Amazing ten-volt mercury discharge UVC lamp. (GTL3)
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- Опубліковано 3 жов 2024
- I thought it was maybe a listing error, but this little lamp really does run at about 10V when it's warmed up. It uses an internal filament with a thermally emmissive coating to lower the voltage at which a mercury discharge can occur.
Remember that this lamp puts out UVC light which can cause skin and eye damage by direct exposure.
Here's a generic eBay search link:-
www.ebay.co.uk...
Russell's page:-
russellsrandomt...
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.co...
This also keeps the channel independent of UA-cam's advertising algorithms allowing it to be a bit more dangerous and naughty.
Very noble to take care of your mum!
Clive now has the distinction of being the only guy on the Isle of Man with sunburnt fingertips.
Hang on...like isle of man...there they hold Isle of man TT?
The very same.
Nah, I keep a 22w or something close on in the crapper, as long as you keep your eyes shut whilst you piss you can make it out with just a tan after a week. Just keep the window open and the door shut when its on, all good. Not for public consumption...
@@TotesCray Oh damn....surley he goes and watches it...fun for anyone...motorbikes at upwards of 300km/h
@@unclejohn5012 He watches it on TV, its waste of time to watch people whizz past and not know where they are in the event, it's a time trial not a race.
As a watcher of the bro from canaderp, can confirm, its an audio triggered focus.
Cool! I used to collect discharge lamps. I've still got a couple of GEC self-ballasted mercury vapour lamps installed on the sides of the house which have outlived every LED floodlight that my neighbours have had.
A lot of people seem to collect discharge lamps. They are quite intriguing.
Plus it kinda reminds me of the street lamps on my Mother's street when I was growing up. LED street lamps are close, but not quite.
My Grandpa had a 110VAC Mercury Arc discharge lamp in his home for living room lighting. Seemed self-ballasted, may have had a dry capacitor in the base, but it seemed very nice as a design. Wish they still made stuff like that.
Normally used on a 28V supply via a sodding big 27R resistor, to provide the ballast resistance. There is also a 82R resistor across the lamp in this application. This is used as a illuminator for aircraft instruments that is not visible to the human eye, yet provides a bright phosphor display on the dials, with a very dark UV pass filter ( Woods glass) to keep the UV level to a safe level. Used to be a part of older aircraft where you had to read regular instruments during night flight yet keep your dark adapted vision for navigation and flight.
Thank you for that info!
I kept wondering, "how and where would such a tiny amount of UVC be useful?" Not in many germicidal applications, except maybe _very_ small enclosed spaces. Possibly in a industrial paint/coating cure process (?), but then again, you'd probably use a much more 'standard' size lamp there, otherwise you'd need a lot of these in a panel arrangement.
@@SigEpBlue my philips ultrasonic toothbrush base station uses one for "sterelising" the brush heads
Rick Delair 120V/6W would be 50mA, if it was half brightness, the thing probably not more than 30mA. Enough for a nasty shock (as you wrote) but far away from "deadly". I would expect, that this device has some constant current characteristics, like a bicycle dynamo. Higher rpm -> higher voltage, but higher (internal) frequency also, so with it's inductivity the max current stays roughly the same.
lol you are a light bulb collector? i collect electrical switches xD
+SeanBZA I bet you love to explain in pubs why aircraft power systems are so different from 12/24v car/truck supplies and also where the 400Hz AC tradition comes from :)
I certainly do anways hahaha
Ahh. I've always wanted to see one of these in action since reading about them in the past.
I never understood how a gaseous discharge could be sustained with only a 10v supply.
Time to grab a beer, and learn something new. Good choice of topic, Clive.
Remember that stick welders operate at a low voltage and strike an arc.
Clive drops the F-bomb 2 minutes 29 seconds. That's how you know it's going to be a good video
I'm not sure about discharge stuff, but most ionic things happen at low voltage, like battery cells, electrolysis etc. More current is more electrons per seconds. So say you only need a certain amount of electrons present for a reaction to take place (or coming out as a result of a reaction), then the more you can pump through per second (current) the more "result" you're going to get (until it is no longer possible). If you have more electrons present than you need in an instance (high voltage) then it is just inefficient and will probably have other negative effects, like heating, or exploding.
@@laminatedsamurai F-bomb? What the fuck is an F-bomb??
Once the path is ionized, the voltage is low. It's getting the arc struck that takes high voltage. In this case, it's the filament with the coating that does the job.
Clive,
Every one of your videos that I've seen so far has been both hysterical and SERIOUSLY informative! Thanks for making these and I hope you continue for a very long time.
Cheers!
