The term Light Emitting Diode, LED, is the most accurate and self descriptive, for 2 reasons. Firstly, it is a diode, because electricity can ONLY flow in one direction, PN junction. Secondly, it is a very small/tiny component. The term Light Emitting DEVICE is misleading, because, as some people have pointed out, any lamp/light can be described as a device. A device, generally speaking, in my mind, implies some much bigger in size, for example a fridge, TV, computer, etc...
It's been a long time since I dealt with band theory; it was most helpful in making your presentation more useful for this newcomer to LED applications. Thanks.
Just FYI... LED still stands for Light Emitting Diode - It always has and always will. I've worked in electronics for over 30 years and I've NEVER heard anyone call it anything else. All the component manufacturers still call them diodes too. Why do people bother making videos if they don't know what they're talking about?
Hi! I understand you never heard this in the past, but surely you will in the future (and probably this video is your first time. Nice!). The group of professors that developed this video are familiar with current research on lighting and I can give you just a few references of good research papers in outstanding scientific journals in which this is the accepted meaning of the acronym: www.nature.com/articles/nphoton.2013.70 (2013); www.electrochem.org/dl/interface/wtr/wtr09/wtr09_p037-041.pdf (2009); www.sciencedirect.com/science/article/pii/S0925346717302045 (2017); pubs.acs.org/doi/abs/10.1021/acsphotonics.7b00864 (2017). We are scientist, not component manufacturers. We decided to use the acronym that seems to be the right one for the coming years, not for the last decades. It's our style to humbly communicate the little that we know and share this information with people (even with not so humbly ones in their manners). I would be more than happy if you learn this piece of information from our video (which is not perfect, no doubt about it, we did our best though). Thanks for commenting!
My point is that you are talking about a group of professors, so a relatively small group of people that are using this term. Just because a small group of people decide to call it something different does not mean that the name has officially changed for everyone else. There are hundreds of thousands of electronics engineers, hobbyists, manufacturers and suppliers in the world and we all call it a Light Emitting Diode because that's its name. Yes, your new term is technically correct as a description, because an LED IS a device that emits light, but so is a halogen bulb or a CFL or even a cigarette lighter - they are ALL light emitting devices. It would make no sense at all to change its name to something generic like that when it already has a specific name that uniquely identifies it aside from all the other types of light emitting device. Your term works as a general description but it's never going to replace the name "Light Emitting Diode" outside your group of professors.
Read the other comments on here - everyone agrees! You can't just decide to change it and expect everyone to accept or adopt your new name. The world doesn't work like that! They've been called Light Emitting Diodes for over 50 years so that's what everyone knows them as. It would be like me deciding to change the name of Spain to "Europe" and then making a video about it!
I see your point. To clarify things, i) it's not a small group of people using the term, but it's the trend in the scientific community; ii) obviously LED is a light emitting diode... when the emitting device is a diode. But nowadays there are devices that are "somehow" like diodes, but they are not diodes. That's why the use the general term "device". Probably it's not the best name, I agree with that, but that's how they call it. Probably we should say "electronic light emitting device" (I'm not even convinced about this). It's not a relevant argument, but in Acronym Finder it's also registered this entry, it's not my invention. www.acronymfinder.com. Anyway this is controversial, I agree, but we did our research first and decided to use this. If I would use "light emitting device", there would be people commenting they have seen the new acronym stands for light emitting device. It's a hard task to find something that makes content everybody. Anyway it's my pleasure to comment on every detail of the video, thanks for commenting. And about Spain, if you do your research from reliable sources and find you can use "Europe", why not? :-D
@@fmgomezcampos so instead of giving uniquely identifying names to these diode-oids, they instead hitchike on LED's known "brand name"? That's as backwards as naming LEDs 'lamp' or 'diode' so people can't tell the difference. Plus eLED sounds catchier.
It's light emitting DIODE not "light emitting device"!!! Every light source is a light emitting device. Candles, gaslights, incandescents, fluorescent tubes. All are light emoting devices.
