Why Cheap LED Lights Keep Glowing
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- Опубліковано 10 лют 2025
- There are LED lights that never quite turn off when switched off, this is their story…
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By: Mehdi Sadaghdar
--------------------------------------------------------------------------
"i'll make you learn things, one way or another"
This if the first time i got threatened with knowledge
Fucking TechSupportians
ElectroBoom is so "AntiBullshittic" !
Go to school or get fined.
There, I threatened you with knowledge, much like most governments do :^)
This receives the "Best Quote" award!
555th like XD
"That's it. No more using my body as capacitor"
Famous last words
lmao
Only as a resistor! From now and forever!
Actually that's what people who survived said.
I jumped when he shocked himself before he said that.
I laughed too hard on that line
"I'l make you learn things one way or another" - Thanks man
I could be a Steve but I could not
Teachers be like
iam here
Poor guy keeps getting shocked
Could be my teacher...
I love electroBOOM’s confetti, it makes me feel like I’m invited to a party which never happens
Almost every video is a party in itself... I bet at least 60% of us don't learn anything from these videos, we just make self-bets to see if he hurts himself or not. BTW I owe myself $50, time to pay up LMAO
@@HannTheftAudio don't understand anything? I learn something in every video of his
And that piano song that plays, it's so joyous in a way
@@HannTheftAudio yeah
@@DrAdityaReddy kanda not really
I like to call myself as an professional because I get paid to do stupid stuff. And since I am professional everything should be safe? I think you are qualified to same reasoning :D
Shout out to Anni and Lauri! 🇫🇮 Oh, and also rally English! 😀
Hydraulic Press Channel a legend appears
@@TheCimbrianBull professionally stupid? :D
Hydraulic Press Channel *AN professional* XD
@@friendlyoldpieceofapoppedp711
That's "rally English" for you! 😋
"I am, what you call, a Professional Dumbass™"
- Me at work blowing hundreds of LEDs and fuses at work due to forgetting the voltage transformers (2019)
I started the fire alarm at school because I attach a capacitor to my desk on a metal piece and smoke came out from the wooden part of it.
Hahaha
@@OrbitalBrain lmao
You're Fired!!! lol
🤣
I love this dude for the reason that he shows us first hand almost everything that could go wrong with doing things like this ourselves
You can tell hes smarty as hell by how many ways he can hurt himself without killing himself
It's obvious that the majority of his injuries are intentional in order to prove points about safety. I sometimes wonder if a handful of them are genuine mistakes though. He's either a genius actor or occasional dumbass.
a dumbass
@@jaynelson7214 rude but....
Sometimes
Jay Nelson I guarantee many are fake but some aren’t. The ones that would most likely result in major electrocution he probably does on purpose. Accidentally touching exposed wire might not be
6:43 I’m constantly impressed how he can draw such smooth wave forms without looking, and holding his arm sideways. And 8:50 overall, nice drawings.
I seen him looking at the wave when he drew it 😮
That would actually be really useful on an anti-static wrist strap. That way if you have a current you’re building up, you can _see_ it, rather than just imagining it exists.
250 liks
This man is the perfect example of your brain not being frinds with your body
Nah... he knows EXACTLY what he is doing.
frinds....
are you saying black people are not friendly?
nah if that was the case he'd be long dead, he knows exactly what he's doing.
the rock is cooking bruh moment
I have PTSD. Watching you touch anything makes me nervous, even writing on the white board.
"We're going to prank Mehdi by electrifying his whiteboard. Obviously, that's not the prank; we've got a pool going on *how many* times he shocks himself trying to take it apart to see how we did it. _That's_ the prank."
@@KyleJMitchell
"This circuit diagram shows how we did it. Especially notice this FOOL BRIDGE RECTIFIER!"
@THE RESISTANCE I have no idea what you're talking about
The shock made me push the home button
then don't watch it
I actually came across this issue when installing led brake light bulbs on my car. Down the rabbit hole i went only to realise after many hours of learning I just had to add a resistor on the circuits. It was a learning curve but worth the effort. If I had come across your video sooner I would have saved myself time. At least I learnt something new.
Because of you, whenever I see confetti I think someone is trying to sell me something.
translation: you have never seen a true used car commercial
What is it, plastic ?
...
What is it, titanium ?