I'm reminded of the time, many many years ago, when I was pulling bits out of a scrapped washing machine and ended up with something that was labeled as being a "germicidal lamp", the socket, and an inductive ballast that went with it. Applying line voltage to this did get it to light up, and I don't think that I did too much damage at the time.
I wonder if that would work for combining hydrogen and chlorine to make hydrochloric acid.
Hello Cody!
I got my hands on UVC leds and i guess it's possible. I read on sciencemadness people were doing it with halogen lamps due to the UV traces ot emits
Hi Cody!
No need for UVC, hydrogen reacts vigorously with chlorine, the reaction would be highly exothermic with a self -sustaining flame. all you need is a gas regulator valve and a match to initiate the reaction
I would expect the reaction to be explosive.
I have an old refrigerator that uses this lamp. It took me a while to figure it out, because the bulb was missing. Apparently, the 'Magic Ray' lamp used UV and ozone to prevent foods' flavors from mixing in the refrigerator (think before tupperware and ziplocks existed). I was able to find the bulb a while back, but I have no way of testing it, because it's wired in series with the condensate heater - which is also missing. I wondered why they would wire in series, but now I know - it's 10 volts (ish). Apparently they must've used the resistance of the heater as the ballast for the bulb. Interestingly, if the bulb ever burned out, or you just removed it, the fridge would have no way of evaporating the condensate water, and it would just pour out onto the kitchen floor!
But hey, instead of resistors, couldn't you just use a choke coil for a ballast? I wonder how an appliance (humidifiers, apparently? O_o) would be wired to power this bulb.
Oh yeah, so good to have you back at your bench. All the bits to hand. The soothing tones recorded by the mic.
E16 fittings are incredibly rare. There is one ancient porcelain fuse size that uses it (Siemens Diazed/NDz/… DL E16), and some sewing machines, microwave ovens, and refrigerators seem to favour them for illumination. For the latter ones, I've only ever seen the lamps, but short of going out and ripping one out of a used appliance, the fittings themselves so far have eluded me.
When I used some lamps which were about this size, I ended up cannibalizing a replacement strand of old fashioned screw in christmas lights. They worked for my UVC lamps, but those were technically E17, so they might be too large for the E16s.
Back around 1982 I needed an EPROM eraser. I found the last clothes dryer germicidal lamp in the city. A 40 watt incandescent lamp in series worked really well to limit the current. Mounted the UV lamp inside a coffee can and erased EROMS in about 20 minutes.
You mean clothes dryers had germicidal lamps in them back then ? 🤔
I must admit I have never seen any so far...
As Bernd says, power was one issue for mirrorless vs. DSLR - an issue in the field or on longer shoots. Another was viewfinder lag, until recently. Also, autofocus. Sensors now have phase-detect AF on the image sensor whereas before it was (or is, in a DSLR) a separate sensor in the bottom of the camera. Straight contrast AF through a normal image sensor can give good results but needs abundant light, and can get confused more easily.
FWIW: I just realized I have been 'permanently corrupted' by modern _internet-speak._ You said _"AF"_ to mean _"autofocus,"_ but my first thought is to read _"AS F*CK."_
😊😊😊
Sold before end of video.
Ordered 10 from Big Rock Candy Mountain for same cost as UK seller.
Might be good to power from solar cell for keeping water fresh after the apocalypse.
Or disinfect a n95 mask
So, with the lamps on your desk now, were you also able to find E16 sockets?
So, with the lamps on your desk now, were you also able to find E16 sockets?
@@Anvilshock No. I just soldered them.
My dad has gotten addicted to your videos too!
Now we sit in the theatre room together and watch them on the big tv
P.S
Try a Hasselblad H6. I use one and I love it.
Costs you an arm and a leg, though.
Wouldn't Clive rather have a new car instead of an overkill camera?
i tought it was a lightbulb... seriously
Clive, this is a "blacklight" to some degree. At least, I know certain minerals will react to UV light. But it depends on the wavelength. Some react to UVA, others UVB, or UVC.
If you ever come to the USA, check out a cool mining museum called "Sterling Hill Mines" in northern New Jersey. They have found a large collection of fluorescent minerals. It was accidentally found in the zinc mine one day, when the power lines shorted out, and the arc flash created UV light. The walls of the mine tunnel glowed a pinkish red!
"it's more dangerous in this area", he says, stroking it with his fingers
To be fair, being more dangerous than 10V on dry fingers is not that hard
"Do remember it is UV-C so I shouldn't be too close with my fingers."