Right when they said LED now stands for Light Emitting Device i lost all faith in this video. I have never heard it called that and to call it that is retarded seeing how an LED works as a Diode lol. I guess only hipsters who don't know anything call it that to be different. Even my 90 year old grandfather knows its called a Light Emitting Diode lol.
Yes, the LED's are still diodes. They will only work if they are connected the right way versus a normal light bulbs where they can be connected eather way.
deepCdigger D’James Light Emitting Device is meant general public only, but on the other hand, all technical people will and only will say as Light Emitting Diode.
I think that complete lamp fittings with LED's and just called LED lamps. Would you prefer they be called multi LED fittings? I have over 20 LED lights (multi Light Emitting Devices) to my new house. It's just a changed way of calling lamps made from LED'S.
"Originally, the word LED stood for 'Light Emitting Diode'. Currently, it is used as the acronym for 'Light Emitting Device'." And I stopped right there. A candle is a "light emitting device". If you can't get something as simple as that right, I have no reason to trust that you'll get the rest of it right, either.
It seems a bit dumb to use LED for Light Emitting Device. By that definition, an incandescent lamp is an LED... Screw it, even a candle can be called an LED now!
Can anyone tell me how current is flow at junction point of two different types of material which is in only physical contact and forming a complete circuit
"Light Emitting Device"? An incandescent filament light bulb is a light emitting device. So is our Coleman white gasoline-burning lantern and a candle.Otherwise, nice video.
I agree that even non electrical field people can understand this video. What they don't understand is, the lady is wrong in saying it is a light emitting device. It is a light emitting DIODE.
Can the heterostructure be applied to red and green or even infrared LED ? Why using fluorescent material to convert blue light into white light instead of using a set of three LED (red, green and blue) to make white light directly ? the power spectrum of a blue LED with fluorescent show a blue spike which differ from the spectrum of the natural white light emitted by the sun. Can we do better "white light fidelity" ? I am dreaming of a third episode as good as this one and as the other one on PN junction. Thanks !
Maybe there is videos explaining CRI values for LEDs. I guess using phosphorus is making a much wider range of colourband compared to have seperate colour leds.
The other answer is part of this. LEDs have rather narrow frequency (color) bands, and even having all 3 primary colors leaves gaps in the 'white' light. Phosphorescent coatings give off a wider band of frequencies (colors) and in the end have a higher color rendition index (CRI). Google can help more from here if you still have questions (which I'm sure you do). This is actually a fascinating topic to look in to...
Donde está el vídeo último mencionado a 02:15 sobre los "PN Junctions" por favor en inglés si posible de la preferencia de mío. Pero si solo en español, también es muy bien solo me gustó la manera cual que se explica los hechos (información)
This video has incorrect information... p-type (boron doped) silicon has holes and n-type silicon (phosphorus doped) has free electrons. electrons flow from the n-type to the p-type once a voltage of roughly .7V is reached. Current, using the positive convention, is in the direction from p to n.
Hi! could you indicate the time where the unaccurate assertion is made in the video? I think you're almost 100% right, and I think the video agrees with your comment. Apart of that, the 0.7 V you mention is not the voltage for that, the process you mention is true for any positive voltage, but about 0.7 V is when that process yields measurable currents... for silicon pn junctions. LEDs have not necessarily that threshold voltage, nor pn junctions made of other materials. Thanks for commenting!
I think that comment is about the 2:30 time, and that it is based on a mistaken view. The P region is shown with negative signs, indicating the charge of the atoms in the lattice corresponding with the positively charged holes that are created by the 'captured' electrons. The commenter assumes those signs should be positive to correspond with the charge of the holes (shown as floating white dots). And the converse is true for the N region, showing positive signs for the atoms and the free electrons as floating black dots.
And as for current flow, it is opposite in direction to electron flow. But it is electrons that are shown flowing, and in the correct direction if I am not mistaken. Thus full marks from me for an excellent video.
Thanks for your comment, it makes sense to me :-D Thanks for the congratulations too, we took very seriously into accout every detail in the script and in the videio... but nothing is perfect, that's why I'm open to criticism to improve. Thanks!
