Good UV versus bad UV. All available on eBay.
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- Опубликовано: 10 ноя 2017
- After a recent event in Hong Kong where people attending a fashion event were exposed to dangerous levels of short wave ultra violet energy, I decided to make a video on the different types of UV tubes available on eBay. That includes the dangerous UV-C type that can cause eye and skin damage.
One thing I missed in the video was the importance of UV in the making of vitamin D in your body. A reasonable amount of exposure to sunlight is actually desirable.
A link to the Hong Kong incident:-
www.hongkongfp.com/2017/10/26...
It's been pointed out that the main mercury hazard to hatters was the use of mercuric nitrate in a process called carroting.
en.wikipedia.org/wiki/Felt#Ca...
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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I feel like big clive might actually save me from a lot of pain at some point in my life.
Like the taste of Meths. Next, mineral Turpentine.
oragamihawk Clive has saved my life. He inspired me to get a multimeter. When I thought I turned off the switch for the room, I double checked with the meter. It was still on. Wouldn't have checked if I never watched his vids. Thanks Clive!
I turned off the switches from the circuit breaker which SHOULD have been for the room, turns out whoever installed or added it wired it to a different switch. Guessing it was an amateur electrician.
John Howard even if a switch is off it might be breaking the circuit from "downstream" of the device or room, not from "upstream", which means the device will deactivate but there will still be power going to it.
For sure... "hide the evidence" :D
i expect you’re about to get a bump in views and shares on this, considering that hypebeast have just held another event in Hong Kong using UV-C as decorative lighting recently
I’ve used a portable black light for hunting scorpions in the desert at night, and more recently a UV LED flashlight. The fluorescence of the exoskeleton makes them highly visible and easy to find. No one knows why they evolved to fluoresce.
Same thing happened to me.
I couldn't find any UV lights in my area for quite some time, and when I saw that they were selling UV lights in a nearby store I went and bought 3.
I noticed that they were different, clear tubes labeled as antibacterial UV lights. The guy in the shop turned them on and they seemed a little weak, but I bought them anyway.
When I got back home I wired them up to test if they work and turned them on for 2 minutes.
After that I went straight to bed.
4 hours later I wake up and can't open my eyes, they are burning, tears are running down my face and my eyelids can't open no matter how hard I try. It felt like someone filled my eyes with superglue.
So I was there laying in bed for 1 hour in pain trying to open my eyes. After one hour I managed to slightly force my eyelids open, just enough to see where I walk.
So I went to my kitchen and my mother was sitting there with my aunt drinking coffe.
They were shocked when they saw me, my eyes were blood red and my lips trippled their size. So we went straight to emergency and they gave me 4 alergy and blood pressure injections.
Next morning it was still the same, so I was thinking about it and thought myself "what if the UV lights burned my eyes"
So I googled it and turns out that the symptoms were the same as of welder's flash sickness. So means I had arc eyes.
I went back to the emergency and this time they prescribed me some eyedrops which really helped.
But I felt a slight burning sensation on my skin for the next 3 weeks.
S Core - ouch. Did you come down with a cold several days later? I have noticed that in closed areas with lots of ozone, it reduces your immune system. I was in a classroom where we built a bunch of large Tesla coils and ran them, smelled of really strong ozone, we all got sick in the following weeks.
PapaWheelie
No as far as I remember I didn't catch a cold. That was back in June and I wasn't sick since then.
Funny thing that happened. The following morning I was sent from the emergency to the main hospital, and was sitting on the bench waiting for the morning shift to begin because I was too early there. Back then I was still unsure if it was some sort of allergy or if the UV lights caused it.
A nurse came out of their hospital wing heading home, looked at me and said "Have you been welding?" with a wide grin on her face.
S Core - ozone must not have been too thick then good - take care man and thanks for the warning
Damn! That's a cautionary tale if I've ever seen one! Glad you turned out ok. No permanent eyesight damage?
Ultraviolet, or as its known in Scotland: Kryptonite
I know its been a year but i dont get it.
@@tyngchinchillachang838 Scottish people dont get a lot of sunlight and therefore are veeery pale
@@senorcapitandiogenes2068 oh i see how it is.
@@senorcapitandiogenes2068 it's because of the accent they understood ultra violent light so they hide away from the sun.
Oh, I the thought the word racist was the new Kryptonite.
In UV nomenclature, the letters are as follows:
A = Altered
B = Burned
C = Charred
You don't want to get anywhere near UVC unless you want to become a crispy critter.
loved it.
C = Cancer
C = "clean"
@@moraleza5141 qwwwttetrrtyddteyshq vfhwgsfcacwcfgvuuhhubwiy asdyva yv ga yyss us gnywnwthywytreeeeehywh
@Josh Barney u good? Do I have to call an ambulance? It sounds like you are having a stroke
There was a case years and years ago i remember hearing about. A woman who wroked in a butchers started to get blistering on her face, after loads of tests and stuff, turned out to be the manager who changed the UV bulb in the bug zapper for a cheap UV bulb that was burning her skin.
As a person with an unnaturally high number of UV lights in my life due to my weird obsession with things that glow, I very much appreciate this informative video! Lots of good information
Medicinal use 😂
you have a collection of tritium tubes?
Where can I find a white paint that glows white?
Just make sure to not kill your braincells and put strain on your eyes.