*zooms out and keeps his fingers close*
are we still talking about the lamp
pkunkbwok 😂
I have one of these "intermediate base" (a common size for reading lamps in the USA) germicidal lamps socked away, but I also got (in an estate sale) a 275-watt combination mercury-vapour/incandescent "sun lamp" from the 1950s, which screws into a standard socket & goes right across the 115-volt mains supply. Of course you want to use a ceramic socket for that! I don't know any good use for it other than discouraging the mold in the bathtub, but it's a real champ at that.
SAFETY SQUINTS ENGAGE
Welcome home Cline, glad to see the old bench.
Nifty little light.
Yay, your back at your home bench! So glad. Back to normal videos again. Hope the new camera will work out.
These bulbs do emit a strong ozone smell. I used four in a Styrofoam "sanitization box" with E-17 "patio light" sockets powered by 18VAC and capacitor ballasts, on a delayed start 5 minute timer. I read a number of UVC warnings and have never seen the direct illumination - just the purple glow through the Styrofoam. Russell's page was invaluable. I used AC to balance the wear of the electrodes. Thanks for the video!
You can get two types. Both emit UV but one is optimised to create ozone.
The square plate acts as an anode. Its tapped at the midpoint of the filament, so it will always be ~ 0V. The ends of the filaments (tied to each terminal) will follow the AC input 180 degrees out of phase of each other. The one that's in its negative half of the cycle, will be the cathode, and there will be a thermo-emissive (sp ?) current path between that cathode, and the plate. That path, thru the mercury vapor, excites it and emits UV light.
why does the glow happen only around the anode then?
They look and sound just fine, great to see the old bench back!
The advantage of a DSLR with a viewfinder you put your eye to, versus a camera with a screen at the back is that with the viewfinder you can block out the light when you shoot in daylight. It can be hard to see what's going on at a screen.
Well, if you have a camera where you look at a display through a "viewfinder-hole", you get that advantage too without a flipping mirror. I don't know if cameras work like that nowadays, have only used a phone-cam the last decade.
I agree, viewfinder much better. Some mirrorless do have digital viewfinders. Still prefer optical though.
The problem with the viewfinder-hole is that it doesn't show you what the lens is actually seeing due to parallax. All of these viewfinder methods have their place though. Some are just more appropriate for some applications than others.
We have those, and they're aptly called Electronic Viewfinders :)
Have you seen James Hooker's website Clive? Thorn and Osram made similar lamps, some with a woods glass envelope. They were used on 28v supplies to illuminate cockpit instruments painted with UV reactive paint. Thermionic discharge lamps have been around for a long time. In the USA a large version was offered as a sun lamp. These sort of lamps are very commonly used in small UVC filters for aquaria and also in air purifiers.
Ok, so i was drinking my tea when you said "focus you fuck" now i have to clean up, as it's now all over my desk xD
I just received same product, but it was sold as 220v. And you were spot on! they both produced quite a bright but really short flash. They also reliably triggered BOTH segment and entire apartment breakers! I guess time for an ebay claim... Thanks for great content!
That is digital zoom for you. Zooms in a lot at the expense of quality. Optical zoom is the only way to go.
not likely in a cell phone though,
Years ago, when VHS camcorders were all the rage, they generally came with (typically) 8x optical zoom. We tried an experiment and mounted a 50x pair of binoculars (only one side) onto the end of the lens. It wasn't easy to do and the picture stability was hard to maintain but that gave us 400x zoom. We got some amazing video of the moon as it literally zoomed past.
@@ruakij6452 I've got one of those. Probably overkill for over the shoulder YT vids, also has no external audio input if that matters. But yeah, excellent video stabilisation at near max zoom. Can literally shoot the moon hand held.
I see that UV C has several uses in dentistry. Regards Graham (G3ZVT)
The moon zoomed past ?? What were u smoking in those days ???
Good coverage of a very interesting lamp! I've powered mine with an electronic fluorescent lamp ballast that has a 600V OCV and 0.2A lamp current. Works great.
Emissious is a perfectly cromulent word!
An emissious filament embiggens the smallest lamp.
Personally, I find it anaspeptic, frasmotic and even downright compunctuous to cause such pericombobulation.
Who do you think you are, Leonard Sachs. (The Good Old Days)
These are also used in some electric toothbrush recharging stations for sanitizing toothbrush heads.
I've found a high frequency in a tilt switch produces a neat effect, little uv line, looks like when a rocket fires, only in eye scorching blue/violet
Completely forgotten about those tilt switches. We used them at Honeywell on the DHU1214 document handlers (reader/sorters) DHU1214's in the early 70's to detect when the "pocket" was nearly full and the feeder motor was turned off and a red LED would light. The magnetic rod on the flap would get covered with staples, pins and other debris so we upgraded to microswitches. The ones with the "arm" and the "wheel" on the end. 😆
Built it thanks. Used 24v/1A tran 2x82R. Didn't measure anything. Works great.
