Not so long ago the light source as we know it today it didn't exist.
The world was lighted up by fires candles and gas.
However in 1879 Thomas Alva Edison developed a light bulb that was able to shine longer and brighterthan any others.
Today we can see lightbulbs everywhere.
In different shapes, sizes, limitations and power ratings.
But how does it work? What other features then just lightning can it do? What is the difference between cold whiteand warm white? This is something we are going to find out today.
The incandescent light bulb works very simply.
However, it took decades until the proper combination of all components was discovered.
In the middle of the light bulb there is a filament.
Today, the filament is made of tungsten.
When current goes through it, it is heated and starts to glow.
Let's have a demonstration.
Here we have a regular light bulb just without the glass.
We're going to connect it to the mains and see what happens.
Danger! Danger! Danger! Don't do it at home! These are live wires.
They can kill you or harm you! That is why I'm here doing it for you.
Great! Let's connect it! And.
Why this is not working? The reason is the tungsten evaporates very quickly in the presence of oxygen.
However, when it doesn't have anything to react with such as inert gas or vacuum, it will heat up and start to glow.
Eventually, it will evaporate but the process is much slower, about 1 200 hours.
Have you ever thought what was popping above people's heads before the light bulbs? Was it a candle? A Rising Sun? Maybe gears? As innovative and life-changing the light bulb is, it went through a lot of changes in order to increase its efficiency and prolongs life.
But it was not enough! Only 10% of the total energy that is used to power up the light bulb is converted into light.
The other 90% is converted into heat and increases our carbon footprint on earth.
That is why most of the developed countries are switching from incandescent light bulbs into more efficient ones.
In the United States for instance the incandescent light bulb was banned since 2017 by President Barak Obama.
In Japan, after the Tohoku earthquake in 2011, as the part of the “Setsuden” movement, citizens were asked to switch off their light bulbs and turn to LEDs.
By the way.
When you think or have a new idea, your brain is using the same amount of energy as a 20W light bulb.
Maybe that's the reason why you have it above your head.
So, what is this LED? Usually, when you think of an LED, you picture in your mind a small red plastic device with two uneven metal legs.
These small LEDs are powered by direct current.
They cannot be used for alternating current.
So, how come you just can plug it into a standard socket? LED stands for light emitting diode.
It's a small semiconductor that was especially designed to emit light when current passes through.
The LED lamp contains a few main parts.
This component is responsible for converting the mains power, which is alternative current, to regulared direct current which powers the LED array.
Some LED drivers can even deem or control the light.
In order to be efficient and work properly LEDs must stay low temperatures.
That is why a heat sink or even cooling fence in high power applications are used.
But we are not done yet! Without proper optics, the LED would be useless.
The density of the emitted light over distance has to be increased and distributed uniformly.
To do so, one or more secondary optics such as diffusers, lenses and reflectors are implemented.
Overall, LED versus incandescent wins every time.
Or does it? From the efficiency point of view, LED is up to 90% more efficient.
This means, it produces more light for the same amount of power.
How many times did you have to change the light bulb last year? Maybe the power fluctuations in the mains are destroying it? By using an LED you can forget about getting all the way up to the ceiling to change a light bulb.
And by the time you will have to change it, your son could do it for you! In other words, LED lasts on average for 30 000 of hours in comparison to only 1 200 of the regular light bulb.
And because of its efficiency, you save much more money! So if those LEDs look very promising, why not to make the change right away? The first thing that you will notice, when you go and buy a new LED, is the initial price.
It can go up to tens of dollars for highly quality LED lamps.
But, as we know you will end up paying more in the long run, if you use a regular light bulb.
The second thing, you should know is that LED lamps contain different toxic materials.
So if broken, you should avoid any direct contact.
But in fact, they are made of much stronger material than glass and the toxins can be removed if proper legislation is issued.
Another thing I have noticed is that when I go to buy jewelry, it always looks shiny in the store.
But when I expose it to regular life like halogen lamp, it doesn't look that push any longer.
So, check it out under the Sun before you buy it.
This can also influence the choice of colors at home or even present art in a different way.
Let's get back for a second to the shop when you buy a new light bulb.
If you look at the package, you can see that there is a lot of weird stuff there, like 20 Watts equals 150, there are different kinds of white, or 470 lumens, or is it dimmable or not.
To make it all easier, let's go through those terms together.
Lumens is the measure of light output and 1 lumen is approximately 1 candle light.
This means, the more lumens there are the brighter the light source.
Unlike incandescent light bulbs, LEDs use less power to produce the same amount of light output.
That is why, a 20W LED can be equal to 150W light bulb.
However, because of the lower power consumption for the same amount of light you pay much less.
The light color also plays a huge role when deciding what light bulb you should buyfor your kitchen or bedroom.
We will discuss it in details in another episode, but in short, warm light, just like the one from the halogen lamps is good for bedrooms.
On the other hand, cold blue light is better for reading.
Now you can change your light bulbs without any fear.
By the way.
How many psychologists does it taketo change a light bulb? One! If the light bulb really wants to change.
Like it or not, make sure you subscribe! The next are coming.
If you need more information read the description below and have fun!.