No, THIS IS SPARTA
@@iamme2739 AHAHAHHAHAAHAHAHAHAHAHHAHA🤣🤣🤣🤣🤣🤣😂😂😂😂🤣😂🤣😂🤣😂🤣🤣😂
@@darkestone763 no, its vibranium
HAHAAHAHAHAAHAHAHAAHAHAHAH😂😂😂🤣😂🤣😂😂😂🤣😂😂😂😂
@@darkestone763 I'm 99.86% sure that you could express the same level of humor with just a lmao and 1 laughing emoji
"no more using my body as capacitor"
mehdi
i dont care if you lie to me
but dont lie to yourself
😂😂😂😂😂😂😂
S4V4GE ha ha very original!
The British Inquisition! Ikr
It’s amazing that LEDs use such a low amount of power that they can partly turn on from some random voltage from the environment.
the things that the electricity from the environnement can do that we are no aware of is really impressive. I am in my second session in college learning about electronic and the more i learn the more i believe it is as close as magic we will ever reach
@@Natshuri nah. physics+electrical major here, and i can soundly say quantum is actual magic.
@@therealjibrano Both can be magic
@@Incommensurabilities ya but only if you dont know a lot about electricity. tho i will admit fields in and of themselves are kind of like magic in how theyre areas that inherently have energy. but quantum is magic bcs we have no idea how it works lmao
The engineering topics you'd need under your belt are:
- PWM (changes the intensity of light)
- Voltage threshold (voltage drop exists in wires and below a certain threshold, the component stays off)
Manipulate voltage threshold as you need with resistors/capacitors and such. At least, that's my humble guess.
1:26 "I love discovering by accident" ❤️it!
"I'm happy to announce the presence of a full bridge rectifier"
8:36
I feel slightly happy now
Not sure who knew this already, but when you put a "time index" (if that's the right phrase) in a comment, people can click in it and it'll take you to that time in the video!
I saw the diode bridge in his diagram and quietly muttered FOOL BRIDGE RECTIFIER in excitement lmao
@@bairfamilyfarm1336 i'm not sure what you meant but what?
kd9bwi Most people know that as the text is blue, meaning it is interactive like the blue links.
Whole neighborhood power goes down.
Neighbors: 'ok he's making yet another video'
🤣🤣🤣🤣🤣
St. Devil xD
🤣🤣🤣🤣
"I'm what you call a professional dumb ass"
😂😂😂😂😂
I lost it there 😁
& at 3:55 - "above it probably burns" 😂
Haha same
The irony is thats most people on UA-cam LUL (glad they do it tho so I don't have to :p)
Yeah, despite the mind burning geekery here, he has some slapstick to keep us entertained.
@@Telerian3 did someone say Mind? ;p
I know nothing about electrical engineering but i love watching his videos.
Bharat Singh same
Bharat Singh same
Same, been watching a year now
you should try his experiments, especially the ones where he touches live wires... you'll learn about electricity easily.
its the key to everything
because in the end . everything is energy
Great video. Mixing comedy with real engineering knowledge helps expose people to the topic. Thanks for shocking yourself for the subject Mehdi
Most of the time the "shocking" is fake. He demonstrated it in another video
@@lathrin what video is it? i know he fakes them mostly but i didnt know he made a video on it
@@ripmo3503 i forgot but he mentions it in a more recent one or maybe it was the one about electronics in a bathtub
@@lathrin But sometimes you see in his videos mini-explosions, sparks, and smoke fly out?
@@Nutty151 *I'M STEVE*
"What? Is the math to hard for you?" Forgets part of equation and has to add it post script haha!
But he DIDN'T forget the Vin (6:05). It's there already.
Oh yes he did. I blame the small slate.
In a lot of circuit analysis, dividing the Vin is an automatic next step to arrive at the transfer function.
It's really nice to be able to actually see the circuit diagrams and the math behind why things happen. I do computer and electrical engineering , but I've done a lot more building of circuits rather than reverse engineering
As an Electrical Engineer, every time he does something that’s about to shock him, I have actual anxiety
As an electrical engineer you should know that all the shocks are fake.
@@evilution_ltd Doesn't look that fake (at least the first time). If they are, kudos to him, he did a very good job. Either way, the next bit where he lights the bulb with his finger is terrifying.