I have just done the same and am bench testing - safely! How long does the thing last, as I want to sanitise water and it will be running 24/7?
So when you discussed the spatter effect I knew exactly what you were talking about because I learned that on your channel. That is why I'm a patreon.
*sputter/sputtering.
wikidiff.com/spatter/sputter
Scroll down a bit the words will be side by each.
+Raymond - good resource page. The definitions for 'sputter' we want are the ones with (physics) at the beginning of the definition, at the very bottom of the column, since we're talking about atoms of a solid being ejected and deposited. (Note that there is no such listing for 'spatter,' which is why 'sputter' is the correct word for this situation.) I've not used wikidiff before, but it looks useful - thanks.
My main camera is a Fuji X-T1. Takes fantastic photos. Recently sold my right leg and kidney to get the 80mm macro lens for it. A perchise I am very happy with.
I watch a lot of your video. I did buy the exacte same lamp and I spend a evening finding the good ballast resistor for the transformer I have. That 3 week ago. Tonight browsing YT I find this video where you explain me that I lost a evening because you end up with the exact same solution I end up with ,thanks . I also agree that a capacitor dropper is a bad idea. Inductor will work but a transformer with a resistor ballast is much simpler.
Every time I hear "Enhance" on film and TV I am now going to hear Clive say "Zoom in far too much!"
Actually, it seems the filament is only HALF coated! Seems that it is part of how it operates. Neat little device. Keep up the good work, Clive.
The camera aficionados are wondering why you only spent 120 quid on a phone when you could have spent easily £950
£950???
Amateurs!
:)
Thanks for all the stories you told us when we were exploring the Lake of Nine in our little boat. I liked the one about that time Skadi and Fenrir took apart a cheap Chinese LED lightbulb the best. -Kratos
Big Clive shout out to AvE!
Big Clive, just a quick thank you for sharing all of this with us.
Inspirational.
After all your coverage of the UVC lamps. I have to get some just to smell the "smell".
These little ones have no detectable ozone smell.
I bought one of these bulbs a few years ago and it is a powerful ozone emitter.
I didn't get ozone from this one, but there are listings that offer the choice of ozone or not suggesting filtering of the wavelength in the glass.
mirrored camera's. Massively increased battery life if you don't use the screen, and a much clearer image, allowing you to focus better
Yesterday i found exactly this UVC-Lamp in a Philips Supersonic toothbrush chargingstation, i immediately hat to think of your video and kept it, i think i'll make a mobile water steriliser out of it
Melanoma and cataracts for everybody!
PARTY!
I put my UV safetys on as soon as I saw the title.
Hello , BigClive. Very nice presentation re: the GTL3 low voltage discharge lamp. The construction of the lamp is not new, however. Back in the late 50's, refrigerators had ozone-producing mercury bulbs in them to reduce odors in the 'fridge. The lamps ran off the 120VAC mains, with a series ballast to limit the current when the arc struck. The lamps had almost perfectly spherical bulbs, made of quartz (to permit the ozone-generating lamp radiation to pass through the bulb). The lamps were made by GE, and the packaging was marked "OZONE LAMP", with an appropriate warning about the rays. The package also warned of needing a ballast, lest the lamp shatter. The bulbs were 1.34" (34 mm) in diameter, the base threads had a major diameter of 0.635 (16.2), and were designed not to fit a standard Mazda-based socket, nor the 7 1/2 Watt "Christmas Tree" light sockets. When the bulb is cold, you can see droplets of mercury on the inside of the quartz bulb. The filament is almost identical to the one in your video, including the ends that had the coating. The major difference is that the peak of the filament in your low voltage bulb pointed down toward the base, while the GE bulb's filament pointed away from the base. When the GE bulb was running, the ozone production could not be missed; no need getting your nose next to the bulb! The package further warned that not more than 3 were to be run per 1000 cu ft. Germicidal bulbs are usually designed to block the ozone-generating lamp radiation. Today, one use of the GTL3 is in a toothbrush holder that sanitizes the brush part of an electronic toothbrush.
A mirror camera lasting much longer in battery and the finder is more accurate
TheHirade The SLR mirror can't be used for filming, only for stills.
@John Francis Doe2: False. Most of nowdays cameras can fold up the mirror for video. Then it can be used just like a mirrorless cam. Btw, also for photo shooting if it needs to be silent, eg on a wedding ;)
@dothemathright 11111 : On a SLR with up folded mirror, you see the sceen on the screen, just like on a mirrorless cam. Maybe there's not the same amount of pixel, but who cares, as long as you see the sceen.If you work in a semi or proffessional enviroment, you anyway use external screens, also on the big professional > 50'000 bucks cams.
