL fluorescent lamps. And yes the do get so hot that you cant touch. But id does not seem to radiate infrared light. The UVC light (PL one) seems to be built like a normal PL lamp. So it might be the strong UVC from the lamp.

@xXx_uraniumvr_xXx Год назад

Love your videos

@RoboArc 6 месяцев назад

I like how you vslidated your test results 🙃 this was a cool video

@B0BBYL33J0RD4N Год назад

Maybe the banana method works with bananas of different ripeness. Might buy a dozen bunches of bananas of varying greenness, then you can do a test grid with stuff like temperature (refrigerate bananas, hot water bath, etc) It might be that a slightly warmed banana that is only barely green works 100x better than a cold super green one. Or maybe the opposite. Lastly, you could make something to focus the emissions into a smaller area instead of wide dispersal . Maybe just an aluminum sheet bent over to make a big U shape. Cause with that light, it could be that it produces enough light to scar the banana, but with such a wide dispersal pattern it only hits any 1 spot at a tiny % of its output.

@JohnnyX50 Год назад

I love the light spectrothingamy :D Really fascinating :) x When you did the sky it kind of proved what I read somewhere that if our brains didn't make sense of our colour perception the world around us would look much more violet than what we perceive?? I use an Ozone generator for sterilising the air in my home. Not that I need to really. It does leave a weird "I can smell everything" after it has gone. Like my wooden stairs really stand out afterwards and fabrics all smell of themselves. That is until the air becomes a mix of everything again after a few days. The generator is quite strong so it's not on for very long or you get that bleachy eye watering smell in the air. Not good for the lungs I'm told. People really shouldn't become to dependant on 'sterilising' everything, that is what we have an immune system for!

@AceFuzzLord Год назад

I love how versatile of a fruit a banana can be in scientific experiments

@centurybug Год назад

Interesting that there's so little UV-C light in nature.. makes me wonder what a camera that could only pick up that wavelength would see!

@XiaoYueMao Год назад

not much, unless theres lightning recently, flashes of plasma such as lighting or arc welding will burn the air creating UVC as well as other UVs, the Ozone layer doesnt absorb UVC produced on the surface, it only blocks what comes from space

@peternoone7902 Год назад

OMG. One of the first channels on youtube I came accross in years that actually teaches only, and which is interesting. What a fresh suprise

@ImmortalAbsol Год назад

Isn't visible light used as a safety feature so you can immediately see when it's on?

@psirvent8 7 месяцев назад

Actually it is.

@siguie2355 Год назад

The banana test works but it takes a few days. Back when covid was a thing I used to hit my groceries with my death ray {25W UVC + O3} and the bananas showed brown in a day or two going dark brown within a week. Great videos!

@cancan-wq9un Год назад

I got the same death ray for groceries too, first thing I did was testing it on a banana. :)

@tuomoauer Год назад

I also used a death chamber for covid. Old aquarium inside layered with aluminum foil and two 30W UVC tubes. Groceries were on a chicken fence grid some 10 cm from the aquarium bottom and some 30 cm from the tubes. After some 30 min exposure bananas were turned brown and within few days totally black. For oranges no visible effect. The aquarium was placed outside not to exposure myself. Great to find out there are other disinfection freaks also :)

@JustPyroYT Год назад

Great Video! 👍 I always get excited when I get the notification^^

@brainiac75 Год назад

Thanks, always exciting to finally release a video after days and days of work.... More to come, and thanks for the early watch and comment!

@hazelhazelton1346 Год назад

This channel teaches me stuff I didn't know that I wanted to know. ^.^

@GraceSerenityK Год назад

If you wrap the banana in foil and retest the exposure to the lamp, that should prove if the heat or the UV was what browned the banana

@PavelSkollSuk Месяц назад

I did not know about the banana test. Great way how to test it.

@elivaughan1192 Год назад

lmao at the "something more scientific than a banana" good stuff

@zachcrawford5 Год назад

I didn't know there where actually UVC LEDs. I've seen them advertised but only conveniently after the pandemic started so I thought they were a scam. Now I wonder what the shortest wavelengths that can currently be emitted by LEDs is. Are there X-ray emitting diodes yet?

