Ingenious hybrid lamp sold in a MINDLESS way...

Can a light bulb be both incandescent and gas-discharge? The little, odd GTL3 lamp seems to be a hybrid between the two technologies. In this video, I take a closer look at the science hiding inside it.
The lamp is sold in two different versions online. Only one of them can be recommended - I show you why!
Big Clive's video on the Royer oscillator: • Unusual low voltage AC...
My Patreon-page: / brainiac75
Recommended videos on same topics:
Light Bulbs | LED vs. Incandescent: • Light Bulbs | LED vs. ...
Metals in glass are AWESOME: • Metals in glass are AW...
Crazy difference between 5W LASER and 5W LED: • Crazy difference betwe...
Did you miss one of my videos?: / brainiac75
FULL MUSIC CREDITS
Time code: 0:01
Mix of two tracks:
1) "Hiding Your Reality" Kevin MacLeod (incompetech.com)
ISRC: USUAN1700081
2) "Long Note Three" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100424
Time codes: 0:41 + 5:10
"Lightless Dawn" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100655
Time code: 1:56
Outro part of "Impact Lento" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100619
Time code: 2:24 + 7:37
"Darkness is Coming" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100584
Intro part looped by me.
Time code: 4:26
"Long Note Three" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100424
Time code: 9:06
"Hiding Your Reality" Kevin MacLeod (incompetech.com)
ISRC: USUAN1700081
All music above licensed under Creative Commons: By Attribution 3.0 License
creativecommons.org/licenses/b...
Time code: 7:00
Mix of two tracks:
1) The Shimmering by fran_ky (freesound.org/s/237363)
Licensed under Creative Commons 0 license
2) "Spacial Harvest" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
creativecommons.org/licenses/b...
ISRC: USUAN1100653
#UVC #GTL3 #Brainiac75

[@SeanBZA]

I actually met those a long time ago, as they have been used at least since WWII as map lights on aircraft, with the tube having a phosphor coating to create white light, then a switchable filter, so that you can either filter out all but the red phosphor emission, to keep night vision, or have some of the UV light bleed out as well, to illuminate maps that have invisible ink marking on them, put there so that if they were discovered there would be no intelligence immediately visible. Run off the 28V DC bus using a pair of resistors, and then a variable resistor that functioned both as power switch and display brightness control in the feed to the lamp. IIRC 27R 15W main resistor, then a 60R 5W resistor across the lamp to limit the voltage when the main filament went open, so it would not self light, and then a 20R 20W wirewound brightness control with a switch. Switch and brightness control on the lamp itself, on the end of a curly cable so you could use it close to the map. Resistor mounted at the other end, providing a bit of heat extra to the cockpit all the time, and not noticed in the other power draws off the battery when the aircraft is on.

[@Ramog1000]

hm the invisible ink only sounds like a deterrent for people who don't know what they searching for/looking at. For people that aren't even there on purpose or something and just took a wrong turn xD

[@Connie_cpu]

@@Ramog1000 Crash wreckage would most likely be found by low level infantry and they wouldn't call in an intelligence officer to the scene if it didn't look like there was anything useful

[@TaroutCommodore]

The level of detail in your reply is astonishing and great to read, you sir are a legend

[@pankajjaiswal6498]

Wow !

[@TrapperAaron]

I question your story because they are not meant to run on D.C. I doubt military is going to use a questionable method to run electronics especially when it's so simple to supply it w a.c.

[@izzieb]

I can't really add anything intelligent, but I always like seeing a notification for a new video from you. Always something interesting and often learn something new.

[@squishybrick]

Intelligence isn't everything, being polite and positive carries just as much value in daily life.

[@ooddrr99hh]

Seeing the graph that shows how much UV-C is produced compared to the visible light is terrifying because I'm a welder and the visible arc alone is blinding. I would love to know how much UV light is produced! I also use roughly 28 volts and 350 amps. A wee bit more than a 3w light bulb!