@dothemathright 11111 : Shooting videos by using The. View. Finder. is nothing I wanna talk about, cause for reasonably good vids you use a stadycam and don't hold the cam in your hands.
Also when you have a full frame body with a large viewfinder it's just more fun actually looking through it. At least for me using an optical viewfinder improves the enjoyment of taking photos.
Thanks for that Clive, most instructive. I've been experimenting with some of these and have managed to destroy 2 so far. Back in the mid 60s I had a little ozone generator using a Philips bulb marked something along the lines of OZ4W. Unfortunately it got broken and I've tried to find a source of them for a long time, it seems that they are no longer made and a recent search found an old stock one for some $100! So I was delighted to find these on Ebay. I tried a capacitive dropper from 110 v not being aware of the 'sputtering problem but like the idea of a 240/24 volt transformer with a resistive dropper. I found that, provided one was happy with a 'unipolar' glow, a 3 - 10 watt, 300 mA LED driver worked well.
GTL3: Grand Theft Lamp 3
The advantage of mirror over mirroless is the viewfinder can see the image in bright sunlight whereas the LCD display will be washed out in bright sunlight. Mirrored cameras have a wider selection of lenses, and mirrorless cameras have a very limited selection and no aftermarket products.
Full frame? Is it a Sony A7III? Panasonic GH5?
As some said, it can't be a mirrorless dSLR, because the mirror part is in SLR. xD
Single Lens Reflex, the reflex comes from the mirror and pentaprism pair.
But people get it.
I'm not totally sure it'll help Clive... you'll definitely get a higher res, more quality in low light, plus a bunch of other capabilities, but at the same time these types of cameras are just harder to handle and to prop up a workflow.
It's always a tradeoff... convenience for potential and quality. The real advantage of pro cameras vs smartphones these days also comes up with extra costs - like buying extra lenses, investing on post production, etc.
It depends on how you shoot, edit and publish your videos... for instance, if you do it all on the smartphone, a pro camera will add extra steps and devices. You need to either shoot, take the memory card out, edit if necessary and then publish on a laptop/desktop, or you need an extra smartphone or tablet to connect to the camera via app and do similar steps.
You could also shoot thethered, which means you'll need to have the camera connected to a desktop or laptop... eliminates the extra step of pulling files from the camera sd card to another device, which is super annoying.
Anyways, the experience will be good for you to decide. Personally, I think the current quality of your videos are already great, no need for gear upgrade. But if the pro camera route doesn't work for you, perhaps a higher end smartphone could also be a good investment... LG V30, Samsung Galaxy Note 9, Google Pixel 2 or the upcoming 3, Huawei P20, those will all offer you a better image quality, manual controls, better low light capability and whatnot.
There are also some better mic solutions coming out for smartphone vlogging from brands like Rode and Shure.
Sony leads the way in autofocus (the internet tells me) and the a6500 is a reasonably boxy camera, also not too big so hopefully not too detrimental to the workflow.
If i guess right do I win an oscilloscope?
For studio work, even a NEX would suffice. Best VFM would be a6000 with kit 18-55. Not old enough, not pricey enough
Oh Clive, you're playing the SLRhut lottery. Good on you.
..."lamp"? Hmmm. "Murder Bulb" sounds so much better...
About UVC production with mercury vapor:
The spectrum of mercury discharge changes with pressure. At low pressure, the hard UVC part responsible for O3 production is much more pronounced than at the high-ish pressures of an Arc like in the video. The range of 160-240 nm can create O3, but the higher wavelengths will destroy them again. Because of this there is a limit for the concentration of O3 that you can reach with any particular UV lamp. (around 1% for lamps designed to produce O3)
So a note, at least on US Spec cameras, digital still cameras are limited to 19:59 on recording video for tax reasons. For shooting continuous hours of footage (or more than 20 minutes) you need a VIDEO camera
I think it's 30 minutes here, but you can use an app to remove that limit.
That's good :)
You can bodge the limit on the firmware, in my case, a Lumix. The file is still split into 4GB chunks for quite a few brands though..
The splitting at 4 GB is due to limitations of the FAT32 file system.
bigclivedotcom I’ve made this mistake with my filming. You can record for longer but you sacrifice the video quality. Only on select few dslr can you flash it to be able to record for longer.