@@areebshaukat5840 A) there is absolutely no science to backup "immunity" to electricity. B) YOU yourself could crawl around on mains wires naked. There's a reason birds don't explode from landing on wires, and it's not because they've built up a magic immunity to 220vac. It's because theres no path to ground. C) he is not getting shocked in any of his videos. They're akin to movie explosions and pyrotechnics. If you believe actors are constantly getting blown up you're insane. If you believe he's constantly and purposefully getting electrocute you're also insane. They create a spectacle but pose very little risk to ones well being.
@@martinj9647 He's only doing a (bad) joke. Electrocuted electricians is neither macho nor funny.
@@rursus8354 I mean, it's a *little* macho.
8:35 "I am happy to announce the presence of the FULL BRIDGE RECTIFIER here..." haha, I love you Mehdi
With the exception of toasters, other heaters, and items with motors, most things in your household have a bridge rectifier as the first active component in the circuitry. Even your toaster may have one if it is smart enough or has LED indicator lights.
Crazy Russian hacker: Safety is number 1 priority
Electro boom: SaFetY iS nUmBEr OnE PrIOriTy
Shockingly! Yes
More like safety is the last priority
Cyber Infotech Safety was never an option for this guy.
safety is always my no.2 item,the first is fun!(still concerning about his health)
@Stimpy&Ren
I disagree, I think this is a good way to actually teach about the dangers of electricity.
As a sparky i have cone accross this problem with customers after i fitted their chandelier, the only way around it was to fit just 1 halogen capsule lamp in the chandalier ( which looked odd once turned on) or just have to buy various quality LED lamps until you rectify it.
As a metalhead, I love that sick blast beat of FULL BRIDGE RECTIFIER and would love to hear the whole song!
I also noticed that and got excited
google death metal rooster
5:58 this ad was perfectly placed. I didn't even fast forward past it. Well done good sir.
5:21
Because of That" FULL BRIDGE RECTIFIER" my tea cup fell from my hand
Hey Mehdi, years ago I had the same problem with cheap LED lights from IKEA: If I only disconnected one supply line, they continued to glow dimmed. They were powered by a cheap power supply and I solved the problem with a better power supply. This was a power supply which generates DC without ripple. The cheap power supply from IKEA had a considerable ripple on the DC output voltage. Therefore I suspected the cause in a kind of induction, because it was fixed with a smooth DC voltage. Induction only works with AC voltage as we all know... OK, my LEDs were designed for direct current. Therefore there was certainly no rectifier in it. That is then like a bad rectifier in the cheap LED lamps you tested. Then the ripple of the bad power supply with the direct current LEDS works like the alternating current and the bad rectifier in the AC lights, right?
Or to keep the story short: The phenomenon also exists with 5V and ripple on the power supply. Fascinating, isn't it?
". Induction only works with AC voltage as we all know... " lol ;)
does it? :p
@@erlgro Absolutely correct! But if a power supply does not produce a good DC voltage, then the small amount of changing current direction or pulsating voltage is enough to induce a small current. Then the LED lights up. And that even if only one wire is connected!
"Professional DUMB ASS" OMG I pissed myself laughing. You are the best buddy.
So I just discovered this channel. This guy is smart. He KNOWS he's about to shock himself and just does it. Day in, day out. He just straight faced shocks himself for us.
I saw that too, and loved it.
My customers are shocked when I tell them I'm not a qualified electrician........😉
BOOM: “All you have to do is add a capacitor (yes, I meant resistor)...”
Chinese Manufacturer: “Yeah, we’re not doing that.”
Chinese manufacturer: Our lights are better, you don't waste leaking current! Your leaking current is converted into a small amount of light (even when you don't want it, but at least it's not wasted!).
@@parrata You're right that the video suggests a resistor, but a capacitor would also work.
Resistor*
@@diliff I mean this makes sense. People don't complain about they can't see but it doesn't mean there's no problem.
I guess that he meant resistor not capacitor, it is the capacitor that makes the light glow in the first place.
3:00
This guy is a good guy. He puts himself at risk from a small painful shock for the viewers
Everytime he connects something, I wait for the arc
Let's be honest...its why we're here
or the shock
Lol
To hell with the arc or shock, I'm waiting for the pain he sustains from it 😈🤣😈🤣😈🤣😈🤣😈🤣😈
I like to think that this is an education channel
I can’t tell but it’s funny
If we're talking about this being somehow educational, we should all try to replicate the results first.