[@TheRealFlamingNinja]

"Effective irradiances observed at distances of 500 mm from the arc were in the range 0.045-2.2 mW/cm2. At these irradiances, the allowable daily exposure times are just 1.4-67 seconds, which are extremely small compared to the cumulative exposure time over the course of a single day, indicating that direct exposure to UVR emitted during arc welding of cast iron is quite hazardous. Therefore, if workers engage in arc welding of cast iron without taking appropriate protective measures, even short-time welding will result in exposure to dangerous amounts of UVR." -Comprehensive analysis of hazard of ultraviolet radiation emitted during arc welding of cast iron, Journal of Occupational Health Volume 62, Issue 1 Jyunya Takahashi, Hitoshi Nakashima, Nobuyuki Fujii, Tsutomu Okuno 03 December 2019

[@ooddrr99hh]

@@TheRealFlamingNinja interesting read! Strange material to choose though, cast iron isn't easily weldable. A lot of welders I bet go way over the limit of exposure too

[@TheRealFlamingNinja]

@@ooddrr99hh I think pure iron is used as it's a sort of "best-case", the authors go in to detail about which fillers emit the most UV and it seems the closer to pure iron the fillers are the lower the emissions. Possibly also just for the sake of clarity too, steel != steel.

[@phizc]

@@TheRealFlamingNinja cast iron is a bit of a misnomer. It contains a lot of carbon, but I'm not sure 2 batches have the same amount. Much more than carbon steel. That said, as you say, steel comes in many flavors as well.

[@nutzeeer]

the uv light might destroy fridge plastics!

[@sulfie46]

Super informative and intriguing video! Watching the lamp switch the light emitting filling was incredible!

[@brainiac75]

Glad you like it, sulfie! I bought the 230V version just to document the flickering :D Thanks for the early watch.

[@poorlydrawnstickman1660]

I love the scientific approach and the confirmation of your guesses in all of your videos! Keep it up, can't wait for your next video!

[@jasonenns5076]

Interesting video. You did an excellent job as always! Keep doing the good work!

[@chrisdickens4862]

Fascinating to see the ratio of UVC produced vs visible light.

[@jeepsblackpowderandlights4305]

Mercury vapor bulb been around for 100 years nothing special here.

[@sulfie46]

Good thing my midterm class starts in 10 minutes! So excited for this video!

[@martine-e-dee]

Thank you for unveiling those hidden gems of science for us!

[@jibeji]

I could listen to you for hours! Thanks a lot for this new fascinating video

[@marcfruchtman9473]

Great video. Thanks for making it.

[@justgamingasalways]

Hi really like this video, can’t wait for more

[@ronsku57]

Here again watching amazing/interesting videos! Keep it up!

[@brainiac75]

Thank you very much, Ronsku! Much more to come.

[@lucazsy]

I bought one of those bulbs but never got it running. This video truly helped me. thanks

[@dcallan812]

BigClive has done a few videos on the diffrent UV light bulbs. They do look most odd.

[@brainiac75]

Exactly! I am subscribed to him and he introduced this GTL3 to me :D Thanks for watching.

[@dcallan812]

@@brainiac75 Love the videos. 👍

[@eidodk]

@@brainiac75 3½ years ago. He's got a video explaining it to the utmost electric detail. You're going more chemical on it, which is a very good supplement to his video... You should probably link to his video about the bulb as well, so that it's fully covered.

[@BennyTygohome]

Extremely interesting and very neat design.

[@madbstard1]

I have a few of the 240v bulbs....well, kinda similar to these. Used to use them for a quick sterilization of repaired computer equipment. But always used them with wifi plugs cos thanks to BigClive, I know that UVC can be a bit worrying.

[@GeeKayKayGee]

Thank you for creating.

[@cynot71]

I'm a new subscriber and gotta admit your sense of humor kills me! 🤣

[@alzalame]

Kudos , perfect investigation .

[@alangolab6657]

Best of u videos so far most detailed and informative u are much Futher detailed then is needed by casual person I'm sure continue u work and u get just better

[@kakarikiIck]

Omg how dangerous. People don’t care if they sell a load of the bulbs online. Thanks for educating people.

[@maskettaman1488]

Common practice for asians to sell death traps like this without a single care. You can tell from the writing on the bulb that this one's from China, which explains everything.