These are tunger lamps. Some dryers use them to make ozone that gets blown into the dryer when running to remove odors. They start out as an incandescent lamp then end up creating a low intensity mercury arc lamp. You can use a 20 to 40w incandescent lamp as a ballast. ❤
EBay search .. 3W Ozone
Jamie Phillips thank you sir
use a 16-18 volt AC and run threw a 39 ohm 5 watt resistor
@@God-CDXX Thanks Jamie! 16V AC, 39 Ohm, 5 Watt........ got it.
I ended up buying a couple of these for experimentation (with sunglasses on of course), as well as a bench power supply.
They seem to start discharge at around 15ish volts, at which point current regulation cuts in, kicking the voltage down to around 10. Exactly as described in this video.
Now my plan is to create a low power ozone generator out of a pringles can, a small PC fan, and one of these.
I have an old 16v transformer laying around, so i'll try to utilize that.
Did yours create a smell of ozone? There seem to be two types, one of which is better suited to ozone generation.
Many sunglasses don't block UV-C radiation (especially if they are made of plastic).
A Panasonix GH5, if so, it is a beast…
Boxy and chunky sounds like a Sony, one of the 6000 or 5000 series with interchangeable lens or the RX series with fixed lens.
Edit: I just saw he said in the comments it's a Sony A6500.
Thanks clive. Now I know why my Toothbrush-cleaner glows in that lovely blue.
Read the manual and wondered if the shield makes it visible and blue. But it's the actual lamp. No wonder they are so fussed with a switch killing the lamp when you open the enclosure. neat and now I know which lamp I need if mine ever breaks down.
Moto is not moto anymore. Lenovo is churning shitty phones with large profit margin...
Xiaomi phones are better, especially with some which have Sony ExmorR sensors.
The Moto brand died after the G4.
Agreed. Fiancé has a G4 Plus, I have a G5; the older phone is much, much better in every way imaginable. Debating whether to go back to (rather overpriced) Sony phones, or to dabble with the Chinese stuff which I don’t quite trust yet.
@@bigclivedotcom
Indeed.
Interesting. I was thinking of going Moto after my S5 gives up but it looks like I may have to do more research. At this point, I think I may just end up buying refurbished S5s for as long as they are compatible with the networks.
I really, really, really don't like Xiaomi. They're the only phone maker I know that's willing to put banner ads in their built in apps, even the Settings app. Extremely dubious.
I have that same lamp mounted in a Phillips electric toothbrush charging station with sanatizing chamber for the brush tip. The holder is more of a clamp you push the bulb in sideways than a threaded mount.
Yes, and the Philips Sonicare unit runs this lamp on DC for some reason. I have one too.
If you don't just shoot static scenery, the mirrorless designs are actually really annoying, because they introduce a few 100ms of lag, which if you started out using a lag-free reflex mirror, is a big enough pain in the ass to constantly work around, that many professionals prefer to stay with the mirror design.
I think I might know which camera you're talking about: is it a Sony?
If it is, just be *really* careful about cheap sellers. I've personally seen some really convincing (in everything but the quality of the delivered image) fake copies of the Japanese DSLRs being sold for just a few grand, so if you find something like that, it's probably going to be a fake.
Maybe depends if they're high end or not. Certainly no serious lag on the a7RIII
@@BillyONeal; Yeah the a7RIII is pretty good in this regard.
There is still some lag, but it's low enough to be fairly easily compensated for.
This will also depend on just how well your brain is able to naturally hide latency through extrapolation.
Even the a7RII's viewfinder was completely useable for me.
Can't be a canon or a nikon cause neither support autofocus on their DSLRs while recording a video. You gotta press a button while recording to tell it to focus. But that might have changed after a few years. I've gone back to using full manual prime lenses for image quality reasons, as well the auto focus takes goddamn ages on cannons.
I don't think any decent DSLR has a 100mS lag. My K-3 can shoot about 9 frames per second, that is 110mS per cycle, but that is not just to raise the mirror and release the shutter - it also includes traversing the shutter to expose the photo, re-arming the shutter while also lowering the mirror and then refocusing before starting the next cycle.
I'm sure that of that whole sequence raising the mirror and releasing the shutter can only be a small fraction of the time taken for that whole process. I am guessing more like 10 to 25mS worst case.
In any case, in my experience the lag is not humanly perceptible - I have never had difficulty capturing brief moments, such as the moment a bird flies off a branch, or a cat pouncing on a toy and things like that. A lag of 100mS would make such shots impossible when added on top of the human reflex time to actually press the shutter button.
What I find ridiculous is using an SLR to shoot exclusively video - the mirror has absolutely no purpose there. Probably people started using SLRs because at some time the Canon and Nikon ones happened to exceed available consumer video cameras in quality but there is no technological reason why they should. Canon and Nikon could easily have repackaged the optics and electronics in a videos camera format getting the same or better quality and also have it in a package more ergonomically suitable for shooting video but for some reason once the trend started it just gathered momentum and kept it.