We should all strive to be as educated as this man, and to be as conductive as this man 😂
edutainment fits well
Im ded
Yeh
Hi sir
One thing i like this channel very much because you first demonstrate practically and then theoretically by drawing circuit diagrams and your puns and getting shocked frequently and with standing it like an iron man...
And at end of video your voice music is splendid...
Another amazing content sir....🙏👍😊
ikr?great channel
14!
Gau mutra
@@taufeeqkhan2629 you have entered the comedy zone
When he tries to plug something in, my heart beats faster than HULK. 😨
Instead of breaking the return wire of the circuit, break the live wire. I had this problem when I replaced fixtures in my house. Some glowed and some did not. The ones that glowed the switch was breaking the return wire, which works with Incandescent lights but not these lights. I re-wired the switch so that it broke the live wire going to the fixture.
I thought it's common sense to install the switch on the live side before the appliance, as taught in school.
Yeah, switching the live wire is standard and safer. Doing it the other way around leaves the return wire live even when the switch is off. (Although you should turn off the circuit breaker anyway for extra safety when working on it.)
I lighted a cheap LED strip the other day with the touch of my finger.
I thought I had super powers, I was even picking my own super name.
Thank you for ruining my dreams, ElectroBOOM. Unsuscribed.
That's a nice idea for a party trick!
You should check the video of the fake power sources too hahaha+
No one has super powers also your not a battery
@@AstroSystemGR bruv it's a joke laugh at it
@@AstroSystemGR why not?
Never closed "How to remove your mustache" so fast
5:20 Full Bridge Rectifier, GET THE MERCH! Made we actually laugh out loud.
me too, lol
As someone watching this with zero context about this joke, the merch, and any understanding of electricity, this felt so random that I genuinely laughed. And then he just goes back to normal like it didn't happen. Like, what? 😂
This is the 5th video of yours that I've watched in a row and now I need to go visit my doctor for high blood pressure...
He's a science channel, has a soothing voice
*_I WATCH HIM FOR THERAPEUTIC PURPOSES_*
I wondered how you found a Steve Mold video that I didn't watch. you are giving away unlisted videos!!
it's available now
Wtf it says you commented that 5 hours ago
@@ewanbird1847 a-aand?
@@jkobain theoretically the vid was just uploaded
These are companion video. These are interconnected these are not given in channels unless there is another given. So both of these are given together.
4:05 what is this titanium 👍🏻🤣🤣🤣🤣🤣🤣
"What is this, platic? .... TITANIUM?" LOOOL xD
the glue they use seems to be lol.
I just discover this channel and I'm laughing my ass of. Oh my, I should searched for electronics UA-cam channels before, this is GREAT.
Jose Antonio Lopez Gomez This is BOOM, Scott is GREAT
if you think this is funny, find his video on making an electric guitar...I warn you though...don't drink anything while watching...you will spray your monitor!
He *ALWAYS* forgets to kill the power & *ALWAYS* gets shocked at least once (usually a lot more)!
He kills me every time!
Welcome in family
Late but good we are watching since 1st video have gained plenty of knowledge
tl;dw: LED lights are SO INSANELY EFFICIENT that now you can power it just by rubbing your sock on a carpet, and that's why some circuts passively power these lights.
Massively, massively underrated comment!
These channels make me wish I still had that electronic playset my parents gave me when I was younger, that taught these things like how LEDs work (and had a huge book of how to set things up).
6:28 - thank you so much, Mehdi, I appreciate it a lot!
Questions that never can be answerd
UA-cam Reccommendation
How can electroboom still be alive
What im doing with my life
And Which is that 17k steves
Maybe his stupidity is an act...
Jokes on you. 42k Steves
I'm taking a wild guess that ElectroBOOM doesn't let more than a couple dozen milliamps cross his body (this episode shows only a couple hundred microamps [
Good job Mehdi. I have no idea what the hell you are talking about and yet I am still subscribed watch every video.
5:11 "and now we do some measurements to figure out the circuit..BEEEEEP..there we go, this is our circuit". LOLed IRL
Mehdi, I would love if you made a video explaining the frequency domain and using transfer functions with AC circuits. You're really great at explaining some difficult abstract concepts! Keep up the great vids!
0:47 scared the crap out of me! Subbed!
The day before this video came out: Buy a capasitor on sale!
Next day: buy a mehdi on sale!