@chri-k Год назад

there are not

@grosserboss Год назад

They were available before the pandemic, but were not so widely used ... more in a niche market because of the low output power and high price. The shortest wavelength they reach so far is 230 nm. Outputpower of 100 mW per LED are avaible today.

@petersmythe6462 Год назад

It would be really difficult to get an LED to emit X-rays. 10 nm light has 124 eV per photon and it's barely even soft x rays. There's no first ionization energies over 25 eV. There's no second ionization energies over 76 eV. Beryllium does have a tertiary ionization energy of 153 eV but getting it to actually do that in a solid state device would be rather tricky given that its outer electron shell has to start already totally empty. Oxygen and Fluorine apparently have 6th ionization energies in the right range, which is neat because you're not pushing them past the octet to do that. Even so, that involves creating very angry ions that will happily rip electrons off of any material they come into contact with. And keep in mind we're trying to make a device that actually survived being turned on and doesn't leak immense amounts of power into ionizing the device itself.

@zachcrawford5 Год назад

@@petersmythe6462 I'm kind of surprised they can even get a respectable UVC led that doesn't destroy itself in minutes. The only way I can see getting X-rays out of a diode is going back to some kind of miniaturized vacuum tube where inside you are shooting electrons off an actual cone onto a receiving plate, almost like an actual physical example of what the electrical symbol for a diode depicts. But this kind of feels like "cheating" even though it would technically be a diode.

@Adreitz7 Год назад

@@zachcrawford5 One of the great German words: bremsstrahlung!

@cancan-wq9un Год назад

Did banana test with my 25W UVC + O3 lamp. Banana stayed under the lamp for 30 minutes from 3 cm distance. The surface closest to emission was literally burned, while the part under the tape was untouched. Also It wasn't any hotter compared to the rest of the banana.

@Danny.._ Год назад

very interesting stuff, as always! can you find a similar 20w halogen bulb or incandescent bulb to compare with the uvc bulb and the banana? or measure the heat coming off the bulb and use an oven to simulate it?

@entropyachieved750 Год назад

Interesting, thanks for sharing

@Enjoymentboy Год назад

A more scientific instrument than a banana?!?!? NO way!!! I never would have thought I would live to see a time when we had better scientific instruments than bananas. What a time to be alive. :)

@Iswearididntdoit Год назад

bro u are the best thanks alot for this video, one more really great video

@JustPyroYT Год назад

Yay! A new Video!

@YTshashmeera Год назад

I wonder, when you were shining the UV lamp, is it possible to see photoelectric effect? Possible future video maybe?

@pioneerAv Год назад

I love the little "megawatt" jab

@catalinalb1722 Год назад

Didn't even know that something like that existed! Thanks Brainiac! 🙂 👍

@stevenw4549 Год назад

I like how you talk. Soothing voice you have.

@Blackwing2345635 Год назад

Actually doubling borderline violet LEDs are such a great safety feature, i would expect them to not to do this) As well as turn over protection though, but intuitive indication is more important. And yes, banana test requires longer exposure + after slight UVC burn it can take some time for enough cells to finally die (you will notice that unexposed area darkens slower)

@SgtFvMC Год назад

Very informative 👌

@wisteela 6 месяцев назад

Very interesting and informative

@honzajuricka2612 Год назад

Great video, thank you

@norfolksouthern37 Год назад

Fascinating

@lemonke8132 Год назад

i like how we had a spectrometer the whole time but still decided to start with the banana test

@namshimaru Год назад

I love this channel.

@medienmond Год назад

what btype of sunglassea where that in detail? would thei protect eyes from light out of a resin printer or laser cutter? please let me know...

@satibel Год назад

I'm curious, does the aluminum sheet covered in sunscreen still reflect the uvc?

@piotrkubik2307 Год назад

Ozone: Protects us from deadly UVC from the sun People: Create UVC sources under the ozone layer and endanger themselves Ozone: -_-

@Skylancer727 Год назад

I'll be honest, I actually bought a UVC lamp for my shoes when I got athletes foot. Had been dealing with for nearly a year at that point with my doctor even giving me steroids, but eventually I just said screw this and bought the lamp. The athletes foot went away in only a few weeks. Downside is I didn't know most transparent materials absorb UVC, been just using my second pillow and hoping none of it reflects. From my bed even if it gets out is shouldn't hit me. Still, I'm well aware UVC is absolutely horrible for you. Even worse is my lamp doesn't even have that violet shade to it, it raw UVC so it's even hard to see if it does leak out.