I once worked for a filtered water vending machine company. (Where you take your own bottles to fill.) Their machines used ultra violet sterilizers as part of the reverse osmosis filter system. The high-output UV tubes were three feet long and housed inside a stainless steel box. Water flowed through clear quartz tubes next to the UV tubes to be sterilized. I was told the UV would kill some bacteria, but not all. However, the UV would damage the surviving bacteria's DNA so it could not reproduce. For safety, the enclosure had an interlock to switch off the UV lamps when the cover was removed. When the UV lamps eventually burned out, the machine used a current sensor that shut the machine down until the lamps were replaced to avoid dispensing unsterilized water. The main problem with the machines was that they tended to leak from their many internal plumbing connections. The job kept me busy.
Thomas Levy it is my understanding that UV, or rather the ozone it produces, is far more effective at killing cryptosporidium than chlorine or chloramine, which is why UV is now used to sterilise drinking water in addition to adding chloramine.
When the water machines were originally designed, ozonation was the standard for sterilizing water. However, our company needed a cheaper way to do it for the stand-alone machines. UV was chosen as it is simpler and less dangerous to handle than chlorine. The company also bought out a competing filtered water outfit who used a smaller, but more efficient vending machine. Its single UV tube was mounted inside a water jacket that allowed the water to come into closer contact with the UV source without the extra glass tube in between. Their machines broke down much less often, too. Unfortunately, the company decided to do away with the better designed machines for standardization. Naturally!
Soundspark: Correct. To try to keep my reply brief, I did not mention that the UV tubes were replaced on a regular schedule -- unless any of them failed before that. These were special UV tubes which looked more like neon tubes having only one terminal on each end. I was told they were quite expensive and the company replaced thousands of them every year.
Friends, if those words are correct ", the UV would damage the surviving bacteria's DNA s " then that machine is making super-bacteria's . The explanation is long but to make it short: bacteria don't reproduce like humans, they don't need an opposite sex mate. They reproduce by themselves . So if you damage the DNA they're single purpose is to survive and they will recombine DNA so the next generation won't be affected by UV or who knows what malefic purposes will they develop with the help of that UV theory.
@@Hi.Al.
I would agree that it may not kill all and only damage the bacteria, but as a counter point there have been no incidents that garnered much attention. I would also argue that one of the few things we do know is that unfiltered (no atmosphere) sun light kills everything in short order.
A problem with the UV tubes used in tanning salons, is that over time the coatings on the inside of the tube breakdown and they begin to allow (low levels of) UVC to pass through. The manufacturers usually suggest a lifetime of 1000 hours at the very most before the bulbs should be replaced, but you can bet that most high-street salons aren't counting and only replacing them when they either fail or become obviously dimmer.
The tubes tend to get hammered for maximum output. They trade off lifespan for a higher intensity.
when we were kids (about a billion years ago), we actually played with liquid mercury at school... and apart from forgetting everything, and peeing my pants three times a day and forgetting everything, it didn't seem to have done any damage.
You don't want to do that as an adult, if you wear a wedding ring!
@@mehere8299 a platinum ring to be specific
@@mehere8299 Mine got "amalgamated" while I was doing some contract work for a dental supplies company.
Clive, I'm really glad you made this video, because very few people know how dangerous some types of UV can be.
A few years ago I almost blinded myself with some UV LEDs of unknown wavelength.
I ordered white ones, but the seller sent me UV ones by mistake and I decided to keep them any see if I can find a use for them. I made a sort of UV projector with about 100 of them soldered on a test board. I powered the thing on and everything lit up around me like a Christmas tree. After a few minutes my eyes started to hurt really bad so I turned it off in panic. The pain went away after some time and I thought that all was ok, until the next day when talking to my mother I realised that in a certain area I wasn't seeing her face anymore. It was really weird, because it was not a black spot or something, it was just "missing visual information". The blind spot was maybe the size of half of my palm at arms length. I have no ideea, even today, why I did not go to an eye doctor, but luckily this problem went away by itself after about a week. Now I realise that if I would have kept those LEDs on for a few minutes more, maybe I could have done some serious and ireversible damage to my eyes and this freaks me out when I remember the whole thing.
From all of this I learned that you should never play with anything that emits UV, unless you absolutelly have to, and even then wear all the possible protections!
Those LEDs were most likely UVA and these particular wavelengths do indeed cause retina "sunburns", which basically mean black spots.
Even blue light without any UV is harmful for the eyes.
Be careful with UV, blue and white LEDs.
Be also careful with blacklight tubes as they emit... you guesses it UV !
(UVA to be more precise).
I worked as an electrician at a meat packing facility. The air handlers on the roof had uvc bulbs installed to sterilize the air coming in. They were 4' bulbs, and they had a very visible bead of mercury inside. These were new bulbs received in 2016. Our HID bulbs also had visible murcury inside.
One of my first exposures to UV lighting was a wedding reception at a bar. The bride came in and was still wearing her gown. The snow white gown however was invisible. Unfortunately for her the lingerie she was wearing under it must have been treated to make it VERY visible in UV....
Trashy
Modern leggings show through under bright sunlight. 🤣😂
And yes some women don't wear panties.😯
@pepperSnakes True. She didn't know that most white clothes are treated with an enhancer that makes them show up as "bright white" or that it had the bad side effect noted above.