Im confused by your image of the PN junction, where there is negative signs underneath the P type, and positive signs underneath the N type. Doesn't the P type hold positively charged holes, while the N type holds negatively charged electrons?
+Shane Finnerty Hi! Well, the P type region has positively charged holes as free carriers, while P impurities remain negative when they release their holes. The inverse applies for the N type region. That's why you found it confusing, you have to remember that P and N type regions are neutral when connected, free carriers balancing charged impurities in each semiconductor. Does this make sense for you? Thanks for commenting!
This is about the material of the semiconductor Silicon is a tetravalent element. The N-type of the semiconductor has a impurity with a spare electron who voluntarily want to cede this electron if there is electric current applied. The P-type of the semiconductor has a impurity who is welcoming to receive this electron from the N-type.
Hi! Black is the absence of light. You can define the absence of light as a new colour, of course, but there are no black photons or black lights (unless you define something funny as a black light which, by the way, I'm not going to tell you that's impossible. I've seen many funny weirdly defined things in the internet). Thanks for commenting.
Annnnnnd just like when they tried to explain atoms, neutrons, protons, adverbs, pumpkin pie etc in school....my mind went into lockdown! I will stick to woodwork!
Who invents this stuff. Did some person just know about how electrons behave and then thought; I can made this light up. Or is is a case of ideas building on ideas.
You could argue the same for LED bulbs. Both have higher efficiency than the incandescence bulb. Neither are 100% efficient. (When you define efficiency as watts visible light /watt consumed)
The graphics are very nicely illustrated.But the voice could be a bit more interesting by changing tones.It grew a bit monotonous at the similar voice pitch.otherwise,its awesome.
They said LED cost you very low electricity bill. What they don't tell you is, it cost you more on replacement and have lower lifespan. 10000 hour lifespan? The electronic controller failed first before the LED failed.
I once sat through a class by an "engineer" from China who proceeded to lecture us on LED's and video display modules. According to him, the reason outdoor LED's get dimmer as they age has nothing whatsoever to do with the weather or sunlight causing dirty or cloudy lenses, or aging and degradation of the semiconductor material inside. It is actually due to depletion of the fissionable nuclear material inside. Then he said that's how the sun works. This from the same "engineer" who claims it is impossible for these modules to get any water inside, and impossible to provide a drain hole for any trapped water. The display modules are designed without fuses or any kind of over current protection because there is no room for fuses in his warehouse. I couldn't tell if he actually believed any of this BS or if he just thought Americans were stupid enough to buy it. Mentioning this to my company's VP changed nothing.
LoL. I don't know *your* VP, I know the VP type. The VP understands the technology much less than either you or the Chinese engineer for sure. If it was a reasonably sized company, it's safe to say he didn't care. Maybe you should have told the CTO. I have had the pleasure of meeting engineers from many different countries. Some are technology freaks and some are what we called "sales engineers". The country does not appear to be the discriminating factor.
The term Light Emitting Diode, LED, is the most accurate and self descriptive, for 2 reasons. Firstly, it is a diode, because electricity can ONLY flow in one direction, PN junction. Secondly, it is a very small/tiny component. The term Light Emitting DEVICE is misleading, because, as some people have pointed out, any lamp/light can be described as a device. A device, generally speaking, in my mind, implies some much bigger in size, for example a fridge, TV, computer, etc...
It's been a long time since I dealt with band theory; it was most helpful in making your presentation more useful for this newcomer to LED applications. Thanks.
Just FYI...
LED still stands for Light Emitting Diode - It always has and always will. I've worked in electronics for over 30 years and I've NEVER heard anyone call it anything else. All the component manufacturers still call them diodes too. Why do people bother making videos if they don't know what they're talking about?