I have 2 LED nightlights in my apartment. During a recent power failure when everything else in my apartment was out, these 2 nightlights continued to work at about half their normal brightness. At the time it both confounded and pleased me no end. I presumed it was some sort of brown out where the voltage fell low enough as to prevent most things from operating but not completely out. Last night we had another power failure but when I arrived home, both the nightlights were out.
Nah bro you just discovered free energy, congrats
During a power outage the capacitor will drain eventually,
So it might've just been time that made the difference.
Anyone else worry that this channel is going to end up like Steve Irwin...
That's an angry socket, crikey...
Duct tape can't fix stupid, but you can use it to muffle the sound.
Watch as I walk over to that socket over there, and jam my thumb up it's butt'ole!
I wonder if Agent Orange Chump has tried that?
This guy knows his stuff. The self-electrocution is always controlled and is done for comedy relief only.
nut fani dident lav
"You shouldn't forget to turn the light off or open the breaker before working on your electricity" - best line in any science video ever. Edit: No that's second, best is "I love discovering by accident!" This guy is AWESOME! Edit 2: "That's it, no more using my body as a capacitor!" - funnier every minute! Edit 3: "stupid loose wires" - I'm dying here!
Rest in peace
The floor is grounded through the conductive mortar on your floor, and so are you when you sit in a metal chair. Your body did not act as a capacitor, rather a weak resistor. The more direct contact with the ground, the higher the voltage. Concrete and mortar conduct electricity poorly, but they do. This is the reason the cheap bulb didn't shock you and the cut open one did. The capacitor in the circuit limited the current. The cut open bulb connects directly to a rectifier with no reactive capacitance or resistors. With that cut open bulb, the only current limiting factor when you touch the ground wire directly is the small resistance of your body.
Don't you dare correct @ElectroBOOM . @ElectroBOOM What is this guy saying? Is he correct?
@@ahpacific NO.
"Now lets touch the probe, hmm, doesn't hurt".
"NOW lets touch the earth wir- OWW".
I Don't understand a single Word but i'm watching because it always make my Day better.
We're on the same boat, there.
I understand him but he does get into some detailed stuff but he broke it down nicely,
He used the resistor to absorb some current that is stuck in a loop to stop the glow, the small lights can glow with the left over charge while the light is turned "off". It uses the wire in your home as a tool to keep the looped charge.
That's what I got from this. Would be fantastic for hallways at night.
Zato trebaš znati fiziku braleee
@@ivanokriletic2428de šuti dobro da sam još ikako izgurao trojku sad u osmom😂😂😂
Danijel Dokuš I’m a Yorkshire lad but I can understand him
The fire department is always standby everytime he starts recording
And the Medics!!
I had that problem with my desk lamp. Never figured out what was causing it. When I touched the lamp it started glowing. I got rid of it because I feared it might shock me
The desk lamp case was grounded
¡Gracias!
*You should turn off the light switch before tampering with electricity*
Unplugs alligator clips with lights still on
**clicks ElectroBoom's video**
Mehdi: A friend of mine called Steve Mould told me...
**me goes to watch Steve's video**
Steve: A friend of mine called Mark Warner showed me....
The Flare did Mark Warner have another friend
@@JuNTaBiOs Can't say anything for he hasn't uploaded a video yet.
**See this comment on Steve's channel**
**goes here**
**ah, here we go again**
ElectroBoom needs more booms that will boom his channel to a booming 10M
you can really tell when he makes a planned accidental discovery for the video and a real accidental discovery he makes, it’s so genuine.
2:24
Never touch the live wire,
Touches the live wire
LMAO 😂🤣😂
Rajesh Bayyavarapu
Shut up kid
@@abstractsophy +1
Because it takes a lot of knowledge how to do it safely. He's telling you not to do it because if you don't know how to do it, you will get fucked up/dead. He knows how. Don't do what he does. Do as he says.
Well he's a professional dumbass
@@abstractsophy 🤨
4:38 have you thought about taking a glove with a metal pad on the index finger and hooking it up to a bread board on the back of you're hand and then you can keep a store of different sized capacitors on the bread board and just plug in the one you want and then you can touch away :)
or just sellotape the probes from you're multi meter to your index fingers... and duct tape the multi meter to your wrist ... either or...
Electricity:- How much current do you want?
Mehdi:- YES!
Can someone please explain this yes meme. I see this all over you tube and do not understand what this means!.