It's harder to find a vein to inject under blue light.
When I was in A&E I noticed the intense blue light in the toilet, so I asked the receptionist. I was pretty surprised.
Gareth Evans It’s pretty easy to get round. Some cities paid loads to install blue lights in all their public toilets, so all the druggies started marking their veins with a biro before they went in...
Because instead of addressing addiction scientifically, let's just gloss over the issue by removing the means
Cin Lee - its not even removing the means - users will likely just do their best in the conditions they have, probably missing the vein in the attempt and doing much more damage than the drug itself would do, resulting in abcesses, infections, and possibly amputation & leading to extra social & healthcare costs. A policy of 'harm maximisation'. But at least the proponents can feel a smug sense of accomplishment that they have inflicted some misery on those they despise, despite the larger cost to society.
@@censorthis-uu6cc this is the problem with some people and their desire for managing society via bureaucrat decrees. Disconnected people in politics think we as humans are just chess pieces, and we can be moved how ever they want, and we will predictively act according to their studies and theories. Its sad how low level thinking these city planners and politicians are. They think if they declare x, then y must happen. But humans are creative and adaptable. They think taxing the rich works? The rich adapt and hide their wealth differently. They think uv bulbs prevent junkies from finding the vein? Junkies adapt and bring a marker in to chart the vein or use a lighter to see it better. Ok, well do planners and politicians adapt to further attempt to solve the initial prb? Nope. We did our decree, and our jobs done. Next issue. Move on to the next pork belly expenditure.
Another quality video, you beat the entire terrestrial UK TV menu at primetime yet again.
Very interesting presentation on UV lamps! My favorite use of UV-C is erasing EPROMs!
I remember something on a BBC programme (EDIT: Turns out it was Bizarre E.R. on BBC Three) and there was a case where some kitchen staff were coming down with the symptoms you described with skin burns, eye troubles and other things, they examined the kitchen thinking it was chemical burns, but after several investigations they couldn't work it out, it was only after it failed to light that they found someone had replaced the tubes in the kitchen's fly zapper with the germicidal tubes, resulting in the damage to the staff...
Thorough explanations of UV lights! Thanks a lot! Cheers!
Just discovered you man
I love your attitude and wisdom
I'm a younger guy, worked in electrical for 5 years. I appreciate any knowledge you spread
That the plastic lenses don't block UV while glass does is a myth. CR-39 and PC are naturally somewhat transparent to UV-A, but block lower wavelengths. PC for prescription lenses is modified to block UV quite sharply, and CR-39 comes out porous and the UV protection is added to the sealing resin that the surface is treated with. Trivex and high-index optical plastics are also engineered to block UV.
PMMA is an interesting case, it's largely transparent in UV-A, severely attenuates UV-B, and has a very surprising UV-C transmittance window, up to 40% at some wavelengths, and i'm not 100% certain, but i think it just narrowly misses the germicidal tubes, which should be 254nm, while it has a transmittance window around 260-270nm. Haven't heard it ever being used for prescription glasses, though it is possible, it is certainly a valid optical material.
Siana Gearz Was reading down the comments to see if someone would point this out. You should have been wearing specs with PLASTIC lenses Clive, glass ones will not give the same protection from UV!
Well to be fair the Schott glasses that they use for glass lenses are also engineered for a sharp UV cutoff nowadays, but this didn't quite always used to be the case. I think the myth originates from comparison of greenish window glass that isn't used for lenses with PMMA. If you replace your house windows with Plexiglas, you can get a tan, and it can even get dangerous if you're under an ozone hole.
I use these lamps for my fluorescent mineral collection. Different minerals glow under either uv-a,b or c.I use a black light blue(also called uv longwave) and the germicidal(also callled uv shortwave).Only recently we've been using uv-b(midwave). The most expensive part of my hobby is the filter for the uv--c. You need the filter to block out the visible light but that lets through the uv. I'm talking hundreds of u.s.d.. but oh,they're awful purdy!
If you're curious,RUclips has a few clips under'fluorescent minerals', 'Franklin,New Jersey' and 'Sterling Hill Mining Museum'. Also,most Natural History museums at least have a modest display. Be careful,though - it can become an obsession. Trust me.
Hello,
How do you protect your eyes while using the UV-C light to make minerals glow ?
UV-A will not cause much issues if it's of a low enough power, however the same can't be said for UV-C which will cause eye burns just like welding arcs if you get even a few seconds of exposure.
In fact germicidal tubes should only be used in the absence of people in the room to be sterilized.
This is precious information!! Thank you so much for taking the time to explain all of this!!! Appreciate it!! 💕💯🙏
You have 995k subscribers! So close to a mil! Congrats!
I've seen large clear UV tubes used in science labs for killing germs, bacteria etc. The light switch (for just that tube) is outside the lab and has a big red indicator and a warning to prevent exposure to that light. Thank you because this is a very important video. I've been told 'if it smells like ozone near a lamp and you don't know what that lamp is, prevent exposure'.
