LED voltages - Collin's Lab Notes
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- Опубліковано 17 бер 2021
- Check out a wide array of LEDs at Adafruit:
www.adafruit.com/category/37
It turns out that LED’s color has a lot to do with it’s voltage. Who knew?
#collinslabnotes #adafruit
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I always remember increasing the voltage applied to a green LED and it starts glowing yellow/orange! The curious effect is that if you dial back the voltage, the color will stay the same and it will never be green again. And of course, if you increase it too much, you get a darkness emitting diode :P
i love to increase it until it explode..lol.
You have the D E D instead of LED 😀
or don't connect a red led to 5v like a i did :|
@@averyoldUA-camuser Going to quote you on that....! 😅✌🏼
Then it smells really bad🤢 yuck
Ohh I remembered my toys in the past powered by batteries. Like some glowing fan toys or cars with dozens of LEDs inside, when the batteries run out, the last thing can still powered on is the red LED light, all the other colors gone and yes, the blue disappear ed first cuz it needs highest voltage and the red needs the lowest voltage so they always the last one to be lit by low power batteries
The cool thing is also that LEDs change color when cold.
short, but on point.
Man, i'm so glad i stumbled upon your channel.
Very informative, thank you.
These shorts are great
your videos are always very interesting and instructive, keep it up!! 👍👏👏
This dude knows his stuff well
Colin's Lab is back?
I would certainly subscribe if it was revived.
That's awesome, I now know why the green and blue bulbs still worked on my Christmas lights. I found the corroded bulb(red) and the whole string lit up!! Thanks for the sweet knowledge!
True! I have a bunch of clear leds wich emit red, yellow, blue etc light
I guess that explains why fried so many LEDs thinking they would all work on the same voltage
They always need a current limiter. You will fry them if you don't keep the current within rated limits.
Is that why blue leds are so common in electronics? Because of their closeness to 3.3 volts?
They are the most efficient in producing light with the same amount of power as other LEDs.
That's why they are the brightest and most annoying!
Probably because it was cool when they first came out. For the longest time, blue LEDs did not exist, so when they found out how to make them, everyone jumped on the bandwagon. And they still think they're all hip when they stick blue LEDs in their products.
@@DaedalusYoung just learned this today that the blue led was the last to be invented so it was a big deal for RGB. Interesting.
InGaN green LED's also exist (the brighter type) and has similar voltage drop to blue LED. The GaAsP based green are more yellowish green and is more dim._
Fun random fact: you can’t make a white LED. It’s a blue LED with a phosphorus coating. Always :)
Or RGB like phone screens
Thats really good to know :D
I remember sticking LEDs straight onto 9 volt batteries growing up. I wonder why they failed 🤔🤔🤔
I miss actually seeing Colin in his spiffy suit!
fab video
Wow you are amazing understand for every thing bra
Thnx ❤️
An LED is basically a diode, so you can determine its forward voltage with a multimeter.
Wait what
Light emitting diode? Anyone?
And how do you do that? How do you measure "forward voltage?
@@feedmyintellect use the "diode" mode on your multimeter. However, some multimeters won't output enough voltage for an led.
Why did I not think of this????
Cool.
I remember accidentally frying an IR led,
it emitted visible light for a very short time.
and another time I fried a red laser diode.
it got very very bright very short.
after that it was only a bright led
that thing costed me ~10€
lesson learned I think...
It's like a tiny oscillator which generates very very high frequency. Just another perspective.
You mean because it emits light?
@@joefuentes2977 lol yeah. 😅 Basically it generate such high frequency waves and even transmit it.
Today i plugged in a yellow led into 7v and its color changed to orange
Don't worry, it will change to black very soon.
And your finger turned Red?
what about multiple coloured led’s?
Was I the only one that thought led colour depends on the color of the shell?
Then how do RGB LEDs work?
Arsenide?
But what about leds that change color tho
So since P =I*V could you argue that red LEDs are more power efficient at the same current?
Moreover would using reds on an LED screen save battery vs using blues?
That is just the input powet. Efficiency comes from comparing it with the amount of emitted light. Here blue ones are often better.
What about Christmas lights since they all run on the same voltage
You can make every color of led from blue with different phosphor.
What kind of led is that on the table, That square one? Does anyone know?
You can do a search on Digi-Key, look at discrete leds with a large lens size and rectangle/square lens type. The NTE318x series is close but rectangular (2368-NTE3181-ND)
Found one, DE4CGKD by Kingbright
I guess it wasn’t a good idea to put the ends of an led on a 9v battery lol
And also you shouldn't guess about those sort of things. Better to just be responsible and have proper datasheets for your components. At least if you want to be serious :)
Or start low and increase slowly like the rest of us
fun fact,
LED are great
So a "12V LED" is what exactly then?
A combination of a common LED with some external electronics to adapt the voltage.
Not exactly correct!
Cheap LED's emit whitish light, and it's lens/casing filters it to the desirable Color.
This is due to history of LED's development.
rgb leds be like
Bluetooth ayet var
So RED need lowest voltage.. BLUE drain your battery quickly.
NOPE. For a given amount of light, blue requires much less power.
And henceforth, you can make an educated guess about the wavelength-energy relationship of the electromagnetic radiation and put the cancer-5G relationship stupidity into an end.
And white LEDs like in a stripe?
White is a blue LED chip with a yellow phosphor over the top. Additive color mixing: Yellow = Red plus Green. Add Blue and you get "white".
Note it isn't really white, but our eyes cannot notice the trick.
Huh. I thought the color was from the depth of the diode's hole