@@alenmccoy yes
@@alenmccoy means most-extreme-case scenario (that you can imagine) in an inquiry that is not a 'yes or no' question. for example, an inquiry to Tyrion Lanister: "how many women have you slept with?" and he replies "yes"
@@MassDynamic Thank you.
I have seen the exact same thing happen with Compact Fluorescent Lamps. They will flicker in total darkness even though there is an open circuit.
1:58 I watch YOU for therapeutic purposes! (shock therapy by proxy)
I'm wearing headphones and jumped at "FULL BRIDGE RECTIFIER"
Full bridge rectum frier
Eddy Current Suppression Ring is one of the coolest band names Ive ever heard. Straight from an electronics handbook!
@@mathiassilberthal7742 AHHAAHAAHAHAHAHAHAHAHHAHAAHAHAHAHAHHAAHHAAAHAHHASHAHHSSHSHHAHAHAHAAHHHHAHAHAHHAHAHHH😂🤣😂🤣😂🤣😂🤣😂🤣🤣😂🤣😂😂🤣😂🤣😂🤣😂😂😂🤣🤣😂
The old compact flourescent lamps/bulbs would keep glowing due to the phosphor and impurities in the cheap (and toxic) coatings.
Some bulbs/lamps glow from magnetic fields from power lines etc.
Also my headphones do as well.
1:24 a clear definition of Serendipity
I love how that you both released the videos at the same time (subbed to both by the way)
*So Thor able to shock people because he is just a big CapaciThor*
so name Thor explained
First
Technus I don’t care
i Hughmann i’m shocked
😂 😂 😂
Subscribe
Expensive LED light makers:
Capacitors are very important.. We must attach em to LEDs
Chinese manufacturer: We don't do that here
Chinese Manufacturer: Whats the point in a light bulb if it don't glow?
Resistors.
Chinese manufacturer: It’s ok ElectroBOOM will perform well as a resistor
Subscribed! You cracked my up with that shock stuff, your enthusiasm for your work, and the way you snuck in your sponsor. Great work
That sudden tone-change at "full bridge rectifier" always gets me. xD
Thanks for the excellent explanation, truly enlightening analysis and answered a lot of unasked questions.
it was quite illuminating advice
@@guillaume6373
*ba dum tss!* 🥁 😂 🤣 😅
Maybe those LED bulbs have an _undocumented night light feature_ LOL 🤣
I remember back when they started to introduce the low power flourecent lamps some of those had a similar problem were when turned off they would flicker like trying to turn on and that sometimes would cause them to turn completely on and you could not turn them off. I knew back them the problem was caused by the light socket being wired wrong and the switch instead of cutting the live wire it was set to cut the neutral.
Don't comment on videos often, but I want to let you know that I really like the information and ways of thinking you put out into the world. Keep it up!
0:48 Oh God ! This guy scared the shit outta me😂
I've done that exact thing before. Even if his reaction was fake, mine was exactly the same as his. I couldn't see for a few seconds because of the arc flash.
7:44 "ah it shocks a little bit..."
He loves getting shocks🤣
Isn't it shocking?
@@alexeydzema5268 It's electrifying 🤣
I really liked this video. You gave a very good explanation of tthe subject. I also have found led lamps that don´t quite turn off and now I understand why.
2:44 electroboom is howtobasic
I soo fucking agree with you
Only thing missing is eggs
I was already subscribed. Am I a Steve now?
I tink it glows wen it touch's your body because your body is now 20% electricity
I like how his hands are covered with plastic dust at 4:08 lmao
steve: "im not qualified for this but I know someone who is..."
You are the real teacher of electronics.
Make more awesome videos.
Please never quit youtube
Brief explanation!
I once have the same problem before. My LED light in my bedroom kept glowing while it was turned off, then I realized it was because that I connected the switch wrong. So whenever I turned it off, the neutral wire disconnect but the live wire was still connect. I thought it was malfunctioned, then my dad flipped the plug and solved the problem.
This makes so much more sense, thank you!
In Italy there are screwdrivers with a little light in them, which you can use to test live wires for current. If you touch the screwdriver to the wire, and then your thumb to the back of the screwdriver, and there is current in the wire, the light will turn on. Sounds like the same principle as the chinese led light.
They are working somehow differently, as no capacitor is involved within the screwdriver. There are two electric components: a neon glow lamp and a high-resistance resistor (sometimes built into the lamp). The resistor limits the current to a harmless level.