Hi! I understand you never heard this in the past, but surely you will in the future (and probably this video is your first time. Nice!). The group of professors that developed this video are familiar with current research on lighting and I can give you just a few references of good research papers in outstanding scientific journals in which this is the accepted meaning of the acronym: www.nature.com/articles/nphoton.2013.70 (2013); www.electrochem.org/dl/interface/wtr/wtr09/wtr09_p037-041.pdf (2009); www.sciencedirect.com/science/article/pii/S0925346717302045 (2017); pubs.acs.org/doi/abs/10.1021/acsphotonics.7b00864 (2017). We are scientist, not component manufacturers. We decided to use the acronym that seems to be the right one for the coming years, not for the last decades. It's our style to humbly communicate the little that we know and share this information with people (even with not so humbly ones in their manners). I would be more than happy if you learn this piece of information from our video (which is not perfect, no doubt about it, we did our best though). Thanks for commenting!
My point is that you are talking about a group of professors, so a relatively small group of people that are using this term. Just because a small group of people decide to call it something different does not mean that the name has officially changed for everyone else. There are hundreds of thousands of electronics engineers, hobbyists, manufacturers and suppliers in the world and we all call it a Light Emitting Diode because that's its name.
Yes, your new term is technically correct as a description, because an LED IS a device that emits light, but so is a halogen bulb or a CFL or even a cigarette lighter - they are ALL light emitting devices. It would make no sense at all to change its name to something generic like that when it already has a specific name that uniquely identifies it aside from all the other types of light emitting device. Your term works as a general description but it's never going to replace the name "Light Emitting Diode" outside your group of professors.
Read the other comments on here - everyone agrees! You can't just decide to change it and expect everyone to accept or adopt your new name. The world doesn't work like that! They've been called Light Emitting Diodes for over 50 years so that's what everyone knows them as.
It would be like me deciding to change the name of Spain to "Europe" and then making a video about it!
I see your point. To clarify things, i) it's not a small group of people using the term, but it's the trend in the scientific community; ii) obviously LED is a light emitting diode... when the emitting device is a diode. But nowadays there are devices that are "somehow" like diodes, but they are not diodes. That's why the use the general term "device". Probably it's not the best name, I agree with that, but that's how they call it. Probably we should say "electronic light emitting device" (I'm not even convinced about this). It's not a relevant argument, but in Acronym Finder it's also registered this entry, it's not my invention. www.acronymfinder.com. Anyway this is controversial, I agree, but we did our research first and decided to use this. If I would use "light emitting device", there would be people commenting they have seen the new acronym stands for light emitting device. It's a hard task to find something that makes content everybody. Anyway it's my pleasure to comment on every detail of the video, thanks for commenting. And about Spain, if you do your research from reliable sources and find you can use "Europe", why not? :-D
@@fmgomezcampos so instead of giving uniquely identifying names to these diode-oids, they instead hitchike on LED's known "brand name"? That's as backwards as naming LEDs 'lamp' or 'diode' so people can't tell the difference. Plus eLED sounds catchier.
Good video. LED = Light Emitting Diode !!!
This bullshut people! She use it for public purpose! And she said also its L E Diode! Pls listen carefully
Watch another time the video.
@Ritesh Kakkar there is a fact that each color has alternative photons wave lengths
We humans can be amazing when we want to be. A great video for a phenomenal invention.
It's light emitting DIODE not "light emitting device"!!!
Every light source is a light emitting device.
Candles, gaslights, incandescents, fluorescent tubes. All are light emoting devices.
Right when they said LED now stands for Light Emitting Device i lost all faith in this video. I have never heard it called that and to call it that is retarded seeing how an LED works as a Diode lol. I guess only hipsters who don't know anything call it that to be different. Even my 90 year old grandfather knows its called a Light Emitting Diode lol.
Yes, the LED's are still diodes. They will only work if they are connected the right way versus a normal light bulbs where they can be connected eather way.
deepCdigger D’James Light Emitting Device is meant general public only, but on the other hand, all technical people will and only will say as Light Emitting Diode.
I think that complete lamp fittings with LED's and just called LED lamps.
Would you prefer they be called multi LED fittings?
I have over 20 LED lights (multi Light Emitting Devices) to my new house.
It's just a changed way of calling lamps made from LED'S.
As I said above, English is not the Spaniards strength. This is from Granada, Spain.