Thank you Clive for this video! I remember once I was at a sort of thrift shop in the US called Goodwill, and there was a device that was about 6 inches long and looked like a small chest, but I noticed the lid of the chest had one of these clear bulbs in it and was powered by some batteries or power supply, I forget now, but it was a low voltage florescent tube driver and I considered buying it just for that cool tube and driver circuit as I had never seen a clear tube before and I wanted to know what was inside, I am very glad I didn't as that tube was one of these UV C ones as well and I would have not known about that and possibly used it as a cool light for accents or something. Thank you for making awareness about these tubes and keep up the great content as usual :)
Utterly fascinating. You put some sparkle into a humdrum sunday evening. Thank you big man.
Clive, those ones that cause skin damage are great for water processing. They kill all the bugs in the water that cause sanitary problems for people, as the water flows through the treatment chamber and without chemicals being added. It's super neat stuff to work with. The ones I worked with where encased in quartz sheath that protected the bulbs from the high pressures. I love that you covered this sort of application. Great vid Clive.
UVB/C is sometimes used in geology where the minerals fluoresce only under short wavelengths (~250nm)
I wish he would have covered which wavelengths / bulbs are best or what... like examining currency, finding pet stains / blood residue and curing uv setting glue, etc...
Also for indoor growing. Certain plants will try to protect themselves from UV A/B by producing more resin. A good way to increase potency.
@@hellrazor117 "certain plants"
I remember a club bar in Newcastle when I was a Student (Late 70s.), that was lit entirely by the fluorescence of the quinine in a row of tonic-water bottles, lit by UV. I thought it was really cool at the time.
Thanks again for another great video! Learned a lot, then went out and researched info on wave length.
Very valuable information Clive! Thanks for the explanation of the difference between UV light and the dangers of some of the wavelength.
Oh the sand in the eyes feeling I rember from my younger years from wielding
Without mask ? 🤔
germicidal tube is (or was) also used to erase EPROMs thru their little quartz window on top of the chip.
UV LEDs are available, but it is hard to find the ones that put out enough UV to excite hi-vis clothing (or laundry brighteners or bio stains, etc) like a "black light" tube.
bio stains hurrhurrhurrr
CREE do good ones - long wave UV torches (popular for money checking, and also very popular with Mineraologists / Geologists). Pretty short lifespan in comparison with "usual" white light LEDs
we use this at work. it lights up uv spary we put on boxes to get the right amount per bundle. uvgear.co.uk/product/product340.htm
There are some very cheap "365nm" flashlights on ebay. I have one of these, but I would be really interested if it really is 365nm. At this price, there has to be a catch, as quality UV flashlights go from $50 up. www.ebay.com/itm/Zoomable-Led-UV-Flashlight-Torch-Light-365nm-Ultra-Violet-Blacklight-AA-Battery/112056431233
I recently bought 100 300nm UV leds.
Thank you, very informative. I was posted in the Holy Loch U.S. Navy 1972. I loved Scotland and the great hospitality of the folks there, the beautiful scenery and history.
About 7 or 8 years ago my parents bought this strange contraption. When I asked them what it was they said it was an air purifier to keep germs from spreading.
For the longest time I never knew how it worked. After watching this video it all makes sense now! The light it used is UVC light. It had all the signs of UVC; ozone smell, only use it when people aren't in the room, don't look straight at it or expose skin to it.
Thank you BigCliveDotCom for these amazing informative videos! Keep up the good work!
And this has been an episode of "Love Your Epidermis" with Dr. Clive!
Thank you, I was looking for a video like this the other day and watched heaps but didn't get a complete picture so thanx for telling us the types and effects of all three, I wanted to know if the lights were different depending on using for water and air and room, so you cleared that up for us. Cheers
Wow. This videos, like many others, are pure gold.
the uv A & B we used in accelerated weathering chambers. t12 4’ lamps. great job explaining
the difference with the different types. have a great day.
Excellent video Clive , I can imagine a lot of people prob buy the wrong bulbs just to save a few pence not even knowing the hazards ! This is the sort of thing del boy would of flogged as display cabinet bulbs lol
Pauly H
Still remember the first time watching this. I must have only been about 7. lol
ruclips.net/video/zCV6_FKPuKA/видео.html
Loved the video Clive, it got me wondering about uv LEDs used in some lights/torches. I use the uv curable glue and the standard uv led you get with it isn't that powerful so I tend to use a violet/uv laser pen which cures the glue very quickly but the exothermic reaction is greater as the glue goes off. But neither my led torches or the laser will cure K300 uv resin which cures to a flexible finish, only a few hours of daylight seem to cure this one? Is it true UV you get from these LEDs or just violet light close to the uv spectrum? BTW I use yellow goggles when using the uv laser to prevent the back scatter which are plastic, should I get glass one's? Cheers and ATB John.
Loved the video Clive, it got me wondering about uv LEDs used in some lights/torches. I use the uv curable glue and the standard uv led you get with it isn't that powerful so I tend to use a violet/uv laser pen which cures the glue very quickly but the exothermic reaction is greater as the glue goes off. But neither my led torches or the laser will cure K300 uv resin which cures to a flexible finish, only a few hours of daylight seem to cure this one? Is it true UV you get from these LEDs or just violet light close to the uv spectrum? BTW I use yellow goggles when using the uv laser to prevent the back scatter which are plastic, should I get glass one's? Cheers and ATB John.
UV leds are still struggling to get to the shorter wave lengths at energy levels needed for this purpose
Remember, most of it is non-visible, so it might not LOOK very powerful, but there could still be a lot of dangerous energy being emitted!