[@memejeff]

have heard of these, really cool to hear more

[@WaltRBuck]

I liked, but it's hard to sub up, since I've been subbed up for ages. I really love your videos. Straight, to the point, easy to understand, and smart. It's as if you're some kind of ... Brainiac. hehe )

[@n-steam]

I wouldn't call it a hybrid, I'd call it a half-fluorescent. Those long tubes have similar heating elements on either side with small voltage differences, and a large voltage difference between either end. They also contain the same mercury too and emit UVC, you're saved by the phosphor coating that absorbs the UVC and re-emits it as visible light.

[@brainiac75]

Guess it depends on how you look at it. The final output is most similar to a fluorescent tube without the fluorescent coating but they have two filaments. Incandescent only have one - like this 'hybrid' ;) Thanks for the early watch!

[@StormBurnX]

@@brainiac75 long fluorescent tubes have one on each end to help ensure the entire tube is evenly illuminated - since that's not a requirement for these tiny bulbs, calling it a half rather than a hybrid is certainly accurate :) (Otherwise, a normal fluorescent tube would also be called a 'hybrid' by your logic since they have the same startup procedure and components)

[@Kalvinjj]

The normal silica glass itself also absorbs most of the UVC from what I remember, so another layer of protection. You would be getting the tanning UVB tho without the coat. Those UVC lamps from my memory require special glass, quartz one if I'm not wrong.

[@akkudakkupl]

This has nothing to do with fluorescent lamps - it lacks fluorescent coating. It's a UV lamp.

[@Ramog1000]

probably also saved by the glass too, if I remember right normal glass absorbs UV too.

[@pada443]

The music and that slow-mo shot give me vintage sci-fi vibes and I love it.

[@rpavlik1]

You could use a photodiode and an oscilloscope to view the oscillating of the light in the DC version.

[@ProtoMan137]

Depends on the Qrr (reverse recovery charge) of the photodiode but yeah, good idea :D

[@zebo-the-fat]

I run one of these from a 12 volt transformer with a series high wattage resistor to limit the current. Works well for de oderising old walking boots!

[@collectorguy3919]

This nicely demonstrates the very high electrical conductivity of plasma. Always fascinating.

[@KalLanPIDT]

Nice, thanks! I learned something today ^^

[@KekTekDe]

2:35 would be interesting to know if the thermoionic coating is also radioactive (since strontium oxide or barium seem common)

[@SeanBZA]

Probably mild alpha emitter, with a little bit of others from the decay chains, because making a barium/strontium oxide mix that is also other acintide free is pretty hard, so it will be slightly radioactive. Glass will keep it safe though.

[@Scrogan]

You mean from naturally occurring radioisotopes? Might be tough to measure, especially through the glass.

[@deang5622]

@@Scrogan alpha particles certainly would not get through the glass.

[@danwhite3224]

Naturally occurring barium and strontium aren't radioactive. I think you're mixing it up with thorium. Thorium dioxide is also often used in thermionic coatings, however.

[@wimwiddershins]

If UVC was visible to the human eye that lamp would be super bright and painful to look at. Instead, we can happily stare at it while our retina gets a suntan. :/

[@LegendSpecialist]

Great video👌

[@grantrennie]

Thanks for the good video 👍

[@SkyChaserCom]

Cool video. Interesting how the slow motion clearly shows the AC sine wave in alternating brightness :)

[@tinkmarshino]

excellent video!

[@ovalwingnut]

Good show!

[@piconano]

I love your video. Please make more.

[@4ugust0xD]

Awesome video

[@TonnyCassidy]

played around with the same bulb a while ago, that ballast, aside from changing the DC to AC also increases the voltage, the bulb requires about 24v to start heating the filament, the 10v written there is only after it strikes therwise it needed a current limited 24v supply, i managed to power mine off dc PSU with an H-bridge, PSU set to 25v 300mA and with an oscillator to make the H-bridge switch at around 2.3KHz increasing the freq dims the bulb also did a banana test which didnt work for some reason, i did verify the banana test should work if it really produces UVC by doing the same test with philips TUV lamp

[@brainiac75]

Interesting. I haven't tried the banana test myself but certainly an easy DIY test suitable for a video on my channel ;) Maybe it needs the ozone-generating 185 nm UVC to work? I think the one I have only emit the typical 254 nm but 185 nm is blocked by the glass. I smell no ozone from it.