What the hell? "Light Emitting Device"? I've never heard that before. You're a university, you're supposed to actually know what you're talking about!
"Originally, the word LED stood for 'Light Emitting Diode'. Currently, it is used as the acronym for 'Light Emitting Device'."
And I stopped right there.
A candle is a "light emitting device".
If you can't get something as simple as that right, I have no reason to trust that you'll get the rest of it right, either.
It seems a bit dumb to use LED for Light Emitting Device.
By that definition, an incandescent lamp is an LED...
Screw it, even a candle can be called an LED now!
eine Parafin-LED ☺☺ lololol
It's Light Emitting Diode not device..
A kerosene lantern is Light Emitting Device
That was killing me, I had to know, thanks for uploading this
Awesome video!!
I love the animation! Well explained. Thank you.
Can anyone tell me how current is flow at junction point of two different types of material which is in only physical contact and forming a complete circuit
"Light Emitting Device"? An incandescent filament light bulb is a light emitting device. So is our Coleman white gasoline-burning lantern and a candle.Otherwise, nice video.
Well done! Thanks for the great presentation, including good graphics. :)
Even non-electrical field people can understand this video. Very good and very good animation. Thumbs up and subscribed!
I agree that even non electrical field people can understand this video. What they don't understand is, the lady is wrong in saying it is a light emitting device. It is a light emitting DIODE.
3:08 i saw Suzanne 😁
Can the heterostructure be applied to red and green or even infrared LED ? Why using fluorescent material to convert blue light into white light instead of using a set of three LED (red, green and blue) to make white light directly ? the power spectrum of a blue LED with fluorescent show a blue spike which differ from the spectrum of the natural white light emitted by the sun. Can we do better "white light fidelity" ? I am dreaming of a third episode as good as this one and as the other one on PN junction. Thanks !
Maybe there is videos explaining CRI values for LEDs. I guess using phosphorus is making a much wider range of colourband compared to have seperate colour leds.
The other answer is part of this. LEDs have rather narrow frequency (color) bands, and even having all 3 primary colors leaves gaps in the 'white' light. Phosphorescent coatings give off a wider band of frequencies (colors) and in the end have a higher color rendition index (CRI). Google can help more from here if you still have questions (which I'm sure you do). This is actually a fascinating topic to look in to...
Very creative and lucid explanation.
You did a great job !
Keep it up!
Oh, thank god for this. There's been so many videos where the accent of someone was a little too thick to understand but this is perfect!
very good explanation than other vedios
Very well done, clear, rich informative content !
loved the robot dance at the end! 😂
"How LEDs work" is not a question - it's not even a sentence.
0:33 That's a vacuum fluorescent display, not LED.
Technically if you wanted to forgo the LED terminology, It is a P.E.D. (Photon Emitter Diode).
One of the best video for understanding led
Stopped watching when they said LED stands for Light Emitting Device. Any light source is a light emitting device so they are talking shite.
stopped when i heard a woman s voice
cplcabs I much prefer incandescent light emitting devices for the comfort of my eyes.
They are Spaniards. English is not their forte...
I was going to post this same thing lol.
HEY! It's an LED now!) Ugh.
cplcabs LED Light Emmiting Diode .
Donde está el vídeo último mencionado a 02:15 sobre los "PN Junctions" por favor en inglés si posible de la preferencia de mío. Pero si solo en español, también es muy bien solo me gustó la manera cual que se explica los hechos (información)
thanks for those great explications.
Is there any filament in led bulb.
the band gap is also called forbidden energy gap.
smaot ?
" Smart lights " . Lights that flicker, disrupting your concentration and sabotaging your eyesight. Give me incandescent any day.
Nice video I learned alot from this helped me on my tech project keep it up!
Cool video!
Nice talk, I would like to know what type of fluorescent materials used on top blue LED to get white light.
People didn't change to saying light emitting device
This video has incorrect information...
p-type (boron doped) silicon has holes and n-type silicon (phosphorus doped) has free electrons.
electrons flow from the n-type to the p-type once a voltage of roughly .7V is reached. Current, using the positive convention, is in the direction from p to n.