If it's a Sony, you'll love it to bits
This is a lamp worth revisiting five years later.
It has been revisited after it popped up in a few random products during the pandemic.
It's been so long since we've seen those burn marks. Ah, home sweet home. Also, don't turn that UVC on for too long, you'll get a Donald Trump face tan.
Thanks for the great explanation Clive. I guess Clive has taken out a mortgage for his new camera. I hope he ordered a lens too! I'm drooling in anticpation of seeing explosions in 4K.
Yeah, I ordered a camera and lens kit after discovering that you only get the body for a grand.
You still can't beat an SLR for shooting fast-moving things like wildlife or action sports. They focus faster, and there is very little shutter lag. But for your work, a mirrorless camera is fine.
That's not really true. Take a look at the Sony A9, even my A7 mark iii is ideal for wildlife, and it's an entry level camera - it blows my mind when I use it. And that's coming from a DSLR to mirrorless convert
Bit of a stretch to call an a7rIII "entry level"...
@@OhShitSeriously It's a really quite big stretch :)
Pook365 definitely. But it is their entry level full frame, I haven’t even had a chance to use the A9 but I really do want a go!
There were some clothes dryers in the 1970s that used a lamp very similar to this to make the clothing smell fresh, I remember my grandmother had one a long time ago. Back in the 80s I remember you could get sanitizing toothbrush holders with a lamp like this in them.
Sweet Mary, mother of Jesus!!! A proper camera??? Holy hell, what are you going to do with that???? Hahahaha... Eh, you could shoot your videos with camera pulled off a $20 Ebay drone and I'd still watch it. And for some reason I really want one of those bulbs, though I fear it wouldn't be a terribly wise thing to have laying around for me to fiddle with.
That 'mini' or 'medium' Edison base is often found in microwave oven lights, occasionally fridges, and older clip-on little work lights from more incandescent by-gone days (Thrift store score). Used for better heat removal than the smaller 'candelabra' (old style x-mass) bases.
Yes... your lamps won't last longer than a month or so !!! I don't think you are supposed to touch them with bare fingers, like halogen bulbs. The glass isn't glass but quartz, isn't it ?? Hence the oils and acids from the skin tend to penetrate the quartz envelope and form microscopic or electron-microscopic holes in it and let O2 inside and the filament slowly burns out. Someone do enlighten, please...
With halogen lamps the main issue is the heat and oil film causing devitrification of the quartz and causing it to fail. In situations where a lamp has failed like that you can often see a bubble where the fingerprint caused discolouration and concentrated heat in that area.
Thanks BC, I used to be in AV in highschool and completely forgot about that. Thank you for reminding me of that. It had literally LEFT my mum... mind (truly, no pun intended)
Thanks for the details BC... Luvya.
If you put power to one filament in a fluro bulb it'll have the same effect but a slightly higher voltage (about 25) The filament first glows then the phosphor suddenly lights up. Give it a try with a compact twist bulb
Your AUDIO is really good !
The mirror in a DSLR is also used for the autofocus system, which is typically faster and more reliable than the equivalent mirrorless, although the current generation of Sonys have closed the gap dramatically.
You should send one to Cody's Lab as he has a spectrometer to analyze the chemical proportions of each section.
I'm very jealous of Cody's X=ray spectrometer.
The lamp you are looking at is very similar to one end of a standard fluorescent tube and the 10 volt arc voltage is LOWER than the filament voltage
Yes, neat. I've got an air cleaner from 1947 with 4 of those in it. Works very well.
Im so happy to see your dirty , scorched work bench again
Another good one Clive. Thank you as always. I have a few of these and like you I've tried various ways of powering them. For DC it's essential to limit the current as you so rightly say. I've found that 300mA is about right. The mains via a 4uF cap does seem to be the best driving method though and I've had one running for days with a capacitor in series and there doesn't appear to be any sputtering. Your thoughts on sputtering in neons are quite correct of course, but these UV lamps are not working in the same negative glow principle, rather thermionic emission ionising the mercury vapour and not negative glow. Anyway, I'll leave one running via a capacitor for a few weeks (out of sight because of the UVC) and see what happens. Once again thanks for producing so much wonderful and well presented scientific stuff for us all to enjoy!
DSLRs with mirrors are much more comfortable to use for taking pictures. Its easier to keep it steady by having it supported by the skull around the eye and a good pentaprism viewfinder will always offer better image quality than a digital one.
Welcome back Clive !!
I'm glad I found this video. Almost ruined my little bulb.