[@TonnyCassidy]

@@brainiac75 www.lighting.philips.com/api/assets/v1/file/PhilipsLighting/content/fp927903404007-pss-global/ADAM-20151211161941374%40en_AA.pdf this is the other lamp i use, the datasheet seems to indicate that this is also 254nm so im not too sure what is going on here, did test with both lamp for like 10 minutes eachtwo of that small bulb did very little to the banana peel, while the philips makes drastic change

[@brys555]

@@brainiac75 I got those bulbs from China few years ago. They would let you choose between versions with or without ozone generation blocking coating.

[@petevenuti7355]

​@@brys555may I ask how to order and what's the comparitive cost? Is it as cheap as it is built cheaply?

[@JustPyroYT]

Very cool and interesting video👍👍 Keep it up, your videos are sooooooooo good👍

[@brainiac75]

Thank you very much, JustPyro. Much more to come :D

[@WalterBurton]

"HAH-OY!" Love it. "Hi" back at ya from Virginia, USA. Your videos are a delightfully quiet and colorful escape from, well, pick your apocalypse. :-)

[@garygough6905]

Twice the value of ballast cap works for 120 VAC . Related accident. I have a old incandescent bulb that radiates 70 MHz pulses when on. My guess is the folded filament self resonance is about 70 MHz, the bulb may be gassy and the filament ends and support wires are alternating forward biased diodes ( noise emitting).

[@brainiac75]

Haha, that's an odd incandescent bulb. Haven't heard of that before :) Thanks for watching!

[@YSPACElabs]

70 MHz (megahertz) is a very high frequency to be radiated by an incandescent bulb (never even heard of high frequency RF being emitted by an incandescent bulb). But this might be in the realm of RF weirdness that I have no idea about

[@garygough6905]

@@YSPACElabs surprised me too. Was seeing hum bars on analog TV channel 4, that just seemed to come and go at random, but mostly at night. Was just luck that the TV was on when I switched the light on. Put the bulb into a desk lamp and it was still radiating RF when on. Folded filament clear antique style.

[@YSPACElabs]

@@garygough6905 probably RF weirdness with some sort of parasitic components. Probably has to do with the parasitic inductance and capacitance that form an lc tank, that is somehow fed by 60hz AC. But I would think the resistance of the filament would dampen the wave quickly. Also, if my theory were correct, all incandescent bulbs would radiate high frequency rf.

[@garygough6905]

@@YSPACElabs Yes. While , most of the time, parts are treated as purely resistance, inductance, capacitance in reality everything has a value in all characteristics. Two parallel wires are capacitively coupled, both are inductors and as it is distributed over the length shows a characteristic resistance ( impedance ). Early radio operators, ( 1920s ) would have been very familiar with a coil of wire having a resonant frequency. Adding a seperate capacitor did lower that and at the same time narrow the response. Every diode is a noise source. Every junction between two different metals is a diode. In early tubes a single resistive wire was both the filament and the cathode, so the tubes gain varied across the length of the tube as the filament was also a voltage divider for the filament heating power, but also the cathode voltage at any point was the sum of the intended cathode voltage and the ( much lower ) filament voltage. Actually everything in a tube interacts with everything else, they are fun to play with. So add an indirectly heated cathode to correct that issue , then there is the capacitive coupling between the anode and the control grid, add a suppressor grid. Then a screen grid. Ah well, misspent youth. Anyhow back to the weirdness at hand. The bulb has filament supports about 1.5 inches apart with the filament zigzagging between the power leads and upper and lower supports several times. So several inches and probably enough inductance and capacitance to actually have a resonant frequency. A normal bulb with a short filament isn't going to be much off of a pure resistance ( have seen them used as dummy loads for lower frequency transmitters ). This thing was a warm glow, decorative bulb. I'm 600 km away from where it is, so no pictures right now. Just a curiosity anyhow.

[@Diacrusher]

I don't watch that many big clive videos and actually didn't watch you video until now, because I thought it was his xD funny, that you bring him up

[@WalterBurton]

"I don't have a Phantom hi-speed slo-mo camera at hand, so I'll just fire up my optical spectrometer here and take a look, if that's OK with you." 🤣🤣🤣

[@nerfinator03]

That was a major flex if I've ever seen one.