Hi! could you indicate the time where the unaccurate assertion is made in the video? I think you're almost 100% right, and I think the video agrees with your comment. Apart of that, the 0.7 V you mention is not the voltage for that, the process you mention is true for any positive voltage, but about 0.7 V is when that process yields measurable currents... for silicon pn junctions. LEDs have not necessarily that threshold voltage, nor pn junctions made of other materials.
Thanks for commenting!
I think that comment is about the 2:30 time, and that it is based on a mistaken view. The P region is shown with negative signs, indicating the charge of the atoms in the lattice corresponding with the positively charged holes that are created by the 'captured' electrons. The commenter assumes those signs should be positive to correspond with the charge of the holes (shown as floating white dots). And the converse is true for the N region, showing positive signs for the atoms and the free electrons as floating black dots.
And as for current flow, it is opposite in direction to electron flow. But it is electrons that are shown flowing, and in the correct direction if I am not mistaken. Thus full marks from me for an excellent video.
Thanks for your comment, it makes sense to me :-D Thanks for the congratulations too, we took very seriously into accout every detail in the script and in the videio... but nothing is perfect, that's why I'm open to criticism to improve. Thanks!
Hairy Pickle yes it's .7ev (electron volt)
Best video as compared with other videos which based on the topic of led.
Splendid.
Great video
Im confused by your image of the PN junction, where there is negative signs underneath the P type, and positive signs underneath the N type. Doesn't the P type hold positively charged holes, while the N type holds negatively charged electrons?
+Shane Finnerty Hi! Well, the P type region has positively charged holes as free carriers, while P impurities remain negative when they release their holes. The inverse applies for the N type region. That's why you found it confusing, you have to remember that P and N type regions are neutral when connected, free carriers balancing charged impurities in each semiconductor. Does this make sense for you? Thanks for commenting!
I remember seeing LEDs in 70s video games, and industrial machinery. All I saw then was red. Not a metaphor, I literally saw red LEDs.
Apparently the were able to create red and green LEDs but blue took years to figure out
Very Educational, & Fantasy Video.. Thank You Very Much.. Keep Up The Great Work..
Yes great invention. Making kids and people blind .
kids are not people?
@@davidjacobs8558 hahahaa
This video is lit.
Nice video. Well done !!!
The diagram shown P and N are the other way around
P is the positive side where N negative side flows to P side
I thought the same.
Hi! I don't understand what you mean, could you explain it in more detail? Thanks!
This is about the material of the semiconductor Silicon is a tetravalent element.
The N-type of the semiconductor has a impurity with a spare electron who voluntarily want to cede this electron if there is electric current applied.
The P-type of the semiconductor has a impurity who is welcoming to receive this electron from the N-type.
Great!! superb explanation.... that really Helped ... a lot!!!!! Thanss.. pls keep on making more videos
blender animation was cool
The dubbing sound is very nice by the way
Never say it is a device it is diode
god bless japan who invents this product for better world 🗺
Wrong
The princip of light emitting discover russian Alferov (Noble prise)
I hope I’m not the only one that recognize that opening from the Atari video game pitfall
Excellent video..osm..keep it up...😊😊😊😊😊😊☺☺☺☺☺☺☺☺☺
Very good video, very helpful.
I hope you are joking
Nice crash sir
If subject was taught to me this way I would have been a scientist now
👌👌cool...
Incandescent lamps make really good food heaters though.
what about black? we can see shadows so it must be a visible colour?? 🤔🤷♂️
Hi! Black is the absence of light. You can define the absence of light as a new colour, of course, but there are no black photons or black lights (unless you define something funny as a black light which, by the way, I'm not going to tell you that's impossible. I've seen many funny weirdly defined things in the internet). Thanks for commenting.
Light emitting DEVICE?? Come on !!
Very curies idea of complexity of led explain simply
Annnnnnd just like when they tried to explain atoms, neutrons, protons, adverbs, pumpkin pie etc in school....my mind went into lockdown!