Hey Clive, nice video. I'm surprised you didn't mention optical brighteners in washing powder that make clothes seem ultra-bright under black-light-blue lamps and I'm also surprised you didn't mention that the insectocutor-type (white phosphor) lamps are the ones you should buy for your photo exposure box for making pcb's with photoresist boards.
Technically speaking the blacklight blue may work for PCB exposure too. I'll have to give that a go.
Thank you for making this informative video! Now I understand why my blue led strip charges glow in the dark tape so quickly! I always wondered how harmful the regular purple uv lamps are for skin and eyes. Good to know coated glass eye-protection helps shield your eyes. The fact that they subjected crowds at an event to UV-c is frightening.
Super fantastic and quite informative video Sir Clive! Thanks again for another educative video. I saw you holding the cheap clear one on with bare hands and exposed skin. I always thought they would cause blistering and 2nd degree burns, permanent eye damage almost instantly. Yes, I actually thought that. I was quite dumb but not anymore thanks to you. It also doesn't mean that I'll be getting some of those to turn on like at the Disco.
I heard "germicidal" as "genocidal" at first
with UV-X, it can be both.
Well. It's a germ genocide isn't it
Well it depends on how you use it right? Im sure enough uvc can be lethal, so exposing everyone to loads of it is genocidal
I was at a rave once and woke up the next day and for a couple days and my eyes felt like I had been playing around on a beach, but i live in Tennessee nowhere near a beach in the middle of December. Maybe thats what happened
could have been the LSD
It was...
Great tutorial on Ultra violet light..Start looking for this application in farming and indoor gardening soon.
Professor Clive delivers again. Great Job!
Thank you for the tip I will never go anywhere near a clear tube if it’s energised. Pretty scary when you think about it a small current passing through the mercury vapour can actually change the structure of matter around it!
Good video and interesting incident in hong kong. Makes you wonder about the attention paid to safety of event goers. At EDC (big rave in Las Vegas) I found myself taking notice of some of the practicalities for the crew doing sound and light effects. Some of the stages were under a big arch, so stuff like laser effects were quite common as they could land the lasers on the canopy. Occasionally there would be a big laser display over top the crowd in one of the big open-air stages and it would be "Holy shit that looks amazing.... wait where the heck is that landing?" look back and it would usually be the signs above the perimeter of the raceway, or in cordoned off areas of the bleachers, occasionally somewhere clever. In comparison to rinky-dink venues where lasers land all over the place including down in the crowd. Really makes you appreciate that the lighting guys arent just hefting gear and cables, but also vital to peoples safety at an event that's supposed to be recreational.
The laser standards at professional venues are strict about not allowing direct eye contact. In cheap clubs it's not uncommon for DJs to point powerful lasers directly into the audience.
It would be interesting if you could get your hands on a pro laser effects unit (something nice like a laser equivalent of the PRG lights you were able to show us) and compare it to an ebay special. Its been a while since Ive looked into them, but don't the real pro units have safety stuff such as stuck/faulty galvo detection, physical stops to prevent the beam going into the crowd, etc? Plus I'm sure a liquid sky in your dining room would make for a nice dining experience.
"Its been a while since Ive looked into them..."
Don't look into laser with remaining eye!
TechBench *NICE!*
It's all about the timing.
(Accidental pun.)
Really a fascinating and informative video, Clive!
Thank you for making this video. I was going to order one a while ago but didn't want to spend the money because all of them are claimed to work and or be the best.
Mmm the smell of bleach and singed bacon - the essence of a fashionable night out hong kong style.
I was sure you were going to mention the optical brightening dyes used in laundry detergent to make shirts look whiter than white at some point... but it never came.
The singed bacon demonstration in this video was unexpected. Even for the sake of science I wouldn't want to do that just for the RUclips vids.
I was wondering if you have ever looked at GTL3 germicidal UV lamps, they look like regular E14 screw-base clear incandescent night light bulbs. I bought three of them for replacement in a vintage "air purifier" that is absolutely tiny and has very little airflow, yet is claimed for use in entire homes. The air purifier isn't really filtered, it's sort of just a small fan with a cluster of these GTL3 lamps. I have a sort of strange suspicion now, after viewing your video, that this antique air purifier may actually be functioning as an ozone generator.
Thank you bigclibe for booth a entertaining and informative video👍
Excellent info big clive! Thank you for this video. Your one in a million
The other main use of UVA & UVB that was not mentioned is in phototherapy for skin conditions. Specialist tubes for precise wavelength control.
Thanks Clive :-D
Years ago i bought one of the clear ones, i was making an eprom eraser box.
I included door switches to cut the power, along with a big red lit up mains rocker switch.
Sounds like i made the right design decision lol.
You make the best RUclips videos. Thanks so much Clive!
A great video as always Clive. It's so important that people should be alerted to the very real danger of UV and in particular UVC. It's worth mentioning too that even intense blue light is bad for the eyes in the long term. There's plenty about this on Google. I once stuck a yellow sticky note over a brilliant and very annoying blue LED on my computer monitor. Within a week or so, the blue light had bleached a white patch on it indicating that the yellow pigment in the paper had been destroyed.
This reminds me of the mid 90s when blue silk blouses were all the rage for young ladies. While at a gathering at a friends house we discovered that the black lights he had set up for some posters rendered those blouses completely see through. The young ladies in attendance were not amused by this bit of scientific discovery.