[@mickeyfilmer5551]

Really interesting -I just enjoy these types of videos - I am also a subscribers to Big Clive (and aVe, electroboom and many others ) thanks Braniac75

[@AlexanderBukh]

One of us!

[@jesscorbin5981]

Thanks!

[@Kepler_2258]

I actually pulled one of those lamps/ballasts (the ballast was bigger and a bare pcb with a beefy cap) from a old air purifier that I bought at goodwill for like 3$ lol, it’s a very nice little Uv Lamp, although it Doesn’t compare to my 2x 30w UVC Water purification Lamps I tore out of a water purifier for a washing machine (that yes I got at goodwill for like 5$ xD)

[@photonik-luminescence]

Cool video. Reminds me of a self ballasted mercury vapour bulb. Only that, its a little bit different.

[@gusbailey68]

Already subscribed, but this was great.

[@AveriV1]

such a pretty bulb

[@bob_mosavo]

Thanks 😁

[@tomdavidson9067]

Any day I get a notification for one of your videos @Brainiac75 it brightens my day and I think, "Oooo, wonder what cool thing this one is about". I have a scientific background but have learnt so much new stuff from your videos, many thanks! 👍

[@brainiac75]

Glad you like my videos, Tom! Much more to come - I learn from researching for the videos too :)

[@namshimaru]

I subscribed to this channel a decade ago? it's still good.

[@EduardRitok]

Something makes me wanna buy this lil bulb 😁

[@norbertk.1473]

Sehr gut erklärt👍 I have abonniert.

[@mindless4426]

very nice

[@Boogie_the_cat]

That is a beautiful slow motion scene of the light kicking on. If you don't mind, I am curious as to how many frames per second it was recorded at. I am a lighting enthusiast, and naturally curious. Thank you

[@cassini-studios88]

Nice!

[@pineappleroad]

The thing with the capacitor reminded me of the powerline adapters we had, one of them got blown up during a thunderstorm, along with the router it was plugged into (the router was connected to the phone line via a filter, somehow the filter survived) At one point i unplugged the powerline adapter, and one of my fingers came into contact with the pins when i was holding it, and i got a slight zap (I did check the one that was still working, and that one did not give me a zap when i put my finger across the pins after unplugging it)

[@mernok2001]

That adapter could be very dangerous.It could have a capacitive dropper with no galvanic separation.

[@user255]

04:59 That sucks. I still remember what 310v from full 3µF capacitor felt. That can be even worse.

[@georgkrahl56]

Most likely you have been killed and defibrillated by a single shot/shock.

[@user255]

@@georgkrahl56 It doesn't work like that. But maybe I missed a beat.

[@georgkrahl56]

@@user255: This was a joke. Meaning, be happy that you did survive it. We have had a severe electrical accident at the U of Berne with a flash-lamp pumped dye laser. The capacitor was (physically, not by uF) much larger, but charged to 20 kV. We could not determine how the PhD student managed to open the steel doors, defeat all interlocks and did come to the insane idea to use a standard multimeter to contact the porcelain insulators. The student was found lying in the corridor outside of the lab. He somehow did survive it, but his ECG is permanently abnormal now. Our professor had the guts to bring the multimeter to the repair shop. Answer (looking at the shattered smoking remains in the enclosure) was something like "I fear we cannot do anything".

[@SpartanGuy]

Is there a way to visibly show the extent of how bright/powerful the UVC emitted is? Like comparing it to a lower wattage UVC source on something that reacts to UVC like on certain rocks/minerals? Maybe at difference distances?

[@TonnyCassidy]

not scientific but.... banana peel test

[@SeanBZA]

@@TonnyCassidy 10W, so likely half the power goes into parasitic loss in the uncoated length of the filament, so 5W of actual energy in the glow discharge, which pretty much makes it about a third the output as a T8 12in UVC quartz linear lamp. Roughly the same losses in there, and that is 18W, and the linear tube has a bit more loss, because of the long spacing of the electrodes. But concentrated into a really tiny area, almost a point source, so will be much more effective at close range.