I will stick to woodwork!
Feel the power of the LED!
Which app u using for editing your video
Very clear and useful video
Thank you for sharing.
In English we pronounce Valence, with a long A, like in May, Day, Say and hay.
Not in British English, and it's our language so listen and learn!
Optoelectronics - it's here to stay!⭐️⭐️⭐️⭐️⭐️⭐️
Good explanation
When current flow occurs in a p.n. junction it is called forward biasing
Who invents this stuff. Did some person just know about how electrons behave and then thought; I can made this light up. Or is is a case of ideas building on ideas.
Hi, this is very good LED explanation. I'd like to ask for your permit to use it on my web site. I will keep the original link of this clip. Thanks
Of course yes :-D Thanks!
Florescent lights arent the energy saving when you consider how they are used. Not too mention the mercury that is in them.
You could argue the same for LED bulbs.
Both have higher efficiency than the incandescence bulb. Neither are 100% efficient.
(When you define efficiency as watts visible light /watt consumed)
nice information, explained briefly, tq
Light Emitting Device?? high scholarly standards, Universidad de Granada!
in other wordz, so much dissipation validates the bulb's lifespan
Fluorescent is one word not fluoro-escent with a slight pause
*Light Emitting Device.... So a lamp is a LED?*
Am I the only one having trouble with the audio?
I had real trouble so I quit. Light Emitting Device could be anything that emits light, even glow sticks.
well done
hey miss a tetris version would have been more straight forward about the heat factor and please don't hate me just consider it.
Led and LCD difference
LED light emitting diode. LCD liquid crystal display.
fun fact: the planet has only been lit up at night for 150 years, out of her 4.5 billion yea.....I mean 6000 years.
well, not quite.
if you count lightening, light emitting lifeforms, forest fire, volcanic activity etc.
And these organic freaks are not even asking to the planet if it wants to be shiny or not, jeez...
Lol nice
Thanks for very little information indeed.
' very good vedeo About LED
Maybe lost in translation butbthere us a lot wrong or at least not quite right in this video...
Overall a bad video please take ut down. Sorry
Such as?...
Light Emitting by Diode...
The graphics are very nicely illustrated.But the voice could be a bit more interesting by changing tones.It grew a bit monotonous at the similar voice pitch.otherwise,its awesome.
They said LED cost you very low electricity bill. What they don't tell you is, it cost you more on replacement and have lower lifespan. 10000 hour lifespan? The electronic controller failed first before the LED failed.
Yes. And todays sockets can't transfer the heat good enough. So lamps with inbuilt led's probably last longer if designed good.
Super
I once sat through a class by an "engineer" from China who proceeded to lecture us on LED's and video display modules. According to him, the reason outdoor LED's get dimmer as they age has nothing whatsoever to do with the weather or sunlight causing dirty or cloudy lenses, or aging and degradation of the semiconductor material inside. It is actually due to depletion of the fissionable nuclear material inside. Then he said that's how the sun works. This from the same "engineer" who claims it is impossible for these modules to get any water inside, and impossible to provide a drain hole for any trapped water. The display modules are designed without fuses or any kind of over current protection because there is no room for fuses in his warehouse. I couldn't tell if he actually believed any of this BS or if he just thought Americans were stupid enough to buy it. Mentioning this to my company's VP changed nothing.
LoL. I don't know *your* VP, I know the VP type.
The VP understands the technology much less than either you or the Chinese engineer for sure.
If it was a reasonably sized company, it's safe to say he didn't care.
Maybe you should have told the CTO.
I have had the pleasure of meeting engineers from many different countries. Some are technology freaks and some are what we called "sales engineers".
The country does not appear to be the discriminating factor.
The globe in the intro is turning backwards.
No, it does not seem to turn at all.. Only the "camera" rotates around it...
Hey it could be both...
Muy bien hecho!!
Nice
P - positive (+)
N - negative (-)
your voice is beautiful!
Thanks
Elon Musk called and said you're doing it wrong, and now your soul belongs to him....
Have a great day!