My first experience with a UVC Lamp was in an EPROM reset tool, the EPROM has a small round glass window where you can see the inside of the chip and it resets when UVC Light passes through that's why there has always been a sticker on it to prevent it from slowly getting resetted
I really enjoy you videos, thanks for taking the time to create and share
hi, i started watching your videos 1 week ago. I have to say that I think your work is amazing. I'm Brazilian, and I learn a lot from your videos.Congratulations
@@coalthedergsune Don't worry teressa, brazil doesn't want you😘
UV damage to eyes is no joke. On a particularly sunny day, in Australia, I lost my sunglasses, and sank a solid day into some summer time yard work. I got a small amount of that "sand in your eyes" feeling for the next few days (more a minor irritation than a serious discomfort, in my case), but the real kicker was the photosensitivity. The following day, and for more than a week after, going outside was out of the question, during the day. After that week, it was just moderately painful. Just reflected sunlight off cars and other metals felt like someone was shining a spotlight into my eyes. For several months, nearly a year, every time I left the house at night, I wore strongly polarised, though not terribly optically dark, sunglasses. Street lights, and car headlights would blind me completely, without those glasses.
Moral of the story: look after your eyeballs. They will punish you for your carelessness.
The light sensitivity might be from the UV-A and bright visible light while the sand in the eyes aka photokeratitis is caused by UV-B, the same rays that cause sunburns on the skin.
Thankfully they are less powerful than UV-C which might partly explain why you didn't get more severe sand in the eyes.
I got eyestrain and light sensitivity for up to a day and a half on some occasions after having played with powerful blacklights at close range without the right eye protection, however no sand in the eyes as blacklights only emit UV-A.
My latest acquisition is a 400W mercury vapor blacklight and it really is no joke, you absolutely need to protect your eyes with wraparound glasses or goggles that will block the strong UV-A coming from the bulb if using it at close range like I usually do.
When it's hanging 10 meters above the floor at a nightclub it's no more of an issue though because of the inverse square law although people might get headaches if looking directly at the lights still.
So I use ski goggles to protect my eyes from the 400W blacklight at close range and they are actually quite effective but that doesn't really surprise me as they are designed to protect against UV-A and UV-B rays that come stronger with high altitude while also being reflected by snow.
That eye damage is EXTREMELY painful. Feels like you have sand in your eyes.
Fortunately, so long as the damage isn't too bad, it heals quickly. But man does it hurt.
I burned my eyes once while welding.
@Christopher Grant You can still burn yourself even with all that equipment. I've never done it myself, but I have seen it done.
Did you have your shield on back then ?
Awesome Sunday morning watch, Clive. Incredibly informative and fabulously interesting. You do have a great presentation style it must be said, sir. I agree re HSE, too! 👍
Useful health warnings, like many others I have used the UV-C tubes in pond filter applications. I realised they were dangerous but possibly underestimated the effects.
Clive do be aware that it highly depends upon the type of glass used. You're probably right because the type of glass in your lenses is one of the stronger types (quartz glass blocks UVA+, borosillicate passes UVA+).
But polycarbonate plastic lenses also block UVA+ but they do have the yellowing effect after awhile. (Especially hard to notice if one's PC lenses have transistion/chromatic diffuser coatings on them like mine).
The really good UVB is 311-312 nm. It's called narrowband UVB and it has a remarkable effect on the immune system calming it down especially for skin diseases eczema and psoriasis, but also for general suppression.
As always, thanks for the informations!
The old insect killer that I purchased back in the early 80's was designed for farm industrial strength work. It did not fry the bugs, but had a fan that blew the insects into a sort of burlap bag, where they were collected, the fan was rather slow but fast enough to keep them captive, and probably kill them on the way through, it did have a circular black light in the top to attract the bugs into the death fan.
I took a black friend skiing once. I offered him sunscreen but he didn't use it. The next day he called me saying his face felt like it was on fire. He'd sunburned his face. And he was quite dark skinned.
A lot of people don't realize that the sun reflecting off the snow can cause a sunburn even in the winter...
@@brentfisher902 Yep, both water and snow on clear days are quite nasty if you don't wear any protection.
And it doesn't need to be 'hot'.. Especially in the mountains, where there's even more UV, and may never rise above room temp anyway.
@@brentfisher902 There's also risk of eye damage from UV light reflected off the white snow. Skiers, alpine trekkers, & snowboarders would know this. Eskimos historically made special goggles from bones or tusk, with small holes carved in them.
@@emilychb6621 Cloud cover doesn't attenuate UV as much as it attenuates visible light, so cloud cover is deceptive when it comes to judging UV exposure.
UV exposure also increases with altitude due to having less atmosphere to attenuate UV.
Finally, sunscreens often offer some protection against against low humidity and wind in the cold mountains. Both are bad for the skin, especially in combination with UV exposure.
Eric's friend had a lot going against him.
@@jonathantan2469 Called Snow Blindness
Really good stuff. I’ve got a Ph.D. in chemistry and I can’t find any errors. Nice job. Do more teaching videos. You’re good at it.
Crocellian tbf most of this is physics rather than chemistry though.
What a great video, looks like it's stimulated lots of discussion, well done Clive. Kindest regards from Helensburgh.