[@Midaspl]

I mean, you can use the spectrometer footage and use ratio to visualise how bright it is. Not the best method, but could give the sennse of scale. There are 4 peaks of visible light there that are 20, 8, 32 and 14 pixels high, so combined they'd be around 74 pixels. The UVC peak is 813 pixels high, so the invisible UVC is around 11 times brighter than what we see on the video and considering the camera catches it in the daylight in some shots, it's bright AF.

[@mfbfreak]

Yes. You can take the phosphors from a broken fluorescent lamp, and coat the UVC lamp with it. It will light up brightly. I already made a little prototype, when i have a 'nicer' version i will make a video about it and post it on my channel. The UVC light does not do much with phosphors typically used with UVA/blacklight - those don't respond well to the short wavelenght UVC.

[@Joshinken]

Bro I thought the video was over when you showed your patreon and was gonna look for a part 2 where you look at the spectrometer output

[@Ninjahat]

Tak 🙂 Du har en god teknisk forståelse 👍🏻

[@AchievedZeus574]

I liked all the clicks at the end lol

[@bestintros6868]

After 3 years new video : )

[@brainiac75]

*1 month... ;) Thanks for the early watch!

[@RooMan93]

It would be interesting to see how a phosphorescent substance reacts compared to a uv led or a laser or something

[@deang5622]

Phosphorescent coatings glow in the presence of UV. Thermionic coatings, probably not.

[@DavidKennyNZL]

Intresting

[@jed-henrywitkowski6470]

That's such a pretty blue.

[@ravanabrahmarakshas4263]

great leason. well prepared. well presented. you uncovered secrets of this odd design uvc lamp. what was that plate doing there?

[@brainiac75]

Thanks! I don't know the purpose of the plate. Some speculate it is a reservoir of amalgam/mercury to keep the mercury vapor steady?

[@cyfralcoot65]

Hi, have you heard about switchable neodymium magnets? I recently built one, its working and its super cool. Would be nice if you make a video about various designs of these

[@Rvw1408]

Did you make a video?

[@alunroberts1439]

I must buy some.

[@auntied4950]

Brilliant video as always!

[@brainiac75]

Glad you like it, Auntie D! And thanks for the early watch and comment. Means a lot.

[@flaplaya]

I seem to remember Thorium and Cerium Oxide being emitters. Radioactive too, no gamma though.. Very nicely done the slow motion was amazing and acurate.. The cathode does all the "work" in these and little neon lamps. I wonder if HID lamps oscillate like this too?

[@BH4x0r]

Thorium actually has many uses, Thoriated welding rods, mantles for gas and other flame lamps, filaments in discharge tubes, and it goes on lol

[@mookinbabysealfurmittens]

Yeah, that weird powder finish on the filaments made me think of those old (still used) thorium mantles for some kerosene & petrol lamps (c/o Technology Connections - love him and Big Clive!).

[@SuperBrainAK]

Those are cool! I should set one up in my air duct, I bet I could make one of those royer oscillators, also know as a ZVS I've done that a few times with CRT TV flyback transformers. Thanks for the video!

[@acpineda7263]

Brainiac that is maniac

[@crckdns]

that's interesting! never have seen those lamps! could you maybe...make a short video with closed apterture.. so it's not that bright and we can see the actual spot the gas is hot at?

[@Hue_Sam]

4:41 Brainiac becomes ElectroBoom

[@paulstubbs7678]

Interesting lamp, it's basically a fluorescent tube shortened as much as possible, to the point where the two end filaments now share a common connection. I hope these kits come with a lot of UVC warnings. As for the AC version, Isn't that a US style 120V plug? - it has no place is a 230V environment - so doubly bad!

[@fluffball1415]

US plugs have holes, that's a Chinese plug, same thing pretty much but uses 230V I think? Been a while since I've read into it.

[@tz8785]

@@fluffball1415 In the US standard the holes are specified but optional.

[@onradioactivewaves]

The plug itself may be an arc hazard, but typically only the cheapest of plug/cords are not rated for 300VAC ( from my experience) and I've used them extensively at 277 without ever having an issue ( lab enviornment where it was legal of course)

[@michael1234252]

This type of lamp is one of those odd electronic devices that BigClive would make a video about.

