Good UV versus bad UV. All available on eBay. 

I feel like big clive might actually save me from a lot of pain at some point in my life.

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.

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.

Ultraviolet, or as its known in Scotland: Kryptonite

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

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.

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

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.

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.

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.

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.

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!

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....

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.

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.

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.

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'.

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...

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,RU-vid 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.

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.

Very interesting presentation on UV lamps! My favorite use of UV-C is erasing EPROMs!

Oh the sand in the eyes feeling I rember from my younger years from wielding

Another quality video, you beat the entire terrestrial UK TV menu at primetime yet again.

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.

UVB/C is sometimes used in geology where the minerals fluoresce only under short wavelengths (~250nm)

This is precious information!! Thank you so much for taking the time to explain all of this!!! Appreciate it!! 💕💯🙏

And this has been an episode of "Love Your Epidermis" with Dr. Clive!

The other main use of UVA & UVB that was not mentioned is in phototherapy for skin conditions. Specialist tubes for precise wavelength control.

I heard "germicidal" as "genocidal" at first

Very valuable information Clive! Thanks for the explanation of the difference between UV light and the dangers of some of the wavelength.

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

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 :)

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.

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!

Utterly fascinating. You put some sparkle into a humdrum sunday evening. Thank you big man.

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

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 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.

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! 👍

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

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

What a great video, looks like it's stimulated lots of discussion, well done Clive. Kindest regards from Helensburgh.

Great tutorial on Ultra violet light..Start looking for this application in farming and indoor gardening soon.

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.

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

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.

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.

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.

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!

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.

Thanks again for another great video! Learned a lot, then went out and researched info on wave length.

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.

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.

Thorough explanations of UV lights! Thanks a lot! Cheers!

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.

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.

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

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.

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.

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.

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.

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

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.

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.

This just happened again at a Bored Ape event in Hong Kong recently too.

Wow. This videos, like many others, are pure gold.

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...

15:08 you did a good job of walking that tightrope 😂

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.

Really a fascinating and informative video, Clive!

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!

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.

Clive makes it look like he moves the bulb with telekinesis at 5:36 😂

The same happened in a kitchen, (I remember the news item) in the U.K. 30-40+ yrs ago! Someone, (the owner I think it was) replaced the 'burned-out blue U.V's in a kitchen fly zapper, with these types, & it was discovered, because kitchen staff ended up in hospital with severe, unexplained skin problems.

Thank you bigclibe for booth a entertaining and informative video👍

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).

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

i watched a BC vid the other day from _years_ after this, and it featured another Hong Kong UVC injurious event. i have been learning about the EM spectrum after getting interested in lasers, radiation, and science in general, of late. Clive's illustrations of the wavelength of the various UVs was jolly informative. in fact i have become so fascinated i just ordered some 253nm UVC diodes from ebay. just so i can have another intriguing thing to have a play with. i just can't imagine what the colour looks like, and seeing clive's cameras try and reproduce it has made me just need to see it in person. briefly, of course. the diodes were about 4 quid each. so UVC sterilising ebay jobbies costing 20 quid are still jolly unlikely to be ought but a swizz, still.

Excellent info big clive! Thank you for this video. Your one in a million

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

"Smells porky" love it. There's a joke there somewhere about the Muppets.

You make the best RU-vid videos. Thanks so much Clive!

You have 995k subscribers! So close to a mil! Congrats!

Looks like bad UV might be a little more important with corona-chan coming out to play. No wonder youtube suggested this.

The vitamin D3 people get from UV exposure is very good for health. It doesn't take that much to get a good dose of the vitamin. I think around 15 minutes of getting most of your skin exposed probably gives you a good weeks worth of the vitamin D3 and it is a stored fat soluble vitamin. It takes a lot of weeks of no sun and no dietary D3 to become deficient if you started off with good levels. One thing I recall from my reptile keeping days, and in particular the AOL reptile keepers forum(we're talking about the mid-late 90's here) was that for the most needy reptiles, like a Green iguana and many turtles, you can't supplement their food with powdered vitamin D3 enough to prevent a deficiency. They have to get real sun or real UVb supplementation. I wonder if that isn't true of humans too. The supplements are probably okay, but may not get you all the way to optimal Vit D3 levels. People in cloudy cold climates, get every ray of sun you can in the winter, outside if possible, or get some tanning. On vit D and health, Vitamin D3 is very very important for much more than was previously thought, like bone health and calcium metabolism. It is very important in immunity and multiple other things. Getting adequate sun Vit D3 can have significant anti-cancer effects. A Harvard epidemiologist who studies the statistics of disease stated that for every one skin cancer death due too the sun, that same amount of sun prevented something like 20 deaths from other cancers. Bad ones, like colon, breast, etc. I think he dug those statistics from occupational comparisons(outdoor workers verse office workers and from people in southern climates versus cold northern climates The dangerous skin cancer, Melanoma, is not really very well coordinated with sun exposure. People get it all over there bodies, seemingly randomly, instead of sun exposed areas. The couple other more sun related skin cancers are all pretty minor, like warts. UV damages our skin my messing with the DNA, but not exactly like ionizing radiation, and creates molecular "bridges" (T-T and C-T)or kinks between specific base pairs. However, our cells have lots of DNA repair enzymes running all over out chromosomes fixing that damage, almost as fast as it occurs. When the damage happens faster than the fixers can keep up, that's a sun burn. I remember something my professor of Molecular Genetics told us about this UV damaged, beside the crazy high rate these damages occur in each cell(100's of time per min/per cell). He told us that the DNA repair enzymes that fix the specific UV damage are stimulated by visible light. Although trying not to be a doctor, with lots of caveats, he said that if you get a bad sunburn, like at the beach, of course get sun screen on as soon as possible, but that after lathered up with SPF 50, going back out into the sun might actually lessen the sun burn. I've tried it, and it works. Here an NIH article about UV DNA damage: www.ncbi.nlm.nih.gov/pmc/articles/PMC3010660/

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.

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 👍

As a ginger I tend to stay away from any type of UV light haha.

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.

Great video Clive, interesting and informative, got me thinking, good stuff!

Love this vid Clive! Light science is so cool. Haha, rule 1 when things go bad- destroy the evidence!

On 'Bizarre ER', an insectocutor was fitted with the wrong bulb & it cooked some eyeballs instead. Search Y.T for: Restaurant Kitchen Mystery - Bizarre ER

A humble reminder: keratitis not keratosis

I really enjoy you videos, thanks for taking the time to create and share

Thanks Clive, this was a very interesting and informative video !

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.

(Watching clear tube light up in video) AHHHH! My EYES! Clive, what have you done?!? ;-)

Professor Clive delivers again. Great Job!

That was a fantastic video. That's impressive while only showing 3 bulbs and a pair of hands for half an hour. My favourite part- "Hide the evidence".