What is an led light?
LED light can come in different forms for the user. But all of them has same idea. All this light use LEDs. So what is LED?
The LED is “Light Emitting Diode”, it is also called LED (Electroluminescent Diode). LED has a relatively recent history compared to other lighting sources: it began to develop in signage from the 1970s and has really spread in lighting since the 2010s.
How does an LED work?
An LED (Light Emitting Diode) is a light emitting diode which emits light when a direct current flows through it.
The LED is an opto-electronic component. It simply means that it is an electronic component capable of emitting light when traversed by an electric current. A light-emitting diode only allows electric current to pass in one direction – from the anode to the cathode (the passing direction, like a conventional diode, the reverse being the blocking direction) moreover it produces an incoherent monochromatic or polychromatic radiation. from the conversion of electrical energy when a current passes through it.
As shown in the following figure, the amount of light generated by the LED is proportional to the strength of the current flowing through it.
The LED emits an almost monochromatic light. Its color depends on the characteristics of the materials used during production (composition of the semiconductors and their doping, junction temperature, etc.). It is thus possible to scan all the colors of the visible spectrum.
In artificial indoor lighting, however, we mainly seek to approximate the color of natural light, namely white light. To obtain white light, it is necessary to combine several light sources of components. Thus, the white color can be produced either by additive mixing of red, green and blue LEDs, or by converting a blue LED by means of phosphorescent powder, according to the same principle used in fluorescent tubes. This last principle is generally used in interior lighting.
What is an LED bulb and how does it work?
All of LED bulbs use the same componentThe fluorescent light-emitting diode lamp or LED lamp. It is an electronic semiconductor component that uses light-emitting diodes for lighting.
Technical vocabulary of LED
|Lumen (Lm):||lumen measures the amount of light emitted by the bulb, i.e. the light returned.|
|Watt:||unit of measurement for electrical power.|
|Candela (cd):||the candela measures the light intensity perceived by the human eye.|
|Color temperature (K):|| The color temperature indicates the hue of the diffused color.
– Yellow / orange tint: “warm white” light (between 2,700K and 3,500K) which provides warm lighting, approaching the rendering of a candle light.
– White tint: “neutral white” light (3200 K to 5000 K), it is close to daylight.
– Bluish tint: “cold white” or industrial white light (5500 K to more than 8000 K).
|CRI (Color Rendering Index):||CRI measures the likelihood that light from a bulb will render objects true to color.
The daylight index is between 80 and 100.
How many lumens does it take to replace an incandescent bulb?
Lumens – Watt correspondence
|1521 LM||100 W|
|1055 LM||75 W|
|470 LM||40 W|
|249 LM||25 W|