[@edgarlatulip4820]

i have found similar lamps in some cloths dryers and ozone converters.........only they used an inductive ballast, and yes, these bulbs can convert a good deal of ozone if you're not careful with them. as to that coating.........most likely it is ZnO, it's also used on the filaments of vacuum tubes.

[@colinofay7237]

I'd love to see that graph compared with sunlight!

[@DyslexicAnaboko]

I want big Clive to do a tear down on this

[@adamaglionby7438]

Mercury Blended Tungsten Fluorescent, MBTF, 160/250W sort of size, used to be used as high bay, warehouse, lights and in a blacklight version. Tungsten filament acts as ballast for Mercury arc tube in big envelope, no external ballast.

[@TheSly1987]

Какая простая и эффективная конструкция.

[@iamdarkyoshi]

I'd be very curious to see the current draw waveforms on the capacitive dropper circuit. I'd imagine every time the discharge strikes and clamps the voltage, there'd be a spike in the current. Not sure though, gonna have to see it tested. Might pick up one of these spicy UVC lamps and give it a shot

[@mudmagnet3249]

What will you use it for ?

[@deang5622]

The voltage across the electrodes is changing, so as it drops below the threshold voltage, the electric field strength isn't high enough to cause the ionisation of the gas, so yes, I would expect current spikes too when the gas breaks down. But I suspect the thermionic coating will lower that threshold voltage significantly, than without it. So conduction is likely to occur for much of the input signal cycle.

[@theanti-ledguy9052]

These lightbulbs are also used in air purifiers being a cheap way to have uvc disinfection, some purifier use a proper ballast and some use a capacitor and a fuse, I think that it is quite neat however I’m not sure about how long they last.

[@alxndrtankov2500]

Bravo

[@WobuVid]

NICE

[@TheRailroad99]

bigclive also made a vid about these lamps

[@markaz2kk]

I just bought a bucket load of these lights.

[@DusKinggoGames]

4:55 "You'll only do that once." I know an Iranian guy who did that more than once.

[@subliminalvibes]

Wow! This is so cool. I wonder if you received any x-rays during ballast start-up... 🤔

[@brainiac75]

Max voltage is a little over 300V so the electrons are not energetic enough to cause X-rays. And I believe the bulb does not have enough vacuum to get the electrons into high enough speed for X-rays. I am pretty sure I wasn't exposed to X-rays - just short bursts of UVC which is bad enough :| Thanks for watching!

[@Funkylogic]

Possibly Mercuric trioxide there is also a Thorium dioxide type as well but as far as i am aware that's almost only seen in the specimen end of a mass spec flight tube these days.

[@A_Tempest]

over 7000 people have made you day, must be a really great day!

[@defenestratorr]

2:03 OG Xbox turning on lmao

[@MeixnerQuest]

Mercury gases and UV radiation are definitly something I don't what to be around.

[@jeepsblackpowderandlights4305]

Oh please.. Mercury vapor light have been around for 100 years... They just use a special glass to block the uv to make it safe. The frosted coatings on later versions convert the uv into red light to make the bulb white in color versus green. Welding puts out uvc radiation.. it wont kill you or give you cancer. Just dont look at it hah. The burns from uvc on the skin isnt that bad either.. a minor sunburn.

[@joerivanlier1180]

Never seen any of your videos but this was great. Btw is that spectrometer corrected for energy output to black body or just to raw power? Because UVC is tremendously powerful so at the same eegh foton voltage or something? It'll put out a lot more power due to its insane frequency...

[@deang5622]

Power and energy are not the same. The energy is related to frequency. The energy level of each photon emitted is high because of that.

[@rpavlik1]

I mean, it's more like a self starting fluorescent. Big Clive has some videos on these bulbs. I got one in an electric toothbrush kit in a "sanitizing" compartment for the brush heads. But the bulbs themselves are fairly widely used I guess. They are kind of weird how easy they are to drive. (Edit: ah you mentioned big Clive 😁). Iirc, the bulb is actually quartz, not regular glass.

[@hillaryclinton2415]

Yes, because quartz glass is transparent to uv

[@kenneth6731]

I am curious as to how much the resistance of the filament changes before, during and after full excitation?