Zooming into the bulb right before lamp went off easy pretty clear Clive phone is pretty nice on zoomed pictures
THE UNMATCHED POWER OF THE SUN
I've used this sort of lamp before to erase EPROMS and it takes a 4.7uF cap in series runs on 12V, but using the cap it gets that 12V straight from the US mains of 129VAC.
Brainstorm: I bet this was invented in the 1920s, during the early years of GE non-vacuum light bulbs. With argon-filled bulbs, the tungsten surface doesn't evaporate as quickly as it does in hard vacuum. But depending on the drive voltage and the shape of the filament, sometimes an argon discharge will begin. Once the plasma ignites, its voltage drops quite low, and the discharge will short out the 120VAC filament, giving a brief and extremely brilliant glow before the line breaker pops. (Sometimes it melts the iron filament supports. Sometimes the hot gas pressure rises and explodes the glass bulb.)
They've harnessed this ancient but known failure mode, to create a cheap "starter" for a gas-discharge bulb! Just use pure argon, a hot filament, and a mercury-bearing surface protruding into the argon discharge.
With normal tungsten bulbs the cure was to add nitrogen, which spoils argon's low-voltage discharge. Today's incandescent bulbs all have low pressure argon plus a percent or two of nitrogen. (If you've played with buckets of cold argon gas and Tesla coils, you know that the argon has to be pure, where any contamination with air will suppress the enormous one-ATM plasma-streamers.)
With today's bulbs, when the filament breaks, still sometimes an argon-discharge develops between the broken ends, then grows to take over the entire filament sections. The bulb suddenly lights up bright blue-white, and often explodes with a bang!
(In the 1990s, someone on my Cold Fusion forum mentioned that Radio Shack plasma globes use xenon at nearly atmospheric pressure. NOT a vacuum. We all went out and tried it, but with argon or helium. Welders' argon works great! Fill a cardboard box, then stick the tip of a tiny Tesla coil into the gas. Even 20KV can make 20cm sparks! It's a plasma globe made of cardboard, with your entire arm inside. Stings a bit. Or, fill a transparent bag with pure argon (fill it 1/4th, then squeeze it out to flush out any trace of air, then fill with argon.) Stick it in a microwave oven, produces a whole multi-stage light-show. Oops, first put a small tuft of steel wool into your argon-bag, to act as a "trigger."
GLASS VASE FULL OF ARGON: ua-cam.com/video/a5PGQfUSZ_A/v-deo.html
Same basic design as old-fashioned ozone lamps. I knew they ran at a particularly low voltage, but I didn't know it was quite that low. I have a toothbrush sterilizer which uses one of these lamps, and it has an electronic ballast with a 10-minute timer.
I bought three of these for use in my 1950's/60's-era air purifier, known as the "Puratron." These were the modern-day replacements for the discontinued, original lamps, which produced more ozone. The base, BTW, is the US E-17 intermediate.
My late Uncle brought a Puritron back from the US in the 1960s. I could never figure out what the strange bulbs inside were for, now I know!
Mirrorless cameras typically have in body stabilisation, whilst great for video and handholding, it's bad for long exposures as it is a mechanism that heats up the sensor, introduces interference, and contributes further to the generation of dark current and higher read-out noise. DSLRs are exempt from this, even the Pentax K1 with IBIS doesn't have these issues, Sonys do.
Another thing is PDAF (phase-detect AF) striping showing up in images, this can be fixed in hardware, Sony however doesn't seem willing to address the problem. Sure mirrorless has many advantages, it's just not there yet no matter how people (who don't know much, quite frankly) would like to think.
For most people, mirror or not, doesn't make them better at taking photos.
I looked up the specs on this lamp, it said that this is a 'no ozone' type. Never knew there was such a lamp of this type. Dunno how they do it. I got 1 of these lamps and used Russell's AC ballast method, it works great. I do like your thot about putting a small resistor in series with the capacitor to prevent electrode sputtering.
Mercury vapor lamps give off two wavelengths of UVC. They can be treated in a way to only allow the higher of the two to pass. The newer video about the lamp that can hurt you in two ways talks about this in better detail.
Thats a very fascinating uvc lamp indeed ! many possible uses of low level uvc. thanks for vid
I have gotten the metallic film on my fog h3 bulbs on my 18 year old 4runner was very intriguing clive
Ive replaced similar bulbs in newer cars climate control systems. its weird how some last forever and others constantly blow. Ive suspected over voltage or burning them when the hvac is not running. On your shipment from the US lets hope it was shipped before hurricane season started, its ready to blow on the east coast. glad you are back to your regular broadcasting. lol
I restored a vintage ozone generator that had three of these. Great little machine.
it really does go EXACTLY *pink*