Great video Clive, interesting and informative, got me thinking, good stuff!
(Watching clear tube light up in video) AHHHH! My EYES! Clive, what have you done?!? ;-)
It's OK the internet acts as an ozone layer
Bozone layer
Just as well that I've still got a glass CRT monitor!
who said that 😎
your screen can't reproduce it. the camera he uses can't see it.
If your phone can produce high energy light like that, you have worse problems.
This just happened again at a Bored Ape event in Hong Kong recently too.
Thank You for teaching me about the light.
I LOVE light.. I'm not a fan of the sun but the science behind it is how I ended up with my job as an RF tech. From colours and microwave ovens or range, to communications and my broadcasting work it still blows my mind. Frequency is just freakin amazing to me. I loved this video and thank you for the depth you delved into. 👌A+ content.
Stay awesome 👍
Just a clarification on the mat hatter thing. Hatters weren't working over a hot pot of mercury to shape hats-they were treating the raw fur with mercury nitrate solutions during the felting process because it made a superior felt for a hat. The process involved heat and of course plenty of mercury vapour.
Yours
Vern
I don't think you get mercury vapor by heating mercury (II) nitrate. Were they heating it to the point of decomposition or the melting point (79 C)?
The danger is that it is a water soluble salt and so, it can pass through the skin. Mercury, lead, cadmium salts are dangerous to handle with no gloves on.
7:50 I know that feeling. Alas it company policy thats messing with me.
14:20 Mercury is a heavy metal and those tend to not leave the body, so I wouldnt play with mercury too often.
Your the best Big Clive❤
Photonicinduction popped 2 of those UVC tubes a few years ago, oblivious to the dangers.. Glad I found this video as I wouldn't have known myself.
This got me thinking about the bizarre event in Cuba where American diplomats were apparently exposed to some type of mystery infrasonic / ultrasonic source which resulted in hearing loss, sleep problems and even brain damage.
If one or two of the UVC tubes were installed in a common four tube office ceiling fixture, the person working in the office would assume, looking through the frosted lens that one or two bulbs are blown out, when in reality they are being exposed to UVC.
.
Yeah, I know it's KGB-style sinister, but the fashion event in Hong Kong was a good example of this situation.
Are you not thinking of the Russians bombarding the US embassy in Moscow with microwaves from 1953 to 1975? www.ncbi.nlm.nih.gov/pmc/articles/PMC3509929/
In reply to B. Hagedash, the Cuban incident happened very recently. www.cbsnews.com/news/infra-and-ultrasonic-waves-thought-to-be-responsible-for-cuba-attacks/ The light diffuser in the office light fixture should block the UVC waves, unless they used the quartz glass that Clive was talking about.
I think you have this slightly mixed up:Infrasonic and ultrasonic are classifications of sound while ultraviolet is a classification of light which the bulbs produce.
Misha M. - Not a mix up between light and sound, just a thought of how sinister things can be done without being immediately noticed by those exposed because they are outside the normal sensory range, but can still result in harm.
I think the Japanese also experimented with microwave weaponry but didn't weaponise it like the Russians. They stopped testing when they realised the moisture in the atmosphere absorbed most of the energy, so it was useless in warfare scenarios.
I'm quite sure at least some of the "crazies" in America claiming "energy weapons" are being used against them are telling the truth. Nothing surprises me any more after years worth of research into what governments have done and are fully capable of! I remember reading about "pain beam weapons" on some crazy websites. Low and behold, the Active Denial System cropped up 10 years later (round about 2005, I believe).
Very nice to know. The only black light I ever had was with the black tube, had it in my barracks room in Nam, lighting up a poster that said "What if they gave a war and nobody came!" in psychedelic colors. Looked great! I had no idea you could be harmed by UV lights, well I knew about the sun and all but not those small tubes. Getting to old now to enjoy such things any more I guess. Oh by the way, I do recall from my time in Advanced training in the US Army, we had a young black fellow who went on adventure training offered for a weekend retreat, he fell asleep on a rubber raft on a lake, and burned the hell out of his back and legs. He was is so much pain, and while in that pain, the Army actually court marshaled his ass for intentional damage to US Property. Man talk about one pissed off black dude! The slavery implications were very apparent when called property, well to him at least. He did finish the course one cycle behind us, as he could not return to training until his burns had healed.
What did the poor black fellow damage apart from his skin ?
Wonderfully explained. I remember those old Christmas lamps, they got REALLY hot just like the incandescent "black lights." I was exposed to a carbon arc lamp when I was young and the next day my eyes did feel like they were full of sand and they were bright red. I did recover after about a week but it was painful!
Thanks Clive, this was a very interesting and informative video !
Back in the 70s some young women that went to some of the parties I attended discovered that UV light would make their bras fluoresce - lol! As I recall, there were some laundry detergents at the time that would promote fluorescence also (Whiter!!!! Brighter colors!!!! etc.)
I think you might be right about liquid mercury not being especially hazardous. If it was, the saying 'mad as a hatter' would have been replaced by 'mad as a dentist'. They use(d) mercury in silver fillings.
Thanks for the video. As usual you're a source of accurate and reliable information.
The bar I used to work on had UV tubes above it. Bras, contact lenses, caps on teeth etc. all used to glow.
aquariums often have a uvb tube... turtles need it for their shell to develop/harden their shells apparently
also aquarium filtration systems use uv tubes to kill bacteria
To be more precise, and repeating what Clive explains in the video, the ultraviolet part of the spectrum is commonly divided into three subranges (from low to high energy): UVA, UVB, and UVC.
The bacteria killing UV that you mentioned is UVC, and luckily it's strongly blocked by our atmosphere.
UVB can cause sunburn and skin cancer, but turtles (including tortoises) need some small dose of it for the same reason that humans do: vitamin D3 production. Vitamin D3 is made in the skin under UVB exposure, and it plays a key role in calcium absorption, which is of course very important for shell/bone growth.
Unlike normal humans, turtles/tortoises can also see UVA. Therefore, when kept indoors, they require an appropriate lighting setup that includes UVA and UVB. Outdoors, sunlight will provide it, better than lamps can. If you do need UV lamps for your reptiles, stick to the known reptile accessory brands (Zoo Med, Exoterra, Arcadia, Zilla, etc.), and don't buy noname products from China or elsewhere, because there are bad lamps out there that will harm their eyes and potentially even blind them.
thanks for the advice, I just recently had a turtle given to me so I have been researching the various types of lighting they require, the tube I got was a uvba&b type so presumably it's as Clive mentioned; uvb tubes are mostly in the a spectrum anyway.
one extra question while you're here: the uv tubes seem to have a number next to them, like a 5 or 6 or 10. I got a 5 (and it was a good brand) is this appropriate for turtle basking light? I take her outside when the weather is warm enough too, seems like a good idea to try and replicate the natural habitat as closely as possible
Yes, the UV fluorescent lamps for reptiles all have combined UVB+UVA output, and UVA makes up the larger part, as with sunlight. The 5 and 10 numbers (or 5% and 10%) are indicators of the UVB amount, but these classifications are quite meaningless beyond the fact that a "10" lamp is supposed to emit more UVB than a "5" lamp, and would therefore be more suitable for animals that are exposed to stronger sunlight in nature (e.g. in deserts). The big brands usually have some guidelines on their websites that tell you which lamp is suitable for which species. Distance between lamp and animal, and presence/type of a reflector also strongly influence how much UV arrives at the animal. If you want to be absolutely sure, there's no way around buying a UV index meter (better than a pure UVB meter), and measuring the output of your lamp at the appropriate distance yourself, then comparing it to the UV index that the animal would experience in the wild. The Solarmeter Model 6.5 is a good meter, but unfortunately not cheap (around $250).
Since vitamin D3 production is temperature-dependent, you also need to co-ordinate your UV lamp with a heat source, e.g. an incandescent basking lamp, because fluorescent lamps don't produce significant heat. There are also mercury vapor and metal halide lamps for reptiles, they're all-in-one lamps that produce UVB, UVA, visible light, and heat. I'm using one of those for my tortoise hatchlings nowadays, instead of fluorescents.
hmm yeah, I'm the type of person that would like to have light spectrum, water quality, filter water flow, temperature etc sensors monitoring the tank but well.. might take a while with the cost of some of them. I'll check out the tube manufacturer's website and I subscribed to your channel, I'll be sure to check out any care/ habitat videos.. unfortunately it's hard to find turtle care advice locally so I have been spending a lot of time reading on the internet, thanks for sharing
Commercial (in store) salt water aquariums use UV C in there filtration systems. I used to work for a company that built store aquariums like that.
Consumer (at home) aquariums you have the option to put one in like Clive mentioned
Reptile terrariums have a UV lamp similar to the white coated one.
Your better lamp fixtures for aquariums and terrariums will have a "Reptile" or"Fish lamp" (we used a cobalt blue lamp" and a "Sun lamp" one bluish tinted and the other as white as you can get..
I've learnt so much from your videos, thank you!
Excellent Clive, didn't know the clear types even existed!
At night road works sites where they wear white uniforms w/ fluoro stripes paired with the UV flood lamps is like driving past a Daft Punk concert.
UVC is also used in printing plate machines. I had a machine with 45 100w UVC lamps, 46 80W UVA lamps to set the printing plates
I was fiddling around with my own UV-C lamp to get it running, fed by an induction coil driver (around 5 to 12 volts) and HF transformer. It worked (eventually) like a charm. I knew of the ozone but the fact that my hand was smelling like burned flesh after a few seconds nearby the lamp, got me a bit worried. I googled it, couldn’t find an answer. By accident I saw this video (as subscriber I’ve seen quite a lot of Clive's vids) and finally got an answer! Thanks Clive! Same effect from my 100v deuterium lamps as well too...
Glad you mentioned the bit about engineering Clive. My son is about to switch at year 10 to go to engineering college. I keep telling him he'll hit the ground running in terms of earning a crust. Thanks - he heard your words.
15:08 you did a good job of walking that tightrope 😂
Does anyone remember the clear tubes for EPROM erasers, the same kind as germicidal 254nm I think.
Ebay still sells EPROMS and EPROM erasers !
Massively interesting thanks Clive
Excellent run down on the UV range. It cleared up a few points I was fuzzy on and it's something I'll keep an eye out for in the future. It'll probably be a small or amateur company that'll bring one of those UV nuke lamps in and I'll be able to deal with it much better now. Thanks Big Clive!