@bastian_5975 Год назад

If the banana thing is true, it'd be very interesting to see if it's possible to make a camera for UVC out of banana peels, either whole or ground up into a paste

@meskgiggs8616 26 дней назад

awesome video. very good!

@lost4468yt Год назад

I do wonder if a specific amount of UV B and even C is better than no UV at all. The theory goes that a natural amount of UV triggers various functions, including the immune system of the body, and generation of protective mechanisms. I wouldn't be at all surprised if that's one of the many triggers, after all evolution loves a good hack. It's really good at using what is available, so a trigger for cleanup/maintenance mechanisms based on minor damage is precisely the thing that it likes to select for (because it's the simplest way to implement a complex mechanism, it's not like evolution is aware, it's just the simplest route for it to randomly happen a few times). But given that we've heavily interbred between different skin tones, and have created very controlled environments, figuring out how much UV would be best for you specifically would be super hard. And one of the most significant differences between ethnicities is on average how much UV someone can take. An amount to just about produce enough vitamin D in a sub-saharran African might absolutely roast someone from Norway or Finland.

@william21186 Год назад

Never thought I would see a banana with a tan line 😂 Another great video!! 👏👏

@forgingluck 5 месяцев назад

The safety data at the end of it was the most interesting. I wasn't expecting simple polycarbonate to absorb it so completely. What did they use over the diodes that was uvc transparent?

@kamipls6790 Год назад

3:15 A more scientific instrument, than a banana?! Impossible!

@deaultusername Год назад

What spectrometer do you use? and have you done a video on it?

@yourlocalfestivefurry354 Год назад

The fact you use the same music as scp illustrated makes this so damn unnerving

@teslacoiler Год назад

Look at 8:36.... there is a very small fade in the left part of the banana (which is caused by the previous exposure to LED UVC light). BTW, the banana works well to detect UVC but requires quite a lot of dose (i.e. at least an hour for LED or at least 10 minutes with mercury vapor tubes) and also quite a lot of developing time (at least one day after the exposure)

@jaedenspider877 Год назад

What a cool device

@tastyw0rm Год назад

I found myself automatically squinting and looking away when the light was toward the camera - and automatic response 😂😂🤣🤣

@newpeppe 6 месяцев назад

Well done, really interesting video 👍🏻 just out of curiosity, what's the equipment you use for spectrography? I'd like to acquire one. Thanks in advance

@qutube100 Год назад

Very interesting wideo thankyou i learned stuff cool!

@jupiter_ios Год назад

New video - nice!

@sergiosarmiento4233 Год назад

I love the banana test lol

@MattyEngland Год назад

Very Interesting.

@RomanoPRODUCTION Год назад

Dear Brainiac, you have certainly noticed that UVC LED have metallic casing otherwise the casing would be quickly destroyed by the UVs. Also they use special clear resin on top of the LED to let the UVC out of the LED. So the first check for UVC is metal casing, it is very expensive compared to plastic casing.

@roysutherland9729 Год назад

Good job.

@Gubby-Man Год назад

I started wondering what light spectrum the sun emits and immediately got the answer. 👌 Can you somehow use a spectrometer to test different sunscreen lotions?

@zachcrawford5 Год назад

You could take a quartz plate (quartz is transparent to uv where normal glass is not), place it over the spectrometer, take a base reading than apply a thin layer of sunscreen on the quartz plate and take another reading. Than you just take the difference between the two readings to figure out what the sunscreen is doing.

@MongrelShark Год назад

That Frequency is GOOD for AOP (Advanced Oxidization Process, 254.7nm is ideal). If you still have ozone generator combining with UV LED to make a smal water sanitizer could be an interesting project. I think you can swing the peak lower by cooling and higher by heating too (peltier should do it). Did quite a bit of reaserch into UV LED AOP a few years back but the boss shelved the idea due to cost of the